Code size analysis

pw_async2: Cooperative async tasks for embedded

Core async2 implementation

The following table shows the code size cost of adding pw_async2 to a system. These size reports assume a baseline system with an RTOS which already uses a handful of core Pigweed components including HAL abstractions and pw_allocator.

The first row captures the core of pw_async2: the dispatcher, tasks, and wakers, using the pw::async2::BasicDispatcher. This is the minimum size cost a system must pay to adopt pw_async2. The following row demonstrates the cost of adding another task to this system. Of course, the majority of the cost of the task exists within its implementation — this simply shows that there is minimal internal overhead.

Label	Segment	Delta
Full cost of including pw_async2	FLASH +884 [section .rodata] -2 std::__2::__cxx_atomic_compare_exchange_weak[abi:nqn240000]<>() +2 pw::Allocator::DoReallocate() -2 pw::GetAlignedSubspan() +40 pw::containers::internal::GenericIntrusiveList<>::remove_if<>() +4 __aeabi_dcmpun +232 pw::async2::size_report::Measure() +14 pw::containers::internal::GenericIntrusiveList<>::remove() NEW +184 pw::async2::Task::RunInDispatcher() NEW +100 pw::async2::Dispatcher::~Dispatcher() NEW +100 pw::this_thread::sleep_for() NEW +96 pw::async2::Task::TryDeregister() NEW +88 pw::async2::Dispatcher::Post() NEW +88 pw::async2::Dispatcher::Terminate() NEW +84 pw::SharedPtr<>::reset() NEW +82 pw::async2::Task::~Task() NEW +76 pw::async2::Dispatcher::Wake() NEW +76 pw::async2::Task::Wake() NEW +76 vTaskDelay NEW +72 pw::async2::size_report::PendableValue<>::Get() NEW +64 pw::async2::Waker::TrySetTask() NEW +60 pw::async2::Waker::operator=() NEW +60 pw::this_thread::get_id() NEW +56 pw::async2::Dispatcher::PopTaskToRun() NEW +56 pw::async2::Task::PostTo() NEW +52 pw::async2::size_report::MockTask::DoPend() NEW +46 pw::async2::size_report::MockTask::~MockTask() NEW +44 pw::async2::Task::UnpostAndReleaseRefFromDispatcherDestructor() NEW +44 pw::async2::Waker::Wake() NEW +42 pw::containers::internal::GenericIntrusiveQueue::remove() NEW +40 __atomic_fetch_add_1 NEW +40 __atomic_fetch_sub_1 NEW +40 __atomic_fetch_sub_4 NEW +36 pw::allocator::internal::ControlBlock::DecrementShared() NEW +36 pw::async2::Task::UnpostAndReleaseRef() NEW +34 pw::async2::Dispatcher::DeregisterTask() NEW +32 __atomic_load_1 NEW +32 pw::async2::Dispatcher::PopTaskToRunLocked() NEW +32 pw::async2::Waker::Clear() NEW +30 pw::async2::BasicDispatcher::~BasicDispatcher() NEW +30 pw::async2::FuncTask<>::~FuncTask() NEW +28 pw::allocator::internal::ControlBlock::~ControlBlock() NEW +28 pw::async2::BasicDispatcher NEW +28 pw::async2::Dispatcher::PopAndRunAllReadyTasks() NEW +28 pw::async2::RunnableDispatcher::RunToCompletion() NEW +26 pw::async2::Dispatcher::UnpostTaskList() NEW +26 pw::containers::internal::GenericIntrusiveQueue::insert_after() NEW +24 pw::async2::Task::Deregister() NEW +22 pw::async2::Task::RemoveAllWakersLocked() NEW +22 pw::async2::Task::Unpost() NEW +22 pw::async2::Waker::RemoveTask() NEW +20 pw::async2::Dispatcher NEW +20 pw::async2::FuncTask<> NEW +20 pw::async2::Task NEW +20 pw::async2::size_report::MockTask NEW +20 pw::async2::size_report::MockTask::DoPend()::{lambda()#1}::operator()() NEW +20 pw::async2::size_report::PendableValue<>::Get()::{lambda()#1}::operator()() NEW +20 pw::containers::internal::GenericIntrusiveQueue::erase_after() NEW +18 pw::async2::FuncTask<>::DoPend() NEW +16 pw::async2::Task::ReleaseSharedRef() NEW +16 pw::async2::Waker::~Waker() NEW +14 pw::allocator::internal::BaseManagedPtr::Deallocate() NEW +14 pw::async2::Waker::RemoveTaskIfSet() NEW +14 pw::async2::internal::YieldToAnyThread() NEW +14 pw::containers::internal::GenericIntrusiveQueue::push_back() NEW +12 pw::containers::internal::GenericIntrusiveQueue::push_front() NEW +10 pw::allocator::internal::BaseManagedPtr::HasCapability() NEW +10 pw::async2::BasicDispatcher::DoWaitForWake() NEW +10 pw::async2::BasicDispatcher::DoWake() NEW +10 pw::containers::internal::GenericIntrusiveQueue::pop_front() NEW +8 pw::allocator::internal::BaseManagedPtr::Resize() NEW +8 pw::async2::RunnableDispatcher::DoRunUntilStalled()	+3,768
	RAM NEW +32 pw::async2::size_report::(anonymous namespace)::dispatcher NEW +8 pw::async2::internal::lock()::lock	+40
Base incremental cost of adding a task to an existing async system	FLASH +56 pw::async2::size_report::Measure() -8 vPortSVCHandler_C	+48
Size of pw_async2’s C++ coroutine adapters	FLASH +268 [section .rodata] +108 pw::async2::size_report::Measure() +2 pw::async2::FuncTask<>::~FuncTask() NEW +208 pw::async2::size_report::StoresFiveThenReturns() NEW +144 pw::async2::Coro<>::Pend() NEW +84 pw::async2::size_report::ImmediatelyReturnsFive() NEW +60 pw::async2::internal::Awaitable<>::Advance() NEW +56 pw::async2::internal::Awaitable<>::await_suspend() NEW +48 pw::async2::CoroTask<>::DoPend() NEW +42 pw::async2::internal::CoroPromiseBase::SharedNew() NEW +42 pw::containers::internal::OptionalData<>::operator=() NEW +40 pw::async2::CoroTask<>::~CoroTask() NEW +36 pw::containers::internal::OptionalData<>::AssignState() NEW +32 pw::async2::internal::CrashDueToCoroutineAllocationFailure() NEW +28 pw::async2::internal::CoroPromiseBase::AdvanceAwaitable() NEW +26 pw::async2::internal::CoroPromiseBase::SharedDelete() NEW +20 pw::async2::CoroTask<> NEW +16 pw::async2::internal::CoroPromiseBase::operator new<>() NEW +12 pw::async2::internal::CoroPromiseBase::operator delete() NEW +8 pw::async2::internal::CoroPromiseBase::SuspendAwaitable<>()::{lambda()#1}::__invoke()	+1,280

Futures

Futures are the core abstraction in pw_async2, providing a standardized way of polling an asynchronous operation to completion.

An important consideration for code size is that all futures are templated on the type of value they produce, which means that the compiler must generate separate code for each type. Pigweed attempts to share common operations through non-templated utilities like FutureCore and makes several optimizations to commonly used future types.

The following sections detail the code size of various future implementations and utilities.

ValueFuture

ValueFuture is the simplest future type, used to return a single result from an asynchronous operation. Its implementation contains effectively the minimal code required for a future, making it a good baseline for understanding the size cost of a future in pw_async2.

The table below shows the size of ValueFuture. The first row shows the base cost of using a single ValueFuture. The second row adds another ValueFuture with a different return type to demonstrate the incremental cost of template specialization. The third row shows the size of VoidFuture (alias for ValueFuture<void>), which is specialized to avoid storing a value.

Label	Segment	Delta
Size of ValueFuture	FLASH +220 [section .rodata] -92 pw::async2::size_report::Measure() DEL -72 pw::async2::size_report::PendableValue<>::Get() -4 vPortSVCHandler_C +2 pw::async2::size_report::MockTask::~MockTask() +2 pw::containers::internal::IntrusiveListItemBase<>::~IntrusiveListItemBase() DEL -20 pw::async2::size_report::PendableValue<>::Get()::{lambda()#1}::operator()() +10 pw::async2::FuncTask<>::DoPend() -2 pw::containers::internal::IntrusiveForwardListItem::DoGetPrevious() +4 __bi_84 NEW +144 pw::async2::size_report::SingleTypeValueFuture() NEW +92 pw::async2::internal::PendValueFutureCore() NEW +56 pw::async2::ValueProvider<>::Get() NEW +52 pw::async2::ValueFuture<>::Pend() NEW +48 pw::async2::ValueFuture<>::ResolveLocked<>() NEW +44 pw::async2::BaseFutureList::PushRequireEmpty() NEW +44 pw::async2::ValueProvider<>::Resolve<>() NEW +40 pw::async2::ValueProvider<>::~ValueProvider() NEW +36 pw::async2::ValueFuture<>::~ValueFuture() NEW +24 pw::containers::internal::IntrusiveListItemBase<>::unlist() NEW +18 pw::async2::FutureCore::~FutureCore() NEW +16 pw::async2::FutureCore::WakeAndMarkReady() NEW +10 pw::async2::FutureCore::Unlist()	+672
	RAM NEW +8 pw::async2::internal::ValueProviderLock()::lock	+8
Cost of additional ValueFuture template specialization	FLASH +8 pw::async2::size_report::Measure() +56 pw::async2::ValueProvider<>::Get() +52 pw::async2::ValueFuture<>::Pend() +48 pw::async2::ValueFuture<>::ResolveLocked<>() +44 pw::async2::ValueProvider<>::Resolve<>() +40 pw::async2::ValueProvider<>::~ValueProvider() +36 pw::async2::ValueFuture<>::~ValueFuture() +30 pw::async2::FuncTask<>::~FuncTask() +30 pw::async2::FuncTask<>::DoPend() +20 pw::async2::FuncTask<> -4 __bi_84 NEW +152 pw::async2::size_report::MultiTypeValueFuture() NEW +80 __aeabi_f2iz	+592
Size of VoidFuture (ValueFuture<void>)	FLASH +208 [section .rodata] -92 pw::async2::size_report::Measure() DEL -72 pw::async2::size_report::PendableValue<>::Get() -8 vPortSVCHandler_C DEL -20 pw::async2::size_report::PendableValue<>::Get()::{lambda()#1}::operator()() -2 pw::async2::FuncTask<>::DoPend() -2 pw::containers::internal::IntrusiveForwardListItem::DoGetPrevious() NEW +128 pw::async2::size_report::VoidFutureReport() NEW +92 pw::async2::internal::PendValueFutureCore() NEW +52 pw::async2::ValueProvider<>::Get() NEW +44 pw::async2::BaseFutureList::PushRequireEmpty() NEW +40 pw::async2::ValueFuture<>::Pend() NEW +40 pw::async2::ValueProvider<>::~ValueProvider() NEW +36 pw::async2::ValueFuture<>::~ValueFuture() NEW +32 pw::async2::ValueProvider<>::Resolve<>() NEW +24 pw::containers::internal::IntrusiveListItemBase<>::unlist() NEW +20 pw::async2::BaseFutureList::ResolveOne() NEW +18 pw::async2::FutureCore::~FutureCore() NEW +14 pw::async2::BaseFutureList::ResolveOneIfAvailable() NEW +14 pw::async2::FutureCore::WakeAndMarkReady() NEW +10 pw::async2::FutureCore::Unlist()	+576
	RAM NEW +8 pw::async2::internal::ValueProviderLock()::lock	+8

async2 utilities

Pigweed provides several utilities to simplify writing asynchronous code. Among these are combinators which operate over several futures, such as Join which waits for all futures to complete, and Select which waits for the first future to complete.

The table below demonstrates the code size impact of using these utilities. For both Join and Select, the report shows:

• The initial cost of using the utility with multiple futures of the same type.

• The incremental cost of adding a second call with futures of different types, which demonstrates the overhead of template specialization.

Additionally, the table includes a comparison showing the code size difference between using the Select helper versus manually polling each future.

Label	Segment	Delta
Size of calling Select() with several futures of the same type	FLASH +128 [section .rodata] +8 pw::async2::size_report::Measure() +86 pw::async2::FuncTask<>::DoPend() -2 pw::containers::internal::IntrusiveListItemBase<>::~IntrusiveListItemBase() +30 pw::async2::FuncTask<>::~FuncTask() +20 pw::async2::FuncTask<> +4 __bi_84 -4 main NEW +200 pw::async2::size_report::SingleTypeSelect() NEW +152 pw::async2::SelectFuture<>::PendFuture<>() NEW +146 pw::async2::SelectFuture<>::Pend() NEW +108 pw::OptionalTuple<>::value<>() NEW +36 pw::OptionalTuple<>::UninitializedMoveFrom<>() NEW +36 pw::async2::SelectFuture<>::PendAll<>() NEW +36 std::__2::__memberwise_forward_assign[abi:nqn240000]<>() NEW +36 std::__2::__tuple_impl<>::__tuple_impl[abi:nqn240000]<>() NEW +32 pw::async2::ValueFuture<>::is_complete() NEW +28 std::__2::__tuple_impl<>::~__tuple_impl() NEW +26 pw::OptionalTuple<>::OptionalTuple() NEW +16 std::__2::tuple<>::tuple[abi:nqn240000]<>() NEW +14 pw::async2::SelectFuture<>::SelectFuture() NEW +12 std::__2::optional<>::optional[abi:nqn240000]<>() NEW +12 std::__2::tuple<>::operator=[abi:nqn240000]()	+1,160
Size of an additional a call to Select() with futures of different types	FLASH +84 pw::async2::FuncTask<>::DoPend() +8 pw::async2::size_report::Measure() +144 pw::async2::SelectFuture<>::PendFuture<>() +142 pw::async2::SelectFuture<>::Pend() +108 pw::OptionalTuple<>::value<>() +30 pw::async2::FuncTask<>::~FuncTask() -12 vPortSVCHandler_C +20 pw::async2::FuncTask<> +36 pw::OptionalTuple<>::UninitializedMoveFrom<>() +36 pw::async2::SelectFuture<>::PendAll<>() +36 std::__2::__memberwise_forward_assign[abi:nqn240000]<>() +34 std::__2::__tuple_impl<>::__tuple_impl[abi:nqn240000]<>() +64 pw::async2::ValueFuture<>::is_complete() +26 std::__2::__tuple_impl<>::~__tuple_impl() +22 pw::OptionalTuple<>::OptionalTuple() -4 __bi_84 +16 std::__2::tuple<>::tuple[abi:nqn240000]<>() +14 pw::async2::SelectFuture<>::SelectFuture() +12 std::__2::optional<>::optional[abi:nqn240000]<>() +12 std::__2::tuple<>::operator=[abi:nqn240000]() NEW +196 pw::async2::size_report::MultiTypeSelect()	+1,024
Cost of using Select() versus manually polling each future	FLASH +128 [section .rodata] +28 pw::async2::size_report::SelectComparisonTask::DoPend() +8 vPortSVCHandler_C -2 pw::containers::internal::IntrusiveListItemBase<>::~IntrusiveListItemBase() NEW +144 pw::async2::SelectFuture<>::PendFuture<>() NEW +142 pw::async2::SelectFuture<>::Pend() NEW +108 pw::OptionalTuple<>::value<>() NEW +96 pw::async2::ValueFuture<>::is_complete() NEW +36 pw::OptionalTuple<>::UninitializedMoveFrom<>() NEW +36 pw::async2::SelectFuture<>::PendAll<>() NEW +36 std::__2::__memberwise_forward_assign[abi:nqn240000]<>() NEW +34 std::__2::__tuple_impl<>::__tuple_impl[abi:nqn240000]<>() NEW +26 std::__2::__tuple_impl<>::~__tuple_impl() NEW +22 pw::OptionalTuple<>::OptionalTuple() NEW +16 std::__2::tuple<>::tuple[abi:nqn240000]<>() NEW +14 pw::async2::SelectFuture<>::SelectFuture() NEW +12 std::__2::optional<>::optional[abi:nqn240000]<>() NEW +12 std::__2::tuple<>::operator=[abi:nqn240000]()	+896
Size of calling Join() with several futures of the same type	FLASH +104 [section .rodata] +8 pw::async2::size_report::Measure() +36 pw::async2::FuncTask<>::DoPend() -4 vPortSVCHandler_C +30 pw::async2::FuncTask<>::~FuncTask() +20 pw::async2::FuncTask<> +4 __bi_84 -4 main NEW +200 pw::async2::size_report::SingleTypeJoin() NEW +100 pw::async2::JoinFuture<>::PendElement<>() NEW +84 pw::async2::JoinFuture<>::Pend() NEW +52 pw::async2::JoinFuture<>::PendElements<>() NEW +48 std::__2::__optional_storage_base<>::__assign_from[abi:nqn240000]<>() NEW +36 std::__2::__tuple_impl<>::__tuple_impl[abi:nqn240000]<>() NEW +28 std::__2::__tuple_impl<>::~__tuple_impl() NEW +26 pw::async2::JoinFuture<>::JoinFuture() NEW +16 std::__2::tuple<>::tuple[abi:nqn240000]<>()	+784
Size of an additional a call to Join() with futures of different types	FLASH +8 pw::async2::size_report::Measure() +32 pw::async2::FuncTask<>::DoPend() +88 pw::async2::JoinFuture<>::PendElement<>() +80 pw::async2::JoinFuture<>::Pend() +30 pw::async2::FuncTask<>::~FuncTask() -8 vPortSVCHandler_C +52 pw::async2::JoinFuture<>::PendElements<>() +48 std::__2::__optional_storage_base<>::__assign_from[abi:nqn240000]<>() +20 pw::async2::FuncTask<> +34 std::__2::__tuple_impl<>::__tuple_impl[abi:nqn240000]<>() +26 std::__2::__tuple_impl<>::~__tuple_impl() +26 pw::async2::JoinFuture<>::JoinFuture() -4 __bi_84 +16 std::__2::tuple<>::tuple[abi:nqn240000]<>() NEW +208 pw::async2::size_report::MultiTypeJoin()	+656

Channel

pw_async2 channels are the primary mechanism for communicating between async tasks and threads.

The following size report shows the base cost of using static and dynamic channels, as well as the marginal cost of adding a new channel of a trivial or non-trivial type.

Label	Segment	Delta
Size of static MpmcChannel	FLASH +436 [section .rodata] DEL -248 pw::async2::size_report::Measure() DEL -72 pw::async2::size_report::PendableValue<>::Get() DEL -60 pw::async2::Waker::operator=() DEL -52 pw::async2::size_report::MockTask::DoPend() DEL -46 pw::async2::size_report::MockTask::~MockTask() +30 pw::async2::FuncTask<>::~FuncTask() DEL -28 pw::async2::RunnableDispatcher::RunToCompletion() +20 pw::async2::FuncTask<> DEL -20 pw::async2::size_report::MockTask DEL -20 pw::async2::size_report::MockTask::DoPend()::{lambda()#1}::operator()() DEL -20 pw::async2::size_report::PendableValue<>::Get()::{lambda()#1}::operator()() +2 pw::async2::FuncTask<>::DoPend() +2 pw::containers::internal::GenericIntrusiveList<>::push_back() -2 pw::containers::internal::IntrusiveForwardListItem::DoGetPrevious() +2 pw::async2::BasicDispatcher::DoWaitForWake() +4 main NEW +256 pw::async2::size_report::MeasureStatic<>() NEW +144 pw::async2::SendFuture<>::DoPend() NEW +132 pw::async2::ReceiveFuture<>::DoPend() NEW +108 pw::async2::internal::BaseChannelFuture::BaseChannelFuture() NEW +96 pw::async2::internal::BaseChannelFuture::StoreWakerForReceiveIfOpen() NEW +88 pw::async2::internal::BaseChannel::remove_object() NEW +76 pw::async2::internal::BaseChannel::~BaseChannel() NEW +72 pw::async2::internal::BaseChannelFuture::StoreWakerForSend() NEW +68 pw::async2::CreateMpmcChannel<>() NEW +52 pw::async2::internal::BaseChannel::add_object() NEW +46 pw::async2::size_report::MeasureStatic<>()::{lambda()#1}::operator()() NEW +44 pw::async2::ChannelHandle<>::CreateReceiver() NEW +44 pw::async2::ChannelHandle<>::CreateSender() NEW +44 pw::async2::internal::BaseChannel::add_ref() NEW +44 pw::containers::internal::GenericDeque<>::front() NEW +44 pw::containers::internal::GenericDeque<>::pop_front() NEW +42 pw::async2::internal::Channel<>::CreateReceiver() NEW +42 pw::async2::internal::Channel<>::CreateSender() NEW +42 pw::async2::size_report::MeasureStatic<>()::{lambda()#2}::operator()() NEW +40 pw::async2::internal::BaseChannel::BaseChannel() NEW +40 pw::async2::internal::ChannelFuture<>::Pend() NEW +40 pw::containers::internal::GenericDeque<>::push_back() NEW +36 pw::async2::internal::BaseChannel::RemoveRefAndDestroyIfUnreferenced() NEW +36 pw::containers::internal::GenericDeque<>::try_emplace_back<>() NEW +34 pw::async2::internal::BaseChannelFuture::StoreAndAddRefIfNonnull() NEW +32 pw::FixedDeque<>::~FixedDeque() NEW +32 pw::async2::Dispatcher::Dispatcher() NEW +32 pw::async2::internal::BaseChannelStorage<>::BaseChannelStorage() NEW +32 pw::async2::internal::Channel<>::Channel<>() NEW +32 pw::async2::internal::Channel<>::PopAndWake() NEW +32 pw::async2::internal::Channel<>::~Channel() NEW +30 pw::async2::internal::BaseChannelFuture::RemoveFromChannel() NEW +28 pw::async2::BaseFutureList::ResolveAll() NEW +28 pw::async2::RunnableDispatcher NEW +28 pw::async2::internal::BaseChannel::should_close() NEW +24 pw::async2::BasicDispatcher::BasicDispatcher() NEW +24 pw::async2::internal::BaseChannel::CloseLocked() NEW +24 pw::containers::internal::GenericDequeBase<>::PopFront() NEW +24 pw::containers::internal::GenericDequeBase<>::PushBack() NEW +24 pw::containers::internal::IntrusiveListItemBase<>::unlist() NEW +20 pw::async2::BaseFutureList::ResolveOne() NEW +20 pw::async2::ChannelStorage<>::ChannelStorage() NEW +20 pw::async2::Receiver<>::Disconnect() NEW +20 pw::async2::RunnableDispatcher::RunnableDispatcher() NEW +20 pw::async2::SendFuture<>::SendFuture() NEW +20 pw::async2::Sender<>::Disconnect() NEW +20 pw::async2::internal::BaseChannelHandle::Release() NEW +20 pw::async2::internal::Channel<>::PushAndWake<>() NEW +20 pw::containers::internal::GenericDeque<>::EmplaceBackUnchecked<>() NEW +18 pw::async2::FutureCore::~FutureCore() NEW +18 pw::async2::ReceiveFuture<>::~ReceiveFuture() NEW +18 pw::async2::Receiver<>::~Receiver() NEW +18 pw::async2::SendFuture<>::~SendFuture() NEW +18 pw::async2::Sender<>::~Sender() NEW +16 pw::async2::internal::BaseChannelFuture::Complete() NEW +14 pw::async2::BaseFutureList::ResolveOneIfAvailable() NEW +14 pw::async2::FutureCore::WakeAndMarkReady() NEW +14 pw::async2::internal::BaseChannel::add_handle() NEW +12 pw::async2::ChannelStorage<> NEW +12 pw::async2::internal::BaseChannel NEW +12 pw::async2::internal::BaseChannel::add_receiver() NEW +12 pw::async2::internal::BaseChannel::add_sender() NEW +12 pw::async2::internal::BaseChannel::remove_handle() NEW +12 pw::async2::internal::BaseChannel::remove_receiver() NEW +12 pw::async2::internal::BaseChannel::remove_sender() NEW +12 pw::async2::internal::BaseChannelStorage<> NEW +12 pw::async2::internal::Channel<> NEW +10 pw::async2::FutureCore::Unlist() NEW +10 pw::async2::ReceiveFuture<>::ReceiveFuture() NEW +10 pw::async2::Receiver<>::Receive() NEW +10 pw::async2::Sender<>::Send<>() NEW +2 pw::async2::RunnableDispatcher::~RunnableDispatcher() NEW +2 pw::async2::internal::BaseChannel::Destroy()	+2,544
	RAM DEL -32 pw::async2::size_report::(anonymous namespace)::dispatcher	-32
Cost of additional static MpmcChannel<unsigned> instantiation	FLASH +256 pw::async2::size_report::MeasureStatic<>() +144 pw::async2::SendFuture<>::DoPend() +132 pw::async2::ReceiveFuture<>::DoPend() +68 pw::async2::CreateMpmcChannel<>() +60 pw::async2::FuncTask<>::~FuncTask() -8 vPortSVCHandler_C +46 pw::async2::size_report::MeasureStatic<>()::{lambda()#1}::operator()() +44 pw::async2::ChannelHandle<>::CreateReceiver() +44 pw::async2::ChannelHandle<>::CreateSender() +44 pw::containers::internal::GenericDeque<>::front() +44 pw::containers::internal::GenericDeque<>::pop_front() +42 pw::async2::internal::Channel<>::CreateReceiver() +42 pw::async2::internal::Channel<>::CreateSender() +40 pw::async2::size_report::MeasureStatic<>()::{lambda()#2}::operator()() +40 pw::async2::FuncTask<> +40 pw::async2::internal::ChannelFuture<>::Pend() +40 pw::containers::internal::GenericDeque<>::push_back() +36 pw::containers::internal::GenericDeque<>::try_emplace_back<>() +32 pw::FixedDeque<>::~FixedDeque() +32 pw::async2::internal::BaseChannelStorage<>::BaseChannelStorage() +32 pw::async2::internal::Channel<>::Channel<>() +32 pw::async2::internal::Channel<>::PopAndWake() +32 pw::async2::internal::Channel<>::~Channel() +20 pw::async2::ChannelStorage<>::ChannelStorage() +20 pw::async2::FuncTask<>::DoPend() +20 pw::async2::Receiver<>::Disconnect() +20 pw::async2::SendFuture<>::SendFuture() +20 pw::async2::Sender<>::Disconnect() +20 pw::async2::internal::Channel<>::PushAndWake<>() +20 pw::containers::internal::GenericDeque<>::EmplaceBackUnchecked<>() +18 pw::async2::ReceiveFuture<>::~ReceiveFuture() +18 pw::async2::Receiver<>::~Receiver() +18 pw::async2::SendFuture<>::~SendFuture() +18 pw::async2::Sender<>::~Sender() +4 __bi_84 +4 main +12 pw::async2::ChannelStorage<> +12 pw::async2::internal::BaseChannelStorage<> +12 pw::async2::internal::Channel<> +10 pw::async2::ReceiveFuture<>::ReceiveFuture() +10 pw::async2::Receiver<>::Receive() +10 pw::async2::Sender<>::Send<>()	+1,600
Cost of additional static MpmcChannel<MoveOnly> instantiation	FLASH +256 pw::async2::size_report::MeasureStatic<>() +144 pw::async2::SendFuture<>::DoPend() +132 pw::async2::ReceiveFuture<>::DoPend() +68 pw::async2::CreateMpmcChannel<>() +60 pw::async2::FuncTask<>::~FuncTask() -8 vPortSVCHandler_C +46 pw::async2::size_report::MeasureStatic<>()::{lambda()#1}::operator()() +44 pw::async2::ChannelHandle<>::CreateReceiver() +44 pw::async2::ChannelHandle<>::CreateSender() +44 pw::containers::internal::GenericDeque<>::front() +44 pw::containers::internal::GenericDeque<>::pop_front() +42 pw::async2::internal::Channel<>::CreateReceiver() +42 pw::async2::internal::Channel<>::CreateSender() +40 pw::async2::size_report::MeasureStatic<>()::{lambda()#2}::operator()() +40 pw::async2::FuncTask<> +40 pw::async2::internal::ChannelFuture<>::Pend() +40 pw::containers::internal::GenericDeque<>::push_back() +36 pw::containers::internal::GenericDeque<>::try_emplace_back<>() +32 pw::FixedDeque<>::~FixedDeque() +32 pw::async2::internal::BaseChannelStorage<>::BaseChannelStorage() +32 pw::async2::internal::Channel<>::Channel<>() +32 pw::async2::internal::Channel<>::PopAndWake() +32 pw::async2::internal::Channel<>::~Channel() +20 pw::async2::ChannelStorage<>::ChannelStorage() +20 pw::async2::FuncTask<>::DoPend() +20 pw::async2::Receiver<>::Disconnect() +20 pw::async2::SendFuture<>::SendFuture() +20 pw::async2::Sender<>::Disconnect() +20 pw::async2::internal::Channel<>::PushAndWake<>() +20 pw::containers::internal::GenericDeque<>::EmplaceBackUnchecked<>() +18 pw::async2::ReceiveFuture<>::~ReceiveFuture() +18 pw::async2::Receiver<>::~Receiver() +18 pw::async2::SendFuture<>::~SendFuture() +18 pw::async2::Sender<>::~Sender() +4 __bi_84 +4 main +12 pw::async2::ChannelStorage<> +12 pw::async2::internal::BaseChannelStorage<> +12 pw::async2::internal::Channel<> +10 pw::async2::ReceiveFuture<>::ReceiveFuture() +10 pw::async2::Receiver<>::Receive() +10 pw::async2::Sender<>::Send<>()	+1,600
Size of dynamic MpmcChannel	FLASH +416 [section .rodata] DEL -248 pw::async2::size_report::Measure() DEL -72 pw::async2::size_report::PendableValue<>::Get() DEL -60 pw::async2::Waker::operator=() -8 vPortSVCHandler_C DEL -52 pw::async2::size_report::MockTask::DoPend() DEL -46 pw::async2::size_report::MockTask::~MockTask() +30 pw::async2::FuncTask<>::~FuncTask() DEL -28 pw::async2::RunnableDispatcher::RunToCompletion() +20 pw::async2::FuncTask<> DEL -20 pw::async2::size_report::MockTask DEL -20 pw::async2::size_report::MockTask::DoPend()::{lambda()#1}::operator()() DEL -20 pw::async2::size_report::PendableValue<>::Get()::{lambda()#1}::operator()() +68 pw::async2::FuncTask<>::DoPend() +2 pw::containers::internal::GenericIntrusiveList<>::push_back() -2 pw::containers::internal::IntrusiveForwardListItem::DoGetPrevious() +2 pw::async2::BasicDispatcher::DoWaitForWake() +4 main NEW +252 pw::async2::size_report::MeasureDynamic() NEW +144 pw::async2::SendFuture<>::DoPend() NEW +132 pw::async2::ReceiveFuture<>::DoPend() NEW +110 pw::async2::internal::BaseChannelFuture::BaseChannelFuture() NEW +96 pw::async2::internal::BaseChannelFuture::StoreWakerForReceiveIfOpen() NEW +88 pw::async2::internal::BaseChannel::remove_object() NEW +76 pw::async2::internal::BaseChannel::~BaseChannel() NEW +72 pw::async2::internal::BaseChannelFuture::StoreWakerForSend() NEW +64 pw::async2::CreateMpmcChannel<>() NEW +52 pw::FixedDeque<>::TryAllocate() NEW +52 pw::async2::internal::BaseChannel::add_object() NEW +48 pw::async2::internal::DynamicChannel<>::Allocate() NEW +44 pw::async2::ChannelHandle<>::CreateReceiver() NEW +44 pw::async2::ChannelHandle<>::CreateSender() NEW +44 pw::async2::internal::BaseChannel::add_ref() NEW +44 pw::containers::internal::Aligned<>::Align() NEW +44 pw::containers::internal::GenericDeque<>::front() NEW +44 pw::containers::internal::GenericDeque<>::pop_front() NEW +42 pw::async2::internal::Channel<>::CreateReceiver() NEW +42 pw::async2::internal::Channel<>::CreateSender() NEW +40 pw::async2::internal::BaseChannel::BaseChannel() NEW +40 pw::async2::internal::ChannelFuture<>::Pend() NEW +40 pw::containers::internal::GenericDeque<>::push_back() NEW +36 pw::async2::internal::BaseChannel::RemoveRefAndDestroyIfUnreferenced() NEW +36 pw::async2::internal::Channel<>::Channel() NEW +36 pw::containers::internal::GenericDeque<>::try_emplace_back<>() NEW +34 pw::FixedDeque<>::FixedDeque() NEW +34 pw::async2::internal::BaseChannelFuture::StoreAndAddRefIfNonnull() NEW +32 pw::FixedDeque<>::~FixedDeque() NEW +32 pw::async2::Dispatcher::Dispatcher() NEW +32 pw::async2::internal::Channel<>::PopAndWake() NEW +32 pw::async2::internal::Channel<>::~Channel() NEW +30 pw::Deque<>::Deque() NEW +30 pw::async2::internal::BaseChannelFuture::RemoveFromChannel() NEW +28 pw::async2::BaseFutureList::ResolveAll() NEW +28 pw::async2::RunnableDispatcher NEW +28 pw::async2::internal::BaseChannel::should_close() NEW +28 pw::async2::internal::ChannelDeque<>::TryAllocate() NEW +28 pw::containers::internal::GenericDequeBase<>::MoveAssignIndices() NEW +24 pw::Allocator::New<>() NEW +24 pw::async2::BasicDispatcher::BasicDispatcher() NEW +24 pw::async2::internal::BaseChannel::CloseLocked() NEW +24 pw::async2::internal::DynamicChannel<>::Destroy() NEW +24 pw::containers::internal::GenericDequeBase<>::PopFront() NEW +24 pw::containers::internal::GenericDequeBase<>::PushBack() NEW +24 pw::containers::internal::IntrusiveListItemBase<>::unlist() NEW +20 pw::allocator::Layout::Of<>() NEW +20 pw::async2::BaseFutureList::ResolveOne() NEW +20 pw::async2::Receiver<>::Disconnect() NEW +20 pw::async2::RunnableDispatcher::RunnableDispatcher() NEW +20 pw::async2::SendFuture<>::SendFuture() NEW +20 pw::async2::Sender<>::Disconnect() NEW +20 pw::async2::internal::BaseChannelHandle::Release() NEW +20 pw::async2::internal::Channel<>::PushAndWake<>() NEW +20 pw::async2::internal::DynamicChannel<>::DynamicChannel() NEW +20 pw::containers::internal::GenericDeque<>::EmplaceBackUnchecked<>() NEW +20 std::__2::__optional_destruct_base<>::~__optional_destruct_base[abi:nqn240000]() NEW +18 pw::async2::FutureCore::~FutureCore() NEW +18 pw::async2::ReceiveFuture<>::~ReceiveFuture() NEW +18 pw::async2::Receiver<>::~Receiver() NEW +18 pw::async2::SendFuture<>::~SendFuture() NEW +18 pw::async2::Sender<>::~Sender() NEW +16 pw::Deque<>::MoveBufferFrom() NEW +16 pw::async2::internal::BaseChannelFuture::Complete() NEW +14 pw::async2::BaseFutureList::ResolveOneIfAvailable() NEW +14 pw::async2::FutureCore::WakeAndMarkReady() NEW +12 pw::async2::internal::BaseChannel NEW +12 pw::async2::internal::BaseChannel::add_handle() NEW +12 pw::async2::internal::BaseChannel::add_receiver() NEW +12 pw::async2::internal::BaseChannel::add_sender() NEW +12 pw::async2::internal::BaseChannel::remove_handle() NEW +12 pw::async2::internal::BaseChannel::remove_receiver() NEW +12 pw::async2::internal::BaseChannel::remove_sender() NEW +12 pw::async2::internal::Channel<> NEW +12 pw::async2::internal::DynamicChannel<> NEW +10 pw::async2::FutureCore::Unlist() NEW +10 pw::async2::ReceiveFuture<>::ReceiveFuture() NEW +10 pw::async2::Receiver<>::Receive() NEW +10 pw::async2::Sender<>::Send<>() NEW +4 pw::async2::internal::BaseChannel::Destroy() NEW +2 pw::async2::RunnableDispatcher::~RunnableDispatcher()	+2,816
	RAM DEL -32 pw::async2::size_report::(anonymous namespace)::dispatcher	-32
Cost of static MpmcChannel when dynamic of same type is present	FLASH +20 [section .rodata] +20 pw::async2::FuncTask<>::DoPend() +68 pw::async2::CreateMpmcChannel<>() +60 pw::async2::FuncTask<>::~FuncTask() +12 vPortSVCHandler_C +40 pw::async2::FuncTask<> +4 __bi_84 +4 main +2 pw::async2::internal::BaseChannel::add_handle() -2 pw::async2::internal::BaseChannel::Destroy() NEW +256 pw::async2::size_report::MeasureStatic<>() NEW +46 pw::async2::size_report::MeasureStatic<>()::{lambda()#1}::operator()() NEW +42 pw::async2::size_report::MeasureStatic<>()::{lambda()#2}::operator()() NEW +32 pw::async2::internal::BaseChannelStorage<>::BaseChannelStorage() NEW +32 pw::async2::internal::Channel<>::Channel<>() NEW +20 pw::async2::ChannelStorage<>::ChannelStorage() NEW +12 pw::async2::ChannelStorage<> NEW +12 pw::async2::internal::BaseChannelStorage<>	+680
Size of MpmcChannel<void>	FLASH +296 [section .rodata] DEL -248 pw::async2::size_report::Measure() DEL -72 pw::async2::size_report::PendableValue<>::Get() DEL -60 pw::async2::Waker::operator=() +4 vPortSVCHandler_C DEL -52 pw::async2::size_report::MockTask::DoPend() DEL -46 pw::async2::size_report::MockTask::~MockTask() +30 pw::async2::FuncTask<>::~FuncTask() DEL -28 pw::async2::RunnableDispatcher::RunToCompletion() +20 pw::async2::FuncTask<> DEL -20 pw::async2::size_report::MockTask DEL -20 pw::async2::size_report::MockTask::DoPend()::{lambda()#1}::operator()() DEL -20 pw::async2::size_report::PendableValue<>::Get()::{lambda()#1}::operator()() +2 pw::async2::FuncTask<>::DoPend() +2 pw::containers::internal::GenericIntrusiveList<>::push_back() -2 pw::containers::internal::IntrusiveForwardListItem::DoGetPrevious() +4 __bi_84 +2 pw::async2::BasicDispatcher::DoWaitForWake() +4 main NEW +256 pw::async2::size_report::MeasureStatic<>() NEW +140 pw::async2::SendFuture<>::DoPend() NEW +120 pw::async2::ReceiveFuture<>::DoPend() NEW +108 pw::async2::internal::BaseChannelFuture::BaseChannelFuture() NEW +96 pw::async2::internal::BaseChannelFuture::StoreWakerForReceiveIfOpen() NEW +88 pw::async2::internal::BaseChannel::remove_object() NEW +76 pw::async2::internal::BaseChannel::~BaseChannel() NEW +72 pw::async2::internal::BaseChannelFuture::StoreWakerForSend() NEW +68 pw::async2::CreateMpmcChannel<>() NEW +52 pw::async2::internal::BaseChannel::add_object() NEW +44 pw::async2::ChannelHandle<>::CreateReceiver() NEW +44 pw::async2::ChannelHandle<>::CreateSender() NEW +44 pw::async2::internal::BaseChannel::add_ref() NEW +44 pw::async2::internal::ChannelDeque<>::push_back() NEW +42 pw::async2::internal::Channel<>::CreateReceiver() NEW +42 pw::async2::internal::Channel<>::CreateSender() NEW +40 pw::async2::internal::BaseChannel::BaseChannel() NEW +40 pw::async2::internal::ChannelDeque<>::pop_front() NEW +40 pw::async2::size_report::MeasureStatic<>()::{lambda()#1}::operator()() NEW +40 pw::async2::size_report::MeasureStatic<>()::{lambda()#2}::operator()() NEW +36 pw::async2::internal::BaseChannel::RemoveRefAndDestroyIfUnreferenced() NEW +36 pw::async2::internal::ChannelFuture<>::Pend() NEW +34 pw::async2::internal::BaseChannelFuture::StoreAndAddRefIfNonnull() NEW +32 pw::async2::Dispatcher::Dispatcher() NEW +30 pw::async2::internal::BaseChannelFuture::RemoveFromChannel() NEW +28 pw::async2::BaseFutureList::ResolveAll() NEW +28 pw::async2::RunnableDispatcher NEW +28 pw::async2::internal::BaseChannel::should_close() NEW +28 pw::async2::internal::BaseChannelStorage<>::BaseChannelStorage() NEW +28 pw::async2::internal::Channel<>::Channel() NEW +24 pw::async2::BasicDispatcher::BasicDispatcher() NEW +24 pw::async2::internal::BaseChannel::CloseLocked() NEW +24 pw::containers::internal::IntrusiveListItemBase<>::unlist() NEW +20 pw::async2::BaseFutureList::ResolveOne() NEW +20 pw::async2::ChannelStorage<>::ChannelStorage() NEW +20 pw::async2::Receiver<>::Disconnect() NEW +20 pw::async2::RunnableDispatcher::RunnableDispatcher() NEW +20 pw::async2::SendFuture<>::~SendFuture() NEW +20 pw::async2::Sender<>::Disconnect() NEW +20 pw::async2::internal::BaseChannelHandle::Release() NEW +20 pw::async2::internal::Channel<>::PopAndWake() NEW +20 pw::async2::internal::Channel<>::PushAndWake() NEW +18 pw::async2::FutureCore::~FutureCore() NEW +18 pw::async2::ReceiveFuture<>::~ReceiveFuture() NEW +18 pw::async2::Receiver<>::~Receiver() NEW +18 pw::async2::Sender<>::~Sender() NEW +18 pw::async2::internal::BaseChannelFuture::Complete() NEW +14 pw::async2::BaseFutureList::ResolveOneIfAvailable() NEW +14 pw::async2::FutureCore::WakeAndMarkReady() NEW +14 pw::async2::internal::BaseChannel::add_handle() NEW +12 pw::async2::ChannelStorage<> NEW +12 pw::async2::internal::BaseChannel NEW +12 pw::async2::internal::BaseChannel::add_receiver() NEW +12 pw::async2::internal::BaseChannel::add_sender() NEW +12 pw::async2::internal::BaseChannel::remove_handle() NEW +12 pw::async2::internal::BaseChannel::remove_receiver() NEW +12 pw::async2::internal::BaseChannel::remove_sender() NEW +12 pw::async2::internal::BaseChannelStorage<> NEW +12 pw::async2::internal::Channel<> NEW +10 pw::async2::FutureCore::Unlist() NEW +10 pw::async2::ReceiveFuture<>::ReceiveFuture() NEW +10 pw::async2::Receiver<>::Receive() NEW +10 pw::async2::Sender<>::Send() NEW +2 pw::async2::RunnableDispatcher::~RunnableDispatcher() NEW +2 pw::async2::internal::BaseChannel::Destroy()	+2,136
	RAM DEL -32 pw::async2::size_report::(anonymous namespace)::dispatcher	-32
Cost of MpmcChannel<void> with static MpmcChannel<int>	FLASH +140 [section .rodata] +256 pw::async2::size_report::MeasureStatic<>() +144 pw::async2::SendFuture<>::DoPend() +132 pw::async2::ReceiveFuture<>::DoPend() +68 pw::async2::CreateMpmcChannel<>() +60 pw::async2::FuncTask<>::~FuncTask() -8 vPortSVCHandler_C +44 pw::async2::ChannelHandle<>::CreateReceiver() +44 pw::async2::ChannelHandle<>::CreateSender() +42 pw::async2::internal::Channel<>::CreateReceiver() +42 pw::async2::internal::Channel<>::CreateSender() +40 pw::async2::FuncTask<> +46 pw::async2::size_report::MeasureStatic<>()::{lambda()#1}::operator()() +42 pw::async2::size_report::MeasureStatic<>()::{lambda()#2}::operator()() +40 pw::async2::internal::ChannelFuture<>::Pend() +32 pw::async2::internal::BaseChannelStorage<>::BaseChannelStorage() +20 pw::async2::ChannelStorage<>::ChannelStorage() +20 pw::async2::FuncTask<>::DoPend() +20 pw::async2::Receiver<>::Disconnect() +18 pw::async2::SendFuture<>::~SendFuture() +20 pw::async2::Sender<>::Disconnect() +32 pw::async2::internal::Channel<>::PopAndWake() +18 pw::async2::ReceiveFuture<>::~ReceiveFuture() +18 pw::async2::Receiver<>::~Receiver() +18 pw::async2::Sender<>::~Sender() -2 pw::async2::internal::BaseChannelFuture::Complete() +4 main +12 pw::async2::ChannelStorage<> +12 pw::async2::internal::BaseChannelStorage<> +12 pw::async2::internal::Channel<> +10 pw::async2::ReceiveFuture<>::ReceiveFuture() +10 pw::async2::Receiver<>::Receive() NEW +44 pw::containers::internal::GenericDeque<>::front() NEW +44 pw::containers::internal::GenericDeque<>::pop_front() NEW +40 pw::containers::internal::GenericDeque<>::push_back() NEW +36 pw::containers::internal::GenericDeque<>::try_emplace_back<>() NEW +32 pw::FixedDeque<>::~FixedDeque() NEW +32 pw::async2::internal::Channel<>::Channel<>() NEW +32 pw::async2::internal::Channel<>::~Channel() NEW +24 pw::containers::internal::GenericDequeBase<>::PopFront() NEW +24 pw::containers::internal::GenericDequeBase<>::PushBack() NEW +20 pw::async2::SendFuture<>::SendFuture() NEW +20 pw::async2::internal::Channel<>::PushAndWake<>() NEW +20 pw::containers::internal::GenericDeque<>::EmplaceBackUnchecked<>() NEW +10 pw::async2::Sender<>::Send<>()	+1,784