Extended size report

pw_rpc2: Next gen, zero-copy async RPC with end-to-end backpressure

pw_rpc2 is built on pw_async2, pw_allocator, pw_buf, and pw_transport to provide cooperative multiplexed calls, connection-oriented transport management, and end-to-end backpressure. Because its binary size impact depends on whether a device acts as a server, a client, or both—as well as which codegen API (raw buffers or pw_protobuf message structs) and execution model (futures or C++20 coroutines) are used—a series of size reports are provided below.

Core runtime and incremental

The core size report measures the cost of adding Server and Client to an embedded system that already includes a async2::BasicDispatcher, a allocator::FirstFitAllocator, and a transport::ReliableDatagramSocket transport implementation.

The table below reports:

• Core server cost: A Server accepting connections from a transport listener, performing the opening handshake, and dispatching packets to a registered raw unary Service.

• Incremental service cost: Registering a second raw unary service on an existing server.

• Core client cost: A Client performing the opening handshake over a transport socket and invoking a raw unary RPC via a generated client.

• Incremental call cost: Invoking a second raw unary RPC method from an existing client.

• Combined server and client cost: Running both Server and Client in the same binary, which share packet framing, the opening handshake state machine, connection task management, and active call multiplexing.

Label	Segment	Delta
Size of core pw::rpc2::Server with 1 transport and 1 raw unary service	RAM NEW +8 pw::rpc2::internal::ControlLock()::lock	+8
	FLASH +328 pw::rpc2::size_report::Measure() NEW +596 pw::rpc2::internal::ConnectionTask::ReadPacketFromConnection() NEW +536 pw::rpc2::internal::ServerConnectionTask::HandleIncomingRequest() NEW +440 pw::rpc2::internal::ConnectionTask::DeliverToCall() NEW +356 pw::rpc2::internal::ServerTask::PollListeners() NEW +336 pw::rpc2::internal::HandshakeFutureBase::PendReadPacket() NEW +328 pw::rpc2::ReserveWriteFuture::Pend() NEW +312 pw::rpc2::internal::ConnectionTask::ProcessOutgoingControlPackets() NEW +300 pw::rpc2::internal::WriteFutureBase::PendWriteAndTakeCall() NEW +284 pw::rpc2::internal::ResponderHandshakeFuture::Pend() NEW +268 pw::rpc2::internal::WriteReservationBase::CommitAndTakeCall() NEW +212 pw::rpc2::internal::HandshakeFutureBase::PendWritePacket() NEW +208 pw::rpc2::internal::ServerTask::ApplyPendingListeners() NEW +192 pw::rpc2::internal::ServerTask::SubmitListener() NEW +188 pw::rpc2::ReserveWriteFuture::ReserveWriteFuture() NEW +188 pw::rpc2::internal::ConnectionTask::QueueControlPacket() NEW +188 pw::rpc2::internal::ServerTask::~ServerTask() NEW +180 pw::rpc2::internal::ServerTask::DoPend() NEW +176 pw::rpc2::internal::ConnectionTask::ConnectionTask() NEW +176 pw::rpc2::internal::InboundPacket::Decode() NEW +172 pw::rpc2::internal::ServerConnectionTask::PollHandshake() NEW +148 pw::rpc2::internal::Call::ReserveWrite() NEW +148 pw::rpc2::internal::ServerTask::SubmitClose() NEW +140 pw::rpc2::internal::ConnectionTask::CloseConnection() NEW +136 pw::rpc2::internal::HandshakePacket::Decode() NEW +134 pw::rpc2::internal::ConnectionTask::~ConnectionTask() NEW +132 pw::rpc2::internal::ServerTask::ApplyPendingServices() NEW +128 pw::rpc2::internal::Call::CloseRead() NEW +124 pw::rpc2::internal::MethodInvokerBase<>::InvokeMethod<>() NEW +124 pw::rpc2::internal::OutboundPacket::EncodeHeader() NEW +124 pw::rpc2::internal::ServerCall::DoPend() NEW +116 pw::rpc2::internal::SendControlPacketFuture::Pend() NEW +114 pw::rpc2::internal::Call::~Call() NEW +112 pw::rpc2::internal::Call::ReserveMessageSlot() NEW +110 pw::rpc2::internal::ServerCall::~ServerCall() NEW +104 pw::rpc2::ControlFuture::Pend() NEW +104 pw::rpc2::internal::Call::InitChannel() NEW +104 pw::rpc2::internal::CallHandle::ReserveOutbound() NEW +104 pw::rpc2::internal::WriteReservationBase::PayloadSpan() NEW +102 pw::rpc2::internal::SendControlPacketFuture::SendControlPacketFuture() NEW +100 pw::rpc2::internal::ServerCall::CommitEmplacedFuture() NEW +96 pw::rpc2::internal::Call::OnMessage() NEW +96 pw::rpc2::internal::ServerTask::Shutdown() NEW +92 pw::rpc2::internal::BoxedMethodFuture::Pend() NEW +92 pw::rpc2::internal::ServerCall::ServerCall() NEW +92 pw::rpc2::internal::ServerTask::Start() NEW +90 pw::rpc2::ReserveWriteFuture::Create() NEW +88 pw::rpc2::internal::ConnectionTask::DispatchPendingIngressPacket() NEW +84 pw::rpc2::internal::ConnectionTask::PendPacket() NEW +84 pw::rpc2::internal::ServerConnectionTask::ServerConnectionTask() NEW +80 pw::rpc2::internal::Call::CloseWriteOnRetire() NEW +80 pw::rpc2::internal::ServerTask::RegisterService() NEW +76 pw::rpc2::internal::Call::Call() NEW +76 pw::rpc2::internal::WriteFutureBase::PendWrite() NEW +70 pw::rpc2::internal::ConnectionTask::DoPend() NEW +68 pw::rpc2::internal::(anonymous namespace)::EncodeAndCommitHeader() NEW +68 pw::rpc2::internal::ConnectionTask::StoreWaker() NEW +68 pw::rpc2::internal::WriteReservationBase::ReleaseCall() NEW +66 pw::rpc2::internal::SerializeTypeErased<>() NEW +66 pw::rpc2::internal::WriteReservationBase::WriteReservationBase() NEW +62 pw::rpc2::internal::ServerConnectionTask::PollOpenConnection() NEW +60 pw::rpc2::internal::HandshakeFutureBase::Cancel() NEW +60 pw::rpc2::internal::ServerTask::BlockOn() NEW +56 pw::rpc2::internal::Call::NotifyIfClosed() NEW +56 pw::rpc2::internal::HandshakeFutureImpl::Complete() NEW +56 pw::rpc2::internal::InboundPacket::error() NEW +56 pw::rpc2::internal::OutboundPacket::ClientError() NEW +56 pw::rpc2::internal::OutboundPacket::ServerError() NEW +52 pw::rpc2::Service::~Service() NEW +52 pw::rpc2::internal::ConnectionTask::PendPackets() NEW +52 pw::rpc2::internal::ListenerRecord::stop_accepting() NEW +50 pw::rpc2::ReserveWriteFuture::AbandonTerminalIfPending() NEW +50 pw::rpc2::internal::HandshakeFutureImpl::operator=() NEW +48 pw::rpc2::ControlFuture::TryTakeResolved() NEW +48 pw::rpc2::internal::Call::BeginTerminalWrite() NEW +48 pw::rpc2::internal::Call::Cancel() NEW +48 pw::rpc2::internal::Call::Complete() NEW +48 pw::rpc2::internal::ConnectionTask::FinishHandshake() NEW +48 pw::rpc2::internal::HandshakePacket::Encode() NEW +48 pw::rpc2::internal::InboundPacket::method_id() NEW +48 pw::rpc2::internal::InboundPacket::service_id() NEW +48 pw::rpc2::internal::ServerConnectionTask::CleanUpCalls() NEW +46 pw::rpc2::internal::Call::OnPeerStreamEnd() NEW +46 pw::rpc2::internal::HandshakeFutureImpl::Fail() NEW +46 pw::rpc2::internal::ServerConnectionTask::~ServerConnectionTask() NEW +44 pw::rpc2::internal::Call::BeginInvocation() NEW +44 pw::rpc2::internal::Call::CloseWrite() NEW +44 pw::rpc2::internal::PacketType::FromValidatedBits() NEW +44 pw::rpc2::internal::ServerCall::Retire() NEW +44 pw::rpc2::internal::ServerConnectionTask NEW +44 pw::rpc2::internal::WriterBase::ReserveResponse() NEW +44 pw::rpc2::internal::WriterBase::WriterBase() NEW +42 pw::rpc2::internal::ServerCall::Allocate() NEW +42 pw::rpc2::internal::ServerTask::RegisterListenerBlocking() NEW +40 pw::rpc2::internal::Call::DeliverFirstPayloadForStream() NEW +40 pw::rpc2::internal::ServerCall NEW +38 pw::rpc2::UnaryWriter<>::FinishCopy() NEW +38 pw::rpc2::internal::ConnectionTask::QueueFinish() NEW +38 pw::rpc2::internal::HandshakeFutureImpl::HandshakeFutureImpl() NEW +36 pw::rpc2::ControlFuture::listener_locked() NEW +36 pw::rpc2::ControlFuture::~ControlFuture() NEW +36 pw::rpc2::WriteFuture<>::Pend() NEW +36 pw::rpc2::internal::Call::connection_task() NEW +36 pw::rpc2::internal::Call::is_closed() NEW +36 pw::rpc2::internal::CallHandle::call() NEW +36 pw::rpc2::internal::ServerTask::Close() NEW +36 pw::rpc2::internal::ServerTask::RegisterListener() NEW +36 pw::rpc2::internal::WriteReservationBase::Drop() NEW +34 pw::rpc2::internal::Call::FlushDeferredWriterDrop() NEW +34 pw::rpc2::internal::IsServerError() NEW +34 pw::rpc2::internal::MethodFutureImpl<>::~MethodFutureImpl() NEW +34 pw::rpc2::internal::ResponderHandshakeFuture::ResponderHandshakeFuture() NEW +34 pw::rpc2::internal::SendControlPacketFuture::operator=() NEW +32 pw::rpc2::internal::ConnectionTask NEW +32 pw::rpc2::internal::ConnectionTask::RegisterCall() NEW +30 pw::rpc2::Service::FindMethod() NEW +30 pw::rpc2::internal::Call::pw_recycle() NEW +30 pw::rpc2::internal::ConnectionTask::QueueError() NEW +30 pw::rpc2::internal::HandshakeFutureBase::operator=() NEW +30 pw::rpc2::internal::InboundPacket::payload_offset() NEW +30 pw::rpc2::internal::IsClientError() NEW +28 pw::rpc2::internal::BoxedMethodFuture::is_complete() NEW +28 pw::rpc2::internal::BoxedMethodFuture::operator=() NEW +28 pw::rpc2::internal::Call::QueueError() NEW +28 pw::rpc2::internal::HandshakeFutureImpl::~HandshakeFutureImpl() NEW +28 pw::rpc2::internal::MethodFutureImpl<> NEW +28 pw::rpc2::internal::ServerCall::ClearUserFuture() NEW +28 pw::rpc2::internal::ServerConnectionTask::ForceRetireAllCalls() NEW +28 pw::rpc2::internal::ServerTask::RemoveConnection() NEW +26 pw::rpc2::ReserveWriteFuture::~ReserveWriteFuture() NEW +26 pw::rpc2::internal::Call::QueueFinish() NEW +26 pw::rpc2::internal::OutboundPacket::Error() NEW +26 pw::rpc2::internal::ServerCall::FinishAndRequestRetirement() NEW +24 pw::rpc2::internal::Call::DetachFromConnection() NEW +24 pw::rpc2::internal::Call::QueueWriterDropPacket() NEW +24 pw::rpc2::internal::ConnectionTask::FindCallById() NEW +24 pw::rpc2::internal::InboundPacket::TakePayload() NEW +24 pw::rpc2::internal::ServerTask::FindService() NEW +24 pw::rpc2::internal::ServerTask::SignalControlLocked() NEW +24 pw::rpc2::internal::WriteReservationBase::~WriteReservationBase() NEW +22 pw::rpc2::ReserveWriteFuture::Response() NEW +22 pw::rpc2::WriteFuture<>::WriteFuture<>() NEW +22 pw::rpc2::internal::BoxedMethodFuture::Reset() NEW +20 pw::rpc2::ControlFuture::Pend()::{lambda()#1}::operator()() NEW +20 pw::rpc2::WriteFuture<>::~WriteFuture() NEW +20 pw::rpc2::internal::Call::OnError() NEW +20 pw::rpc2::internal::CallHandle::Reservation::~Reservation() NEW +20 pw::rpc2::internal::ServerCall::is_retirable() NEW +20 pw::rpc2::internal::ServerConnectionTask::OnClosed() NEW +20 pw::rpc2::internal::ServerTask NEW +18 pw::rpc2::internal::Call::AbandonTerminalWrite() NEW +18 pw::rpc2::internal::Call::CloseOnWriterDestroy() NEW +18 pw::rpc2::internal::Call::FinishInvocation() NEW +18 pw::rpc2::internal::ConnectionTask::Teardown() NEW +18 pw::rpc2::internal::HandshakeFutureBase::~HandshakeFutureBase() NEW +18 pw::rpc2::internal::InboundPacket::type() NEW +18 pw::rpc2::internal::WriterBase::CleanupIfUnfinished() NEW +16 pw::rpc2::internal::Call NEW +16 pw::rpc2::internal::WriteReservationBase::size() NEW +16 pw::rpc2::internal::WriterBase::~WriterBase() NEW +14 pw::rpc2::internal::MethodFutureImpl<>::Pend() NEW +14 pw::rpc2::internal::WriteReservationBase::data() NEW +12 pw::rpc2::size_report::pw_rpc2::raw::BaselineSizeReport::Service<>::kPwInternal_Methods NEW +10 pw::rpc2::UnaryWriter<>::UnaryWriter() NEW +10 pw::rpc2::internal::ConnectionTask::QueueCancel() NEW +10 pw::rpc2::internal::MethodFutureImpl<>::is_complete() NEW +10 pw::rpc2::internal::MethodFutureImpl<>::is_pendable()	+13,472
Incremental cost of adding a second raw unary service to Server	FLASH +64 pw::rpc2::size_report::Measure() +124 pw::rpc2::internal::MethodInvokerBase<>::InvokeMethod<>() NEW +12 pw::rpc2::size_report::pw_rpc2::raw::UnarySizeReport::Service<>::kPwInternal_Methods	+200
Size of core pw::rpc2::Client with 1 transport and 1 raw unary call	RAM NEW +8 pw::rpc2::internal::ControlLock()::lock	+8
	FLASH +276 pw::rpc2::size_report::Measure() NEW +596 pw::rpc2::internal::ConnectionTask::ReadPacketFromConnection() NEW +512 pw::rpc2::ClientFuture::Pend() NEW +440 pw::rpc2::internal::ConnectionTask::DeliverToCall() NEW +336 pw::rpc2::internal::HandshakeFutureBase::PendReadPacket() NEW +328 pw::rpc2::ReserveWriteFuture::Pend() NEW +312 pw::rpc2::internal::ConnectionTask::ProcessOutgoingControlPackets() NEW +300 pw::rpc2::internal::WriteFutureBase::PendWriteAndTakeCall() NEW +284 pw::rpc2::internal::InitiatorHandshakeFuture::Pend() NEW +280 pw::rpc2::internal::ReadFutureBase::PendRaw() NEW +268 pw::rpc2::internal::WriteReservationBase::CommitAndTakeCall() NEW +260 pw::rpc2::internal::UnaryFutureBase::PendRaw() NEW +220 pw::rpc2::internal::GeneratedServiceClient::StartCall() NEW +212 pw::rpc2::internal::HandshakeFutureBase::PendWritePacket() NEW +188 pw::rpc2::ReserveWriteFuture::ReserveWriteFuture() NEW +188 pw::rpc2::internal::ConnectionTask::QueueControlPacket() NEW +176 pw::rpc2::internal::ConnectionTask::ConnectionTask() NEW +176 pw::rpc2::internal::InboundPacket::Decode() NEW +148 pw::rpc2::internal::Call::ReserveWrite() NEW +140 pw::rpc2::internal::ConnectionTask::CloseConnection() NEW +136 pw::rpc2::internal::HandshakePacket::Decode() NEW +134 pw::rpc2::internal::ConnectionTask::~ConnectionTask() NEW +128 pw::rpc2::internal::Call::CloseRead() NEW +124 pw::rpc2::internal::OutboundPacket::EncodeHeader() NEW +120 pw::rpc2::size_report::(anonymous namespace)::ClientMeasurementTask::DoPend() NEW +116 pw::rpc2::internal::SendControlPacketFuture::Pend() NEW +114 pw::rpc2::internal::Call::~Call() NEW +112 pw::rpc2::internal::Call::ReserveMessageSlot() NEW +110 pw::rpc2::internal::GeneratedServiceClient::CallUnary<>() NEW +108 pw::rpc2::internal::ClientConnectionTask::RequestClose() NEW +104 pw::rpc2::internal::Call::InitChannel() NEW +104 pw::rpc2::internal::WriteReservationBase::PayloadSpan() NEW +102 pw::rpc2::internal::SendControlPacketFuture::SendControlPacketFuture() NEW +96 pw::rpc2::internal::Call::OnMessage() NEW +90 pw::rpc2::ReserveWriteFuture::Create() NEW +88 pw::rpc2::internal::ConnectionTask::DispatchPendingIngressPacket() NEW +84 pw::rpc2::internal::ConnectionTask::PendPacket() NEW +80 pw::rpc2::internal::Call::ClaimRead() NEW +76 pw::rpc2::internal::Call::Call() NEW +70 pw::rpc2::internal::ConnectionTask::DoPend() NEW +68 pw::rpc2::UnaryFuture<>::Pend() NEW +68 pw::rpc2::internal::(anonymous namespace)::EncodeAndCommitHeader() NEW +68 pw::rpc2::internal::ClientConnectionTask::ClientConnectionTask() NEW +68 pw::rpc2::internal::ConnectionTask::StoreWaker() NEW +68 pw::rpc2::internal::WriteReservationBase::ReleaseCall() NEW +66 pw::rpc2::ReserveWriteFuture::operator=() NEW +66 pw::rpc2::internal::SerializeTypeErased<>() NEW +66 pw::rpc2::internal::WriteReservationBase::WriteReservationBase() NEW +64 pw::rpc2::internal::ClientConnectionTask::OnClosed() NEW +60 pw::rpc2::internal::HandshakeFutureBase::Cancel() NEW +58 pw::rpc2::internal::HandshakeFutureImpl::HandshakeFutureImpl() NEW +56 pw::rpc2::internal::Call::NotifyIfClosed() NEW +56 pw::rpc2::internal::InboundPacket::error() NEW +56 pw::rpc2::internal::OutboundPacket::ClientError() NEW +56 pw::rpc2::internal::OutboundPacket::ServerError() NEW +54 pw::rpc2::internal::HandshakeFutureImpl::Complete() NEW +54 pw::rpc2::internal::ReadFutureBase::ClaimReadIfHasCall() NEW +52 pw::rpc2::Client::CreateCall() NEW +52 pw::rpc2::internal::ConnectionTask::PendPackets() NEW +50 pw::rpc2::ReserveWriteFuture::AbandonTerminalIfPending() NEW +50 pw::rpc2::internal::HandshakeFutureImpl::operator=() NEW +50 pw::rpc2::internal::UnaryFutureBase::UnaryFutureBase() NEW +48 pw::rpc2::internal::Call::BeginTerminalWrite() NEW +48 pw::rpc2::internal::Call::Cancel() NEW +48 pw::rpc2::internal::Call::Complete() NEW +48 pw::rpc2::internal::Call::ExpectSingleResponse() NEW +48 pw::rpc2::internal::ClientConnectionTask::NewCallId() NEW +48 pw::rpc2::internal::HandshakePacket::Encode() NEW +48 pw::rpc2::internal::ReadFutureBase::operator=() NEW +46 pw::rpc2::ClientFuture::MoveFrom() NEW +46 pw::rpc2::internal::Call::OnPeerStreamEnd() NEW +46 pw::rpc2::internal::ClientConnectionTask::~ClientConnectionTask() NEW +46 pw::rpc2::internal::HandshakeFutureImpl::Fail() NEW +46 pw::rpc2::size_report::(anonymous namespace)::ClientMeasurementTask::~ClientMeasurementTask() NEW +44 pw::rpc2::internal::Call::CloseWrite() NEW +44 pw::rpc2::internal::ClientConnectionTask::AddUserHandle() NEW +44 pw::rpc2::internal::PacketType::FromValidatedBits() NEW +44 pw::rpc2::internal::ReadFutureBase::ReadFutureBase() NEW +42 pw::rpc2::Client::close_status() NEW +42 pw::rpc2::ClientFuture::ClientFuture() NEW +42 pw::rpc2::internal::ClientConnectionTask::PollOpenConnection() NEW +38 pw::rpc2::internal::ConnectionTask::QueueFinish() NEW +36 pw::rpc2::Client::Client() NEW +36 pw::rpc2::internal::Call::connection_task() NEW +36 pw::rpc2::internal::Call::is_closed() NEW +36 pw::rpc2::internal::CallHandle::call() NEW +36 pw::rpc2::internal::WriteReservationBase::Drop() NEW +34 pw::rpc2::internal::Call::FlushDeferredWriterDrop() NEW +34 pw::rpc2::internal::InitiatorHandshakeFuture::InitiatorHandshakeFuture() NEW +34 pw::rpc2::internal::IsServerError() NEW +34 pw::rpc2::internal::SendControlPacketFuture::operator=() NEW +32 pw::rpc2::Client::is_open() NEW +32 pw::rpc2::internal::ClientConnectionTask NEW +32 pw::rpc2::internal::ClientConnectionTask::HandleIncomingRequest() NEW +32 pw::rpc2::internal::ConnectionTask NEW +32 pw::rpc2::internal::ConnectionTask::RegisterCall() NEW +32 pw::rpc2::internal::IsClientError() NEW +30 pw::rpc2::internal::Call::pw_recycle() NEW +30 pw::rpc2::internal::ClientCall::Create() NEW +30 pw::rpc2::internal::ClientConnectionTask::ReleaseUserHandle() NEW +30 pw::rpc2::internal::ConnectionTask::QueueError() NEW +30 pw::rpc2::internal::HandshakeFutureBase::HandshakeFutureBase() NEW +30 pw::rpc2::internal::HandshakeFutureBase::operator=() NEW +30 pw::rpc2::internal::InboundPacket::payload_offset() NEW +28 pw::rpc2::internal::Call::QueueError() NEW +28 pw::rpc2::internal::HandshakeFutureImpl::~HandshakeFutureImpl() NEW +28 pw::rpc2::internal::ResponseFutureBase::ResponseFutureBase() NEW +26 pw::rpc2::ReserveWriteFuture::~ReserveWriteFuture() NEW +26 pw::rpc2::internal::Call::DetachFromConnection() NEW +26 pw::rpc2::internal::Call::QueueFinish() NEW +26 pw::rpc2::internal::ClientConnectionTask::CreateCall() NEW +26 pw::rpc2::internal::OutboundPacket::Error() NEW +24 pw::rpc2::ReserveWriteFuture::StartStream() NEW +24 pw::rpc2::ReserveWriteFuture::StartUnary() NEW +24 pw::rpc2::internal::Call::QueueWriterDropPacket() NEW +24 pw::rpc2::internal::ConnectionTask::FindCallById() NEW +24 pw::rpc2::internal::InboundPacket::TakePayload() NEW +24 pw::rpc2::internal::ReadFutureBase::~ReadFutureBase() NEW +24 pw::rpc2::internal::WriteReservationBase::~WriteReservationBase() NEW +22 pw::rpc2::UnaryFuture<>::UnaryFuture<>() NEW +22 pw::rpc2::internal::Call::CloseReadOnReaderDestroy() NEW +22 pw::rpc2::internal::Call::ReleaseRead() NEW +20 pw::rpc2::Client::ReleaseConnection() NEW +20 pw::rpc2::internal::Call::OnError() NEW +20 pw::rpc2::internal::ClientCall::ClientCall() NEW +20 pw::rpc2::internal::UnaryFutureBase::~UnaryFutureBase() NEW +20 pw::rpc2::size_report::(anonymous namespace)::ClientMeasurementTask NEW +18 pw::rpc2::Client::AddConnectionHandle() NEW +18 pw::rpc2::Client::~Client() NEW +18 pw::rpc2::UnaryFuture<>::~UnaryFuture() NEW +18 pw::rpc2::internal::Call::AbandonTerminalWrite() NEW +18 pw::rpc2::internal::Call::max_write_size_bytes() NEW +18 pw::rpc2::internal::ConnectionTask::Teardown() NEW +18 pw::rpc2::internal::GeneratedServiceClient::StartReservedCall() NEW +18 pw::rpc2::internal::HandshakeFutureBase::~HandshakeFutureBase() NEW +18 pw::rpc2::internal::ReadFutureBase::ReleaseRead() NEW +16 pw::rpc2::internal::Call NEW +16 pw::rpc2::internal::ClientCall NEW +16 pw::rpc2::internal::CopyMethod<>::Copy() NEW +16 pw::rpc2::internal::InboundPacket::type() NEW +16 pw::rpc2::internal::WriteReservationBase::size() NEW +16 pw::rpc2::size_report::pw_rpc2::raw::BaselineSizeReport::Client::Client() NEW +14 pw::rpc2::Client::ReleaseConnectionIfHeld() NEW +14 pw::rpc2::internal::ClientCall::~ClientCall() NEW +14 pw::rpc2::internal::WriteReservationBase::data() NEW +10 pw::rpc2::ReserveWriteFuture::Failed() NEW +10 pw::rpc2::internal::ConnectionTask::QueueCancel()	+11,534
Incremental cost of making a second raw unary call in Client	FLASH +84 pw::rpc2::size_report::(anonymous namespace)::ClientMeasurementTask::DoPend() +16 pw::rpc2::internal::CopyMethod<>::Copy() NEW +16 pw::rpc2::size_report::pw_rpc2::raw::UnarySizeReport::Client::Client()	+116
Size of combined pw::rpc2::Server and pw::rpc2::Client (1 transport, 1 raw unary service, 1 raw unary call)	RAM NEW +8 pw::rpc2::internal::ControlLock()::lock	+8
	FLASH +532 pw::rpc2::size_report::Measure() NEW +596 pw::rpc2::internal::ConnectionTask::ReadPacketFromConnection() NEW +536 pw::rpc2::internal::ServerConnectionTask::HandleIncomingRequest() NEW +512 pw::rpc2::ClientFuture::Pend() NEW +440 pw::rpc2::internal::ConnectionTask::DeliverToCall() NEW +356 pw::rpc2::internal::ServerTask::PollListeners() NEW +352 pw::rpc2::internal::ConnectionTask::ConnectionTask() NEW +336 pw::rpc2::internal::HandshakeFutureBase::PendReadPacket() NEW +328 pw::rpc2::ReserveWriteFuture::Pend() NEW +312 pw::rpc2::internal::ConnectionTask::ProcessOutgoingControlPackets() NEW +300 pw::rpc2::internal::WriteFutureBase::PendWriteAndTakeCall() NEW +284 pw::rpc2::internal::InitiatorHandshakeFuture::Pend() NEW +284 pw::rpc2::internal::ResponderHandshakeFuture::Pend() NEW +280 pw::rpc2::internal::ReadFutureBase::PendRaw() NEW +268 pw::rpc2::internal::WriteReservationBase::CommitAndTakeCall() NEW +260 pw::rpc2::internal::UnaryFutureBase::PendRaw() NEW +220 pw::rpc2::internal::GeneratedServiceClient::StartCall() NEW +212 pw::rpc2::internal::HandshakeFutureBase::PendWritePacket() NEW +208 pw::rpc2::internal::ServerTask::ApplyPendingListeners() NEW +192 pw::rpc2::internal::ServerTask::SubmitListener() NEW +188 pw::rpc2::ReserveWriteFuture::ReserveWriteFuture() NEW +188 pw::rpc2::internal::ConnectionTask::QueueControlPacket() NEW +188 pw::rpc2::internal::ServerTask::~ServerTask() NEW +180 pw::rpc2::internal::ServerTask::DoPend() NEW +176 pw::rpc2::internal::InboundPacket::Decode() NEW +172 pw::rpc2::internal::ServerConnectionTask::PollHandshake() NEW +148 pw::rpc2::internal::Call::ReserveWrite() NEW +148 pw::rpc2::internal::ServerTask::SubmitClose() NEW +140 pw::rpc2::internal::ConnectionTask::CloseConnection() NEW +136 pw::rpc2::internal::HandshakePacket::Decode() NEW +134 pw::rpc2::internal::ConnectionTask::~ConnectionTask() NEW +132 pw::rpc2::internal::ServerTask::ApplyPendingServices() NEW +128 pw::rpc2::internal::Call::CloseRead() NEW +124 pw::rpc2::internal::MethodInvokerBase<>::InvokeMethod<>() NEW +124 pw::rpc2::internal::OutboundPacket::EncodeHeader() NEW +124 pw::rpc2::internal::ServerCall::DoPend() NEW +120 pw::rpc2::size_report::(anonymous namespace)::ClientMeasurementTask::DoPend() NEW +116 pw::rpc2::internal::SendControlPacketFuture::Pend() NEW +114 pw::rpc2::internal::Call::~Call() NEW +112 pw::rpc2::internal::Call::ReserveMessageSlot() NEW +110 pw::rpc2::internal::GeneratedServiceClient::CallUnary<>() NEW +110 pw::rpc2::internal::ServerCall::~ServerCall() NEW +108 pw::rpc2::internal::ClientConnectionTask::RequestClose() NEW +104 pw::rpc2::ControlFuture::Pend() NEW +104 pw::rpc2::internal::Call::InitChannel() NEW +104 pw::rpc2::internal::CallHandle::ReserveOutbound() NEW +104 pw::rpc2::internal::WriteReservationBase::PayloadSpan() NEW +102 pw::rpc2::internal::SendControlPacketFuture::SendControlPacketFuture() NEW +100 pw::rpc2::internal::ServerCall::CommitEmplacedFuture() NEW +96 pw::rpc2::internal::Call::OnMessage() NEW +96 pw::rpc2::internal::ServerTask::Shutdown() NEW +92 pw::rpc2::internal::BoxedMethodFuture::Pend() NEW +92 pw::rpc2::internal::ServerCall::ServerCall() NEW +92 pw::rpc2::internal::ServerTask::Start() NEW +90 pw::rpc2::ReserveWriteFuture::Create() NEW +88 pw::rpc2::internal::ConnectionTask::DispatchPendingIngressPacket() NEW +84 pw::rpc2::internal::ConnectionTask::PendPacket() NEW +84 pw::rpc2::internal::ServerConnectionTask::ServerConnectionTask() NEW +80 pw::rpc2::internal::Call::ClaimRead() NEW +80 pw::rpc2::internal::Call::CloseWriteOnRetire() NEW +80 pw::rpc2::internal::ServerTask::RegisterService() NEW +76 pw::rpc2::internal::Call::Call() NEW +76 pw::rpc2::internal::WriteFutureBase::PendWrite() NEW +70 pw::rpc2::internal::ConnectionTask::DoPend() NEW +68 pw::rpc2::UnaryFuture<>::Pend() NEW +68 pw::rpc2::internal::(anonymous namespace)::EncodeAndCommitHeader() NEW +68 pw::rpc2::internal::ClientConnectionTask::ClientConnectionTask() NEW +68 pw::rpc2::internal::ConnectionTask::StoreWaker() NEW +68 pw::rpc2::internal::WriteReservationBase::ReleaseCall() NEW +66 pw::rpc2::ReserveWriteFuture::operator=() NEW +66 pw::rpc2::internal::SerializeTypeErased<>() NEW +66 pw::rpc2::internal::WriteReservationBase::WriteReservationBase() NEW +64 pw::rpc2::internal::ClientConnectionTask::OnClosed() NEW +60 pw::rpc2::internal::HandshakeFutureBase::Cancel() NEW +60 pw::rpc2::internal::ServerConnectionTask::PollOpenConnection() NEW +60 pw::rpc2::internal::ServerTask::BlockOn() NEW +58 pw::rpc2::internal::HandshakeFutureImpl::HandshakeFutureImpl() NEW +56 pw::rpc2::internal::Call::NotifyIfClosed() NEW +56 pw::rpc2::internal::HandshakeFutureImpl::Complete() NEW +56 pw::rpc2::internal::InboundPacket::error() NEW +56 pw::rpc2::internal::OutboundPacket::ClientError() NEW +56 pw::rpc2::internal::OutboundPacket::ServerError() NEW +54 pw::rpc2::internal::ReadFutureBase::ClaimReadIfHasCall() NEW +52 pw::rpc2::Client::CreateCall() NEW +52 pw::rpc2::Service::~Service() NEW +52 pw::rpc2::internal::ConnectionTask::PendPackets() NEW +52 pw::rpc2::internal::ListenerRecord::stop_accepting() NEW +50 pw::rpc2::ReserveWriteFuture::AbandonTerminalIfPending() NEW +50 pw::rpc2::internal::HandshakeFutureImpl::operator=() NEW +50 pw::rpc2::internal::UnaryFutureBase::UnaryFutureBase() NEW +48 pw::rpc2::ControlFuture::TryTakeResolved() NEW +48 pw::rpc2::internal::Call::BeginTerminalWrite() NEW +48 pw::rpc2::internal::Call::Cancel() NEW +48 pw::rpc2::internal::Call::Complete() NEW +48 pw::rpc2::internal::Call::ExpectSingleResponse() NEW +48 pw::rpc2::internal::ClientConnectionTask::NewCallId() NEW +48 pw::rpc2::internal::ConnectionTask::FinishHandshake() NEW +48 pw::rpc2::internal::HandshakePacket::Encode() NEW +48 pw::rpc2::internal::InboundPacket::method_id() NEW +48 pw::rpc2::internal::InboundPacket::service_id() NEW +48 pw::rpc2::internal::ReadFutureBase::operator=() NEW +48 pw::rpc2::internal::ServerConnectionTask::CleanUpCalls() NEW +46 pw::rpc2::ClientFuture::MoveFrom() NEW +46 pw::rpc2::internal::Call::OnPeerStreamEnd() NEW +46 pw::rpc2::internal::ClientConnectionTask::~ClientConnectionTask() NEW +46 pw::rpc2::internal::HandshakeFutureImpl::Fail() NEW +46 pw::rpc2::internal::ServerConnectionTask::~ServerConnectionTask() NEW +46 pw::rpc2::size_report::(anonymous namespace)::ClientMeasurementTask::~ClientMeasurementTask() NEW +44 pw::rpc2::internal::Call::BeginInvocation() NEW +44 pw::rpc2::internal::Call::CloseWrite() NEW +44 pw::rpc2::internal::ClientConnectionTask::AddUserHandle() NEW +44 pw::rpc2::internal::PacketType::FromValidatedBits() NEW +44 pw::rpc2::internal::ReadFutureBase::ReadFutureBase() NEW +44 pw::rpc2::internal::ServerCall::Retire() NEW +44 pw::rpc2::internal::WriterBase::ReserveResponse() NEW +44 pw::rpc2::internal::WriterBase::WriterBase() NEW +42 pw::rpc2::Client::close_status() NEW +42 pw::rpc2::ClientFuture::ClientFuture() NEW +42 pw::rpc2::internal::ClientConnectionTask::PollOpenConnection() NEW +42 pw::rpc2::internal::ServerCall::Allocate() NEW +42 pw::rpc2::internal::ServerTask::RegisterListenerBlocking() NEW +40 pw::rpc2::internal::Call::DeliverFirstPayloadForStream() NEW +40 pw::rpc2::internal::ServerCall NEW +38 pw::rpc2::UnaryWriter<>::FinishCopy() NEW +38 pw::rpc2::internal::ConnectionTask::QueueFinish() NEW +36 pw::rpc2::Client::Client() NEW +36 pw::rpc2::ControlFuture::listener_locked() NEW +36 pw::rpc2::ControlFuture::~ControlFuture() NEW +36 pw::rpc2::WriteFuture<>::Pend() NEW +36 pw::rpc2::internal::Call::connection_task() NEW +36 pw::rpc2::internal::Call::is_closed() NEW +36 pw::rpc2::internal::CallHandle::call() NEW +36 pw::rpc2::internal::ServerTask::Close() NEW +36 pw::rpc2::internal::ServerTask::RegisterListener() NEW +36 pw::rpc2::internal::WriteReservationBase::Drop() NEW +34 pw::rpc2::internal::Call::FlushDeferredWriterDrop() NEW +34 pw::rpc2::internal::InitiatorHandshakeFuture::InitiatorHandshakeFuture() NEW +34 pw::rpc2::internal::IsServerError() NEW +34 pw::rpc2::internal::MethodFutureImpl<>::~MethodFutureImpl() NEW +34 pw::rpc2::internal::ResponderHandshakeFuture::ResponderHandshakeFuture() NEW +34 pw::rpc2::internal::SendControlPacketFuture::operator=() NEW +32 pw::rpc2::Client::is_open() NEW +32 pw::rpc2::Service::FindMethod() NEW +32 pw::rpc2::internal::ClientConnectionTask NEW +32 pw::rpc2::internal::ClientConnectionTask::HandleIncomingRequest() NEW +32 pw::rpc2::internal::ConnectionTask NEW +32 pw::rpc2::internal::ConnectionTask::RegisterCall() NEW +32 pw::rpc2::internal::ServerConnectionTask NEW +30 pw::rpc2::internal::Call::pw_recycle() NEW +30 pw::rpc2::internal::ClientCall::Create() NEW +30 pw::rpc2::internal::ClientConnectionTask::ReleaseUserHandle() NEW +30 pw::rpc2::internal::ConnectionTask::QueueError() NEW +30 pw::rpc2::internal::HandshakeFutureBase::HandshakeFutureBase() NEW +30 pw::rpc2::internal::HandshakeFutureBase::operator=() NEW +30 pw::rpc2::internal::InboundPacket::payload_offset() NEW +30 pw::rpc2::internal::IsClientError() NEW +28 pw::rpc2::internal::BoxedMethodFuture::is_complete() NEW +28 pw::rpc2::internal::BoxedMethodFuture::operator=() NEW +28 pw::rpc2::internal::Call::QueueError() NEW +28 pw::rpc2::internal::HandshakeFutureImpl::~HandshakeFutureImpl() NEW +28 pw::rpc2::internal::MethodFutureImpl<> NEW +28 pw::rpc2::internal::ResponseFutureBase::ResponseFutureBase() NEW +28 pw::rpc2::internal::ServerCall::ClearUserFuture() NEW +28 pw::rpc2::internal::ServerConnectionTask::ForceRetireAllCalls() NEW +28 pw::rpc2::internal::ServerTask::RemoveConnection() NEW +26 pw::rpc2::ReserveWriteFuture::~ReserveWriteFuture() NEW +26 pw::rpc2::internal::Call::DetachFromConnection() NEW +26 pw::rpc2::internal::Call::QueueFinish() NEW +26 pw::rpc2::internal::ClientConnectionTask::CreateCall() NEW +26 pw::rpc2::internal::OutboundPacket::Error() NEW +26 pw::rpc2::internal::ServerCall::FinishAndRequestRetirement() NEW +24 pw::rpc2::ReserveWriteFuture::StartStream() NEW +24 pw::rpc2::ReserveWriteFuture::StartUnary() NEW +24 pw::rpc2::internal::Call::QueueWriterDropPacket() NEW +24 pw::rpc2::internal::ConnectionTask::FindCallById() NEW +24 pw::rpc2::internal::InboundPacket::TakePayload() NEW +24 pw::rpc2::internal::ReadFutureBase::~ReadFutureBase() NEW +24 pw::rpc2::internal::ServerTask::FindService() NEW +24 pw::rpc2::internal::ServerTask::SignalControlLocked() NEW +24 pw::rpc2::internal::WriteReservationBase::~WriteReservationBase() NEW +22 pw::rpc2::ReserveWriteFuture::Response() NEW +22 pw::rpc2::UnaryFuture<>::UnaryFuture<>() NEW +22 pw::rpc2::WriteFuture<>::WriteFuture<>() NEW +22 pw::rpc2::internal::BoxedMethodFuture::Reset() NEW +22 pw::rpc2::internal::Call::CloseReadOnReaderDestroy() NEW +22 pw::rpc2::internal::Call::ReleaseRead() NEW +20 pw::rpc2::Client::ReleaseConnection() NEW +20 pw::rpc2::ControlFuture::Pend()::{lambda()#1}::operator()() NEW +20 pw::rpc2::internal::Call::OnError() NEW +20 pw::rpc2::internal::CallHandle::Reservation::~Reservation() NEW +20 pw::rpc2::internal::ClientCall::ClientCall() NEW +20 pw::rpc2::internal::ServerCall::is_retirable() NEW +20 pw::rpc2::internal::ServerConnectionTask::OnClosed() NEW +20 pw::rpc2::internal::ServerTask NEW +20 pw::rpc2::internal::UnaryFutureBase::~UnaryFutureBase() NEW +20 pw::rpc2::size_report::(anonymous namespace)::ClientMeasurementTask NEW +18 pw::rpc2::Client::AddConnectionHandle() NEW +18 pw::rpc2::Client::~Client() NEW +18 pw::rpc2::UnaryFuture<>::~UnaryFuture() NEW +18 pw::rpc2::WriteFuture<>::~WriteFuture() NEW +18 pw::rpc2::internal::Call::AbandonTerminalWrite() NEW +18 pw::rpc2::internal::Call::CloseOnWriterDestroy() NEW +18 pw::rpc2::internal::Call::FinishInvocation() NEW +18 pw::rpc2::internal::Call::max_write_size_bytes() NEW +18 pw::rpc2::internal::ConnectionTask::Teardown() NEW +18 pw::rpc2::internal::GeneratedServiceClient::StartReservedCall() NEW +18 pw::rpc2::internal::HandshakeFutureBase::~HandshakeFutureBase() NEW +18 pw::rpc2::internal::ReadFutureBase::ReleaseRead() NEW +18 pw::rpc2::internal::WriterBase::CleanupIfUnfinished() NEW +16 pw::rpc2::internal::Call NEW +16 pw::rpc2::internal::ClientCall NEW +16 pw::rpc2::internal::CopyMethod<>::Copy() NEW +16 pw::rpc2::internal::InboundPacket::type() NEW +16 pw::rpc2::internal::WriteReservationBase::size() NEW +16 pw::rpc2::internal::WriterBase::~WriterBase() NEW +16 pw::rpc2::size_report::pw_rpc2::raw::BaselineSizeReport::Client::Client() NEW +14 pw::rpc2::Client::ReleaseConnectionIfHeld() NEW +14 pw::rpc2::internal::ClientCall::~ClientCall() NEW +14 pw::rpc2::internal::MethodFutureImpl<>::Pend() NEW +14 pw::rpc2::internal::WriteReservationBase::data() NEW +12 pw::rpc2::size_report::pw_rpc2::raw::BaselineSizeReport::Service<>::kPwInternal_Methods NEW +10 pw::rpc2::ReserveWriteFuture::Failed() NEW +10 pw::rpc2::UnaryWriter<>::UnaryWriter() NEW +10 pw::rpc2::internal::ConnectionTask::QueueCancel() NEW +10 pw::rpc2::internal::MethodFutureImpl<>::is_complete() NEW +10 pw::rpc2::internal::MethodFutureImpl<>::is_pendable()	+17,472

Note

pw_rpc2 allocates per-connection and per-call state dynamically from the configured pw::Allocator while connections and RPCs are active, freeing that memory as soon as calls and connections close. The static RAM delta reflects only the global control spinlock.

Service and client codegen costs

pw_rpc2 supports two protobuf codegen backends and two asynchronous programming models:

• Raw RPCs (raw_rpc2_proto_library): Pass zero-copy pw::ConstBuf payloads directly to and from the transport without linking a protobuf encoder or decoder.

• PWPB RPCs (pwpb_rpc2_proto_library): Automatically serialize and deserialize pw_protobuf Message structs into reserved transport buffers.

• Manual futures vs. C++20 coroutines: Services can implement RPCs either as hand-written <Method>Future state machines or as pw::async2::Coro<void> coroutines.

The codegen comparisons below use the following UnarySizeReport (single unary RPC) and SizeReport (all four RPC types: unary, server streaming, client streaming, and bidirectional streaming) service definitions:

message SizeReportMessage {
  uint32 value = 1;
}

service UnarySizeReport {
  rpc MeasureUnary(SizeReportMessage) returns (SizeReportMessage);
}

service SizeReport {
  rpc MeasureUnary(SizeReportMessage) returns (SizeReportMessage);
  rpc MeasureServerStream(SizeReportMessage) returns (stream SizeReportMessage);
  rpc MeasureClientStream(stream SizeReportMessage) returns (SizeReportMessage);
  rpc MeasureBidiStream(stream SizeReportMessage)
      returns (stream SizeReportMessage);
}

Generated service comparison

The following table breaks out the one-time cost of pw_protobuf table-based Message serialization and pw_rpc2 PWPB helpers separately from the incremental cost of adding a generated service over the core server baseline (see pw_rpc2/size_report/service_codegen_size_report.cc for the service implementations):

1. One-time ``pw_protobuf`` table encoder/decoder and ``pw_rpc2`` PWPB serialization: One-time cost of linking pw::protobuf::StreamEncoder, pw::protobuf::StreamDecoder, and pw_rpc2 PWPB serialization helpers when using pwpb RPCs (not needed for raw RPCs or if already linked elsewhere in the binary).

2. Single unary RPC service (UnarySizeReport::Service): Incremental cost of adding a 1-method unary service in raw vs. pwpb (with futures or C++20 coroutines).

3. Full 4-method service (SizeReport::Service): Incremental cost of adding all four RPC types (including streaming Reader and Writer support) in raw vs. pwpb (with futures or C++20 coroutines).

Label	Segment	Delta
One-time pw_protobuf table encoder/decoder and pw_rpc2 PWPB serialization	FLASH +8 pw::rpc2::size_report::Measure() +52 pw::protobuf::FieldKey::FieldKey() +112 pw::protobuf::StreamEncoder::StreamEncoder() NEW +1,324 pw::protobuf::StreamEncoder::Write() NEW +956 pw::protobuf::StreamDecoder::Read() NEW +514 pw::protobuf::StreamEncoder::WriteGenericPackedVarints<>() NEW +252 pw::protobuf::StreamDecoder::ReadOneVarint() NEW +224 pw::protobuf::StreamDecoder::ReadFieldKey() NEW +196 pw::protobuf::StreamEncoder::WritePackedFixed() NEW +188 pw::protobuf::StreamDecoder::ReadPackedVarintField() NEW +182 pw::protobuf::StreamDecoder::ReadRepeatedVarintField<>() NEW +180 pw::protobuf::StreamDecoder::SkipField() NEW +180 pw::protobuf::StreamEncoder::GetNestedScratchBuffer() NEW +176 pw::protobuf::StreamDecoder::ReadStringOrBytesField<>() NEW +176 pw::protobuf::StreamEncoder::GetNestedEncoder() NEW +148 pw::protobuf::StreamDecoder::StreamDecoder() NEW +114 pw::protobuf::StreamDecoder::ReadRepeatedFixedField<>() NEW +112 pw::protobuf::StreamDecoder::ReadPackedFixedField() NEW +108 pw::protobuf::StreamDecoder::Next() NEW +108 pw::rpc2::internal::PwpbEncodedSizeBytes() NEW +104 pw::protobuf::StreamDecoder::CloseNestedDecoder() NEW +104 pw::protobuf::StreamDecoder::ReadVarintField() NEW +100 pw::protobuf::StreamDecoder::ReadDelimitedField() NEW +100 pw::protobuf::StreamDecoder::ReadFixedField() NEW +96 pw::protobuf::StreamDecoder::CheckOkToRead() NEW +92 pw::rpc2::internal::PwpbEncode() NEW +90 pw::protobuf::StreamDecoder::ReadRepeatedVarintFieldGeneric() NEW +88 pw::protobuf::StreamDecoder::GetNestedDecoder() NEW +86 pw::protobuf::StreamDecoder::ReadRepeatedFixedFieldGeneric() NEW +84 pw::protobuf::FieldKey::IsValidKey() NEW +84 pw::protobuf::StreamEncoder::ResetOneOfCallbacks() NEW +84 pw::rpc2::internal::PwpbDecode() NEW +80 pw::protobuf::StreamEncoder::WriteFixed() NEW +76 pw::protobuf::StreamDecoder::Advance() NEW +76 pw::protobuf::StreamDecoder::~StreamDecoder() NEW +72 pw::rpc2::size_report::(anonymous namespace)::ExercisePwpbTableEncoderDecoder() NEW +48 pw::protobuf::StreamEncoder::WritePackedVarints<>() NEW +44 pw::protobuf::OneOf<>::Decode() NEW +42 pw::protobuf::StreamEncoder::WriteStringOrBytes<>() NEW +36 pw::protobuf::OneOf<>::Encode() NEW +16 pw::rpc2::size_report::pwpb::SizeReportMessage::_kMessageFields NEW +8 pw::rpc2::size_report::pwpb::SizeReportMessage::kMessageFields	+6,920
Incremental cost of generated raw::UnarySizeReport::Service (1 unary RPC) with futures	FLASH +64 pw::rpc2::size_report::Measure() +124 pw::rpc2::internal::MethodInvokerBase<>::InvokeMethod<>() NEW +12 pw::rpc2::size_report::pw_rpc2::raw::UnarySizeReport::Service<>::kPwInternal_Methods	+200
Incremental cost of generated pwpb::UnarySizeReport::Service (1 unary RPC) with futures	FLASH +60 pw::rpc2::size_report::Measure() +140 pw::rpc2::internal::MethodInvokerBase<>::InvokeMethod<>() +52 pw::rpc2::internal::SerializeTypeErased<>() +20 pw::rpc2::WriteFuture<>::Pend() +34 pw::rpc2::internal::MethodFutureImpl<>::~MethodFutureImpl() +28 pw::rpc2::internal::MethodFutureImpl<> +14 pw::rpc2::WriteFuture<>::WriteFuture<>() +14 pw::rpc2::internal::MethodFutureImpl<>::Pend() +12 pw::rpc2::UnaryWriter<>::UnaryWriter() +10 pw::rpc2::internal::MethodFutureImpl<>::is_complete() +10 pw::rpc2::internal::MethodFutureImpl<>::is_pendable() NEW +56 pw::rpc2::UnaryWriter<>::Finish<>() NEW +52 pw::rpc2::internal::PwpbSerde<>::Deserialize<>() NEW +24 pw::rpc2::internal::WriterBase::payload_limit() NEW +20 pw::rpc2::internal::PwpbSerde<>::Serialize<>() NEW +18 pw::rpc2::internal::Call::max_write_size_bytes() NEW +18 pw::rpc2::internal::PwpbSerializer<>::ReservationSize<>() NEW +16 pw::rpc2::internal::PwpbSerde<>::EncodedSizeBytes<>() NEW +12 pw::rpc2::size_report::pw_rpc2::pwpb::UnarySizeReport::Service<>::kPwInternal_Methods	+610
Incremental cost of generated pwpb::UnarySizeReport::Service (1 unary RPC) with C++20 coroutines	FLASH +60 pw::rpc2::size_report::Measure() +144 pw::rpc2::internal::MethodInvokerBase<>::InvokeMethod<>() +52 pw::rpc2::internal::SerializeTypeErased<>() +20 pw::rpc2::WriteFuture<>::Pend() +34 pw::rpc2::internal::MethodFutureImpl<>::~MethodFutureImpl() +28 pw::rpc2::internal::MethodFutureImpl<> +14 pw::rpc2::WriteFuture<>::WriteFuture<>() +62 pw::rpc2::internal::MethodFutureImpl<>::Pend() +10 pw::rpc2::UnaryWriter<>::UnaryWriter() +10 pw::rpc2::internal::MethodFutureImpl<>::is_complete() +10 pw::rpc2::internal::MethodFutureImpl<>::is_pendable() NEW +224 pw::rpc2::size_report::(anonymous namespace)::PwpbUnaryCoroService::MeasureUnary() NEW +56 pw::rpc2::UnaryWriter<>::Finish<>() NEW +52 pw::rpc2::internal::PwpbSerde<>::Deserialize<>() NEW +24 pw::rpc2::internal::WriterBase::payload_limit() NEW +20 pw::rpc2::internal::PwpbSerde<>::Serialize<>() NEW +20 pw::rpc2::internal::PwpbSerializer<>::ReservationSize<>() NEW +18 pw::rpc2::internal::Call::max_write_size_bytes() NEW +16 pw::rpc2::internal::PwpbSerde<>::EncodedSizeBytes<>() NEW +14 pw::rpc2::WriteFuture<>::WriteFuture() NEW +12 pw::rpc2::size_report::pw_rpc2::pwpb::UnarySizeReport::Service<>::kPwInternal_Methods	+900
Incremental cost of generated raw::SizeReport::Service (all 4 RPC types) with futures	FLASH +64 pw::rpc2::size_report::Measure() +56 pw::rpc2::ReserveWriteFuture::ReserveWriteFuture() +636 pw::rpc2::internal::MethodInvokerBase<>::InvokeMethod<>() +12 pw::rpc2::WriteFuture<>::Pend() +172 pw::rpc2::internal::MethodFutureImpl<>::~MethodFutureImpl() +84 pw::rpc2::internal::MethodFutureImpl<> +2 pw::rpc2::internal::Call::DetachFromConnection() +666 pw::rpc2::internal::MethodFutureImpl<>::Pend() +32 pw::rpc2::internal::MethodFutureImpl<>::is_complete() +48 pw::rpc2::internal::MethodFutureImpl<>::is_pendable() NEW +280 pw::rpc2::internal::ReadFutureBase::PendRaw() NEW +80 pw::rpc2::internal::Call::ClaimRead() NEW +66 pw::rpc2::ReserveWriteFuture::operator=() NEW +52 pw::rpc2::internal::ReadFutureBase::ClaimReadIfHasCall() NEW +48 pw::rpc2::internal::ReadFutureBase::operator=() NEW +48 pw::rpc2::internal::WriterBase::ReserveMessage() NEW +48 pw::rpc2::internal::WriterBase::ReserveStreamEnd() NEW +48 pw::rpc2::size_report::pw_rpc2::raw::SizeReport::Service<>::kPwInternal_Methods NEW +42 pw::rpc2::internal::ReadFutureBase::ReadFutureBase() NEW +38 pw::rpc2::Writer<>::WriteCopy() NEW +32 pw::rpc2::Writer<>::Finish() NEW +28 pw::rpc2::ReserveWriteFuture::Finish() NEW +28 pw::rpc2::ReserveWriteFuture::Message() NEW +26 pw::rpc2::WriteFuture<>::operator=() NEW +24 pw::rpc2::internal::ReadFutureBase::~ReadFutureBase() NEW +22 pw::rpc2::internal::Call::CloseReadOnReaderDestroy() NEW +22 pw::rpc2::internal::Call::ReleaseRead() NEW +18 pw::rpc2::WriteFuture<>::WriteFuture() NEW +18 pw::rpc2::internal::ReadFutureBase::ReleaseRead() NEW +18 pw::rpc2::internal::ReaderBase::CloseReadIfHasCall() NEW +16 pw::rpc2::internal::ReaderBase::~ReaderBase() NEW +10 pw::rpc2::Writer<>::Writer()	+2,784
Incremental cost of generated pwpb::SizeReport::Service (all 4 RPC types) with futures	FLASH +64 pw::rpc2::size_report::Measure() +56 pw::rpc2::ReserveWriteFuture::ReserveWriteFuture() +624 pw::rpc2::internal::MethodInvokerBase<>::InvokeMethod<>() +52 pw::rpc2::internal::SerializeTypeErased<>() +32 pw::rpc2::WriteFuture<>::Pend() +190 pw::rpc2::internal::MethodFutureImpl<>::~MethodFutureImpl() +112 pw::rpc2::internal::MethodFutureImpl<> +2 pw::rpc2::internal::Call::DetachFromConnection() +28 pw::rpc2::WriteFuture<>::WriteFuture<>() +572 pw::rpc2::internal::MethodFutureImpl<>::Pend() +12 pw::rpc2::UnaryWriter<>::UnaryWriter() +42 pw::rpc2::internal::MethodFutureImpl<>::is_complete() +58 pw::rpc2::internal::MethodFutureImpl<>::is_pendable() NEW +280 pw::rpc2::internal::ReadFutureBase::PendRaw() NEW +112 pw::rpc2::UnaryWriter<>::Finish<>() NEW +112 pw::rpc2::Writer<>::Write<>() NEW +88 pw::rpc2::internal::ReadFutureBase::PendAndDeserialize() NEW +86 pw::rpc2::internal::DeserializeTypeErased<>() NEW +80 pw::rpc2::internal::Call::ClaimRead() NEW +66 pw::rpc2::ReserveWriteFuture::operator=() NEW +52 pw::rpc2::internal::PwpbSerde<>::Deserialize<>() NEW +52 pw::rpc2::internal::ReadFutureBase::ClaimReadIfHasCall() NEW +48 pw::rpc2::internal::ReadFutureBase::operator=() NEW +48 pw::rpc2::internal::WriterBase::ReserveMessage() NEW +48 pw::rpc2::internal::WriterBase::ReserveStreamEnd() NEW +48 pw::rpc2::size_report::pw_rpc2::pwpb::SizeReport::Service<>::kPwInternal_Methods NEW +42 pw::rpc2::internal::ReadFutureBase::ReadFutureBase() NEW +32 pw::rpc2::Writer<>::Finish() NEW +28 pw::rpc2::ReadFuture<>::Pend() NEW +28 pw::rpc2::ReserveWriteFuture::Finish() NEW +28 pw::rpc2::ReserveWriteFuture::Message() NEW +24 pw::rpc2::internal::ReadFutureBase::~ReadFutureBase() NEW +24 pw::rpc2::internal::WriterBase::payload_limit() NEW +22 pw::rpc2::internal::Call::CloseReadOnReaderDestroy() NEW +22 pw::rpc2::internal::Call::ReleaseRead() NEW +20 pw::rpc2::internal::PwpbSerde<>::Serialize<>() NEW +18 pw::rpc2::WriteFuture<>::operator=() NEW +18 pw::rpc2::internal::Call::max_write_size_bytes() NEW +18 pw::rpc2::internal::PwpbSerializer<>::ReservationSize<>() NEW +18 pw::rpc2::internal::ReadFutureBase::ReleaseRead() NEW +18 pw::rpc2::internal::ReaderBase::CloseReadIfHasCall() NEW +16 pw::rpc2::internal::PwpbSerde<>::EncodedSizeBytes<>() NEW +16 pw::rpc2::internal::ReaderBase::~ReaderBase() NEW +12 pw::rpc2::WriteFuture<>::WriteFuture() NEW +10 pw::rpc2::Writer<>::Writer()	+3,378
Incremental cost of generated pwpb::SizeReport::Service (all 4 RPC types) with C++20 coroutines	FLASH +64 pw::rpc2::size_report::Measure() +576 pw::rpc2::internal::MethodInvokerBase<>::InvokeMethod<>() +52 pw::rpc2::internal::SerializeTypeErased<>() +32 pw::rpc2::WriteFuture<>::Pend() +34 pw::rpc2::internal::MethodFutureImpl<>::~MethodFutureImpl() +28 pw::rpc2::internal::MethodFutureImpl<> +2 pw::rpc2::internal::Call::DetachFromConnection() +28 pw::rpc2::WriteFuture<>::WriteFuture<>() +62 pw::rpc2::internal::MethodFutureImpl<>::Pend() +10 pw::rpc2::UnaryWriter<>::UnaryWriter() +10 pw::rpc2::internal::MethodFutureImpl<>::is_complete() +10 pw::rpc2::internal::MethodFutureImpl<>::is_pendable() NEW +418 pw::rpc2::size_report::(anonymous namespace)::PwpbCoroService::MeasureBidiStream() NEW +360 pw::rpc2::size_report::(anonymous namespace)::PwpbCoroService::MeasureClientStream() NEW +294 pw::rpc2::size_report::(anonymous namespace)::PwpbCoroService::MeasureServerStream() NEW +280 pw::rpc2::internal::ReadFutureBase::PendRaw() NEW +224 pw::rpc2::size_report::(anonymous namespace)::PwpbCoroService::MeasureUnary() NEW +112 pw::rpc2::UnaryWriter<>::Finish<>() NEW +88 pw::rpc2::internal::ReadFutureBase::PendAndDeserialize() NEW +86 pw::rpc2::internal::DeserializeTypeErased<>() NEW +80 pw::rpc2::internal::Call::ClaimRead() NEW +74 pw::rpc2::internal::ReadFutureBase::ReadFutureBase() NEW +56 pw::rpc2::Writer<>::Write<>() NEW +52 pw::rpc2::internal::PwpbSerde<>::Deserialize<>() NEW +52 pw::rpc2::internal::ReadFutureBase::ClaimReadIfHasCall() NEW +48 pw::rpc2::internal::WriterBase::ReserveMessage() NEW +48 pw::rpc2::internal::WriterBase::ReserveStreamEnd() NEW +48 pw::rpc2::size_report::pw_rpc2::pwpb::SizeReport::Service<>::kPwInternal_Methods NEW +32 pw::rpc2::Writer<>::Finish() NEW +28 pw::rpc2::ReadFuture<>::Pend() NEW +28 pw::rpc2::ReserveWriteFuture::Finish() NEW +28 pw::rpc2::ReserveWriteFuture::Message() NEW +24 pw::rpc2::internal::ReadFutureBase::~ReadFutureBase() NEW +24 pw::rpc2::internal::WriterBase::payload_limit() NEW +22 pw::rpc2::internal::Call::CloseReadOnReaderDestroy() NEW +22 pw::rpc2::internal::Call::ReleaseRead() NEW +20 pw::rpc2::internal::PwpbSerde<>::Serialize<>() NEW +20 pw::rpc2::internal::PwpbSerializer<>::ReservationSize<>() NEW +20 pw::rpc2::internal::ReaderBase::CloseReadIfHasCall() NEW +18 pw::rpc2::internal::Call::max_write_size_bytes() NEW +18 pw::rpc2::internal::ReadFutureBase::ReleaseRead() NEW +16 pw::rpc2::internal::PwpbSerde<>::EncodedSizeBytes<>() NEW +16 pw::rpc2::internal::ReaderBase::~ReaderBase() NEW +14 pw::rpc2::WriteFuture<>::WriteFuture() NEW +10 pw::rpc2::Writer<>::Writer()	+3,588

Generated client comparison

The following table breaks out the one-time pw_protobuf table-based Message encoder/decoder and pw_rpc2 PWPB serialization cost separately from the incremental cost of calling generated SizeReport::Client methods over the core client baseline (see pw_rpc2/size_report/client_codegen_size_report.cc for the client implementation):

1. One-time ``pw_protobuf`` table encoder/decoder and ``pw_rpc2`` PWPB serialization: One-time table serialization cost when using pwpb client calls.

2. Single unary RPC call: Incremental cost of calling SizeReport::Client::MeasureUnary via raw vs. pwpb.

3. All four RPC call types: Incremental cost of calling unary, server streaming, client streaming, and bidirectional streaming methods via raw vs. pwpb.

Label	Segment	Delta
One-time pw_protobuf table encoder/decoder and pw_rpc2 PWPB serialization	FLASH +8 pw::rpc2::size_report::Measure() +52 pw::protobuf::FieldKey::FieldKey() +112 pw::protobuf::StreamEncoder::StreamEncoder() NEW +1,324 pw::protobuf::StreamEncoder::Write() NEW +956 pw::protobuf::StreamDecoder::Read() NEW +514 pw::protobuf::StreamEncoder::WriteGenericPackedVarints<>() NEW +252 pw::protobuf::StreamDecoder::ReadOneVarint() NEW +224 pw::protobuf::StreamDecoder::ReadFieldKey() NEW +196 pw::protobuf::StreamEncoder::WritePackedFixed() NEW +188 pw::protobuf::StreamDecoder::ReadPackedVarintField() NEW +182 pw::protobuf::StreamDecoder::ReadRepeatedVarintField<>() NEW +180 pw::protobuf::StreamDecoder::SkipField() NEW +180 pw::protobuf::StreamEncoder::GetNestedScratchBuffer() NEW +176 pw::protobuf::StreamDecoder::ReadStringOrBytesField<>() NEW +176 pw::protobuf::StreamEncoder::GetNestedEncoder() NEW +148 pw::protobuf::StreamDecoder::StreamDecoder() NEW +114 pw::protobuf::StreamDecoder::ReadRepeatedFixedField<>() NEW +112 pw::protobuf::StreamDecoder::ReadPackedFixedField() NEW +108 pw::protobuf::StreamDecoder::Next() NEW +108 pw::rpc2::internal::PwpbEncodedSizeBytes() NEW +104 pw::protobuf::StreamDecoder::CloseNestedDecoder() NEW +104 pw::protobuf::StreamDecoder::ReadVarintField() NEW +100 pw::protobuf::StreamDecoder::ReadDelimitedField() NEW +100 pw::protobuf::StreamDecoder::ReadFixedField() NEW +96 pw::protobuf::StreamDecoder::CheckOkToRead() NEW +92 pw::rpc2::internal::PwpbEncode() NEW +90 pw::protobuf::StreamDecoder::ReadRepeatedVarintFieldGeneric() NEW +88 pw::protobuf::StreamDecoder::GetNestedDecoder() NEW +86 pw::protobuf::StreamDecoder::ReadRepeatedFixedFieldGeneric() NEW +84 pw::protobuf::FieldKey::IsValidKey() NEW +84 pw::protobuf::StreamEncoder::ResetOneOfCallbacks() NEW +84 pw::rpc2::internal::PwpbDecode() NEW +80 pw::protobuf::StreamEncoder::WriteFixed() NEW +76 pw::protobuf::StreamDecoder::Advance() NEW +76 pw::protobuf::StreamDecoder::~StreamDecoder() NEW +72 pw::rpc2::size_report::(anonymous namespace)::ExercisePwpbTableEncoderDecoder() NEW +48 pw::protobuf::StreamEncoder::WritePackedVarints<>() NEW +44 pw::protobuf::OneOf<>::Decode() NEW +42 pw::protobuf::StreamEncoder::WriteStringOrBytes<>() NEW +36 pw::protobuf::OneOf<>::Encode() NEW +16 pw::rpc2::size_report::pwpb::SizeReportMessage::_kMessageFields NEW +8 pw::rpc2::size_report::pwpb::SizeReportMessage::kMessageFields	+6,920
Incremental cost of generated raw::SizeReport::Client calling 1 unary RPC	FLASH +84 pw::rpc2::size_report::(anonymous namespace)::ClientMeasurementTask::DoPend() +16 pw::rpc2::internal::CopyMethod<>::Copy() NEW +16 pw::rpc2::size_report::pw_rpc2::raw::SizeReport::Client::Client()	+116
Incremental cost of generated pwpb::SizeReport::Client calling 1 unary RPC	FLASH +60 pw::rpc2::size_report::(anonymous namespace)::ClientMeasurementTask::DoPend() +120 pw::rpc2::internal::GeneratedServiceClient::CallUnary<>() +40 pw::rpc2::UnaryFuture<>::Pend() +50 pw::rpc2::internal::SerializeTypeErased<>() +14 pw::rpc2::UnaryFuture<>::UnaryFuture<>() NEW +92 pw::rpc2::internal::UnaryFutureBase::PendAndDeserialize() NEW +86 pw::rpc2::internal::DeserializeTypeErased<>() NEW +52 pw::rpc2::internal::PwpbSerde<>::Deserialize<>() NEW +20 pw::rpc2::internal::PwpbSerde<>::Serialize<>() NEW +18 pw::rpc2::internal::PwpbSerializer<>::ReservationSize<>() NEW +16 pw::rpc2::internal::PwpbSerde<>::EncodedSizeBytes<>() NEW +16 pw::rpc2::size_report::pw_rpc2::pwpb::SizeReport::Client::Client() NEW +16 pw::rpc2::size_report::pw_rpc2::pwpb::SizeReport::Client::MeasureUnary() NEW +8 pw::rpc2::internal::GeneratedServiceClient::RequestSize<>()	+608
Incremental cost of generated raw::SizeReport::Client calling all 4 RPC types (unary, server/client/bidi stream)	FLASH +224 pw::rpc2::size_report::(anonymous namespace)::ClientMeasurementTask::DoPend() -2 pw::rpc2::internal::ReadFutureBase::ClaimReadIfHasCall() +32 pw::rpc2::internal::ReadFutureBase::ReadFutureBase() +32 pw::rpc2::internal::CopyMethod<>::Copy() NEW +434 pw::rpc2::internal::RequestFutureBase::PendAndCreate<>() NEW +112 pw::rpc2::internal::GeneratedServiceClient::CallServerStream<>() NEW +64 pw::rpc2::RequestFuture<>::Pend() NEW +44 pw::rpc2::ClientStreamCall<>::ClientStreamCall() NEW +44 pw::rpc2::internal::WriterBase::WriterBase() NEW +38 pw::rpc2::internal::GeneratedServiceClient::CallBidiStream<>() NEW +38 pw::rpc2::internal::GeneratedServiceClient::CallClientStream<>() NEW +22 pw::rpc2::RequestFuture<>::RequestFuture<>() NEW +20 pw::rpc2::internal::ReaderBase::CloseReadIfHasCall() NEW +18 pw::rpc2::BidiStreamCall<>::BidiStreamCall() NEW +18 pw::rpc2::BidiStreamCall<>::~BidiStreamCall() NEW +18 pw::rpc2::ClientStreamCall<>::~ClientStreamCall() NEW +18 pw::rpc2::RequestFuture<>::~RequestFuture() NEW +18 pw::rpc2::internal::Call::CloseOnWriterDestroy() NEW +18 pw::rpc2::internal::WriterBase::CleanupIfUnfinished() NEW +16 pw::rpc2::internal::ReaderBase::~ReaderBase() NEW +16 pw::rpc2::internal::WriterBase::~WriterBase() NEW +16 pw::rpc2::size_report::pw_rpc2::raw::SizeReport::Client::Client() NEW +16 pw::rpc2::size_report::pw_rpc2::raw::SizeReport::Client::MeasureBidiStream() NEW +16 pw::rpc2::size_report::pw_rpc2::raw::SizeReport::Client::MeasureClientStream() NEW +10 pw::rpc2::Writer<>::Writer()	+1,300
Incremental cost of generated pwpb::SizeReport::Client calling all 4 RPC types (unary, server/client/bidi stream)	FLASH +180 pw::rpc2::size_report::(anonymous namespace)::ClientMeasurementTask::DoPend() +120 pw::rpc2::internal::GeneratedServiceClient::CallUnary<>() +40 pw::rpc2::UnaryFuture<>::Pend() +50 pw::rpc2::internal::SerializeTypeErased<>() -2 pw::rpc2::internal::ReadFutureBase::ClaimReadIfHasCall() +32 pw::rpc2::internal::ReadFutureBase::ReadFutureBase() +14 pw::rpc2::UnaryFuture<>::UnaryFuture<>() NEW +434 pw::rpc2::internal::RequestFutureBase::PendAndCreate<>() NEW +120 pw::rpc2::internal::GeneratedServiceClient::CallServerStream<>() NEW +92 pw::rpc2::internal::UnaryFutureBase::PendAndDeserialize() NEW +86 pw::rpc2::internal::DeserializeTypeErased<>() NEW +52 pw::rpc2::internal::PwpbSerde<>::Deserialize<>() NEW +44 pw::rpc2::ClientStreamCall<>::ClientStreamCall() NEW +44 pw::rpc2::RequestFuture<>::Pend() NEW +44 pw::rpc2::internal::WriterBase::WriterBase() NEW +38 pw::rpc2::internal::GeneratedServiceClient::CallBidiStream<>() NEW +38 pw::rpc2::internal::GeneratedServiceClient::CallClientStream<>() NEW +20 pw::rpc2::internal::PwpbSerde<>::Serialize<>() NEW +20 pw::rpc2::internal::ReaderBase::CloseReadIfHasCall() NEW +18 pw::rpc2::BidiStreamCall<>::BidiStreamCall() NEW +18 pw::rpc2::BidiStreamCall<>::~BidiStreamCall() NEW +18 pw::rpc2::ClientStreamCall<>::~ClientStreamCall() NEW +18 pw::rpc2::internal::Call::CloseOnWriterDestroy() NEW +18 pw::rpc2::internal::PwpbSerializer<>::ReservationSize<>() NEW +18 pw::rpc2::internal::WriterBase::CleanupIfUnfinished() NEW +16 pw::rpc2::internal::PwpbSerde<>::EncodedSizeBytes<>() NEW +16 pw::rpc2::internal::ReaderBase::~ReaderBase() NEW +16 pw::rpc2::internal::WriterBase::~WriterBase() NEW +16 pw::rpc2::size_report::pw_rpc2::pwpb::SizeReport::Client::Client() NEW +16 pw::rpc2::size_report::pw_rpc2::pwpb::SizeReport::Client::MeasureBidiStream() NEW +16 pw::rpc2::size_report::pw_rpc2::pwpb::SizeReport::Client::MeasureClientStream() NEW +16 pw::rpc2::size_report::pw_rpc2::pwpb::SizeReport::Client::MeasureServerStream() NEW +16 pw::rpc2::size_report::pw_rpc2::pwpb::SizeReport::Client::MeasureUnary() NEW +14 pw::rpc2::RequestFuture<>::RequestFuture<>() NEW +10 pw::rpc2::Writer<>::Writer() NEW +8 pw::rpc2::internal::GeneratedServiceClient::RequestSize<>()	+1,734