Add UnfoldResource ValueTask Stage and DSL methods #7028

to11mtm · 2023-12-27T23:20:34Z

Changes

Adds Akka.Streams Source stages:

UnfoldValueTaskAsync <-- VT Optimized version of UnfoldAsync
UnfoldResourceValueTaskAsync <-- VT Optimized version of UnfoldResourceAsync
SelectValueTaskAsync <-- VT Optimized version of SelectAsync

This allows all sorts of potential benefits to end users, including:

A 'fast-path' successful synchronous return capability;
The ability for consumers to more easily pool completion awaiters if they so choose.
The ability to avoid accidental overcapture between passed lambdas.

Checklist

For significant changes, please ensure that the following have been completed (delete if not relevant):

This change follows the Akka.NET API Compatibility Guidelines.
This change follows the Akka.NET Wire Compatibility Guidelines.
I have reviewed my own pull request.
Design discussion issue #
Changes in public API reviewed, if any.
I have added website documentation for this feature.

Latest `dev` Benchmarks

N/A since these are 'new' APIs.

This PR's Benchmarks

See other comments, overall the new methods are 'at least' as fast with lower allocation, at worst we are 0-10% faster but in some cases we are twice as fast :D

to11mtm · 2024-01-01T20:21:21Z

src/core/Akka.Streams/Implementation/Sources.cs

+            private readonly PooledValueTaskContinuationHelper<Option<TOut>>
+                _pooledContinuation;


It's entirely possible that this entire pattern is overkill and we should consider using Result or Result+Holder patterns consistently throughout these implementations for consistency's sake.

or, maybe, the 'hold local' pattern we use for the UnfoldValueTaskAsync?

I'd stick with one implementation pattern for this - I think the Holder pattern is easier to reason about so far but I haven't had to debug any of this code yet :p

Holder pattern is easier to reason about, Especially from a 'safety' standpoint...

But since these are internals, I would expect that unless the ActorGraphInterpreter is broken, that the debugging experience would not be overly diminished for maintainers; instead of peeking at Result property state they just need to instead look at the ValueTask state. Also it's a -little- less code to maintain.

The win, is that directly holding the VT removes indirection Result introduces

Note: We do need to keep Holder however for SelectAsync due to it's internal parallelism and logic rules.

Really though, I want to have benchmarks of Task vs this state first before I try to standardize things, just in case the difference of keeping a specific impl is worth a discussion, and/or if whichever we 'pick' shows notable regression (which means, maybe try the other one.) Kinda the other part of why I tried a few different strategies here, This may be important for Artery.

src/core/Akka.Streams/Implementation/Fusing/Ops.cs

to11mtm · 2024-01-01T20:26:52Z

src/core/Akka.Streams/Implementation/Fusing/Ops.cs

+            {
+                public Result<T> Element { get; private set; }
+                private readonly Action<Holder<T>> _callback;
+                private ValueTask<T> _pending;


It seemed to me, that the best thing to do here was have Holder<T> itself keep the continuation and just re-use them appropriately.

Yes, it costs the size of ValueTask<T> but we'd take at least that .AsTask()ing and in this case we only pay it 'once'.

Seems pretty clever to me - I'd love to see a benchmark comparison between this and a normal SelectAsync

Latest benchmarks are in comments, It's 5-10% faster and improved alloc!

Additional note, There probably are additional opts to be made here but I tried to keep it, for lack of a better term, 'debugging friendly' as much as I could. :)

to11mtm · 2024-01-01T20:28:22Z

src/core/Akka.Streams/Implementation/Fusing/Ops.cs

+            private readonly
+                ConcurrentQueue<
+                    Holder<TOut>> _queue;


The idea here, is that we treat used Holders as 'Lazy' instances, so this will only grow to the size of parallelism at the most, and even then only if we get to that level of demand.

to11mtm · 2024-01-01T20:38:03Z

src/core/Akka.Streams/Implementation/Unfold.cs

+            private void CompletionAction()
+            {
+                if (_currentTask.IsCompletedSuccessfully)
+                {
+                    _asyncHandler.Invoke(Result.Success(_currentTask.Result));
+                }
+                else
+                {
+                    _asyncHandler.Invoke(
+                        Result.FromTask(_currentTask.AsTask()));
+                }
+            }


This should be capturing, then clearing clearing the _currentTask

to11mtm · 2024-01-02T23:35:25Z

src/core/Akka.Streams/Implementation/Fusing/Ops.cs

+                    var peeker =
+                        Unsafe.As<ValueTask<T>, ValueTaskCheatingPeeker<T>>(
+                            ref valueTask);
+                    if (peeker._obj == null)
+                    {
+                        Invoke(Result.Success(peeker._result));
+                    }
+                    else if (peeker._obj is Task<T> asTask)
+                    {
+                        asTask.ContinueWith(TaskCompletedAction, this,
+                            TaskContinuationOptions.NotOnCanceled);
+                    }
+                    else
+                    {
+                        _pending = vt;
+                        var source =
+                            Unsafe.As<IValueTaskSource<T>>(peeker._obj);
+                        source.OnCompleted(OnCompletedAction, this,
+                            peeker._token,
+                            ValueTaskSourceOnCompletedFlags.None);
+                    }


"Magic"

We get back a ValueTask<T>

Unfortunately, Polite callbacks are not exposed

In other words, we can't pass a state in.

So we just abuse Unsafe.As and roll with that.

If this pattern (b/c we do it elsewhere) is overly offensive (I get it) there are some options that come to mind:

Always pull the ValueTask into a given holder/scope and use a static continuation

do a 'pre-check' and branch logic accordingly

I've seen this done in other libs, it's painful for whoever does it the first time but way cleaner than you would think.

Fallback would be some form of compiled expression/etc.

Hide all of this behind the newest .NET and rely on UnsafeAccessor to get the fields.

To use Unsafe.As, do we have to set an attribute on the assembly? I think we do this for some unsafe stuff inside Akka.Remote already.

I don't think so. Unsafe.As (and many/most other parts of that API) does not have unsafe on the public API method signature.

Aaronontheweb

Left some feedback; would love some benchmarks showcasing the perf gains possible using these stages vs. their Task-y equivalents.

Aaronontheweb · 2024-01-03T22:32:12Z

src/core/Akka.Streams/Dsl/Source.cs

+        /// <typeparam name="T"></typeparam>
+        /// <typeparam name="TSource"></typeparam>
+        /// <returns>A source of T that is created on stream start and read on backpressure</returns>
+        public static Source<T, NotUsed> UnfoldResourceValueTaskAsync<T,


Nitpick / question: can we call this UnfoldResourceAsync and overload the other call or is there going to be some conflict with Task / ValueTask conversion?

Mayyyyybe?

Biggest concern off the top of my head, is that it may be easy to accidentally wind up with the Task variant, i.e.

Source.UnfoldResourceAsync( () => inThing.OpenAsync(), //Is Task (r) => r.ReadAsync(), //Is ValueTask r => r.DisposeAsync() // is ValueTask

Above should(?) give a compiler error.
But below, need to verify it would not wind up using Task variant:

Source.UnfoldResourceAsync( async () => return await inThing.OpenAsync(), //Is Task async (r) => return await r.ReadAsync(), //Is ValueTask async r => return await r.DisposeAsync() // is ValueTask

Aaronontheweb · 2024-01-03T22:36:01Z

src/core/Akka.Streams/Implementation/Fusing/Ops.cs

@@ -2551,7 +2907,7 @@ public void Invoke(Result<T> result)
                }
            }

-            private static readonly Result<TOut> NotYetThere = Result.Failure<TOut>(new Exception());
+            private static readonly Result<TOut> NotYetThere = Result.Failure<TOut>(NotYetThereSentinel.Instance);


Aaronontheweb · 2024-01-03T22:37:38Z

src/core/Akka.Streams/Implementation/Fusing/Ops.cs

+            {
+                public Result<T> Element { get; private set; }
+                private readonly Action<Holder<T>> _callback;
+                private ValueTask<T> _pending;


Seems pretty clever to me - I'd love to see a benchmark comparison between this and a normal SelectAsync

Aaronontheweb · 2024-01-03T22:38:52Z

src/core/Akka.Streams/Implementation/Fusing/Ops.cs

+                    var peeker =
+                        Unsafe.As<ValueTask<T>, ValueTaskCheatingPeeker<T>>(
+                            ref valueTask);
+                    if (peeker._obj == null)
+                    {
+                        Invoke(Result.Success(peeker._result));
+                    }
+                    else if (peeker._obj is Task<T> asTask)
+                    {
+                        asTask.ContinueWith(TaskCompletedAction, this,
+                            TaskContinuationOptions.NotOnCanceled);
+                    }
+                    else
+                    {
+                        _pending = vt;
+                        var source =
+                            Unsafe.As<IValueTaskSource<T>>(peeker._obj);
+                        source.OnCompleted(OnCompletedAction, this,
+                            peeker._token,
+                            ValueTaskSourceOnCompletedFlags.None);
+                    }


To use Unsafe.As, do we have to set an attribute on the assembly? I think we do this for some unsafe stuff inside Akka.Remote already.

Aaronontheweb · 2024-01-03T22:41:52Z

src/core/Akka.Streams/Implementation/Fusing/Ops.cs

+    /// <typeparam name="TOut">TBD</typeparam>
+    [InternalApi]
+    public sealed class
+        SelectValueTaskAsync<TIn, TOut> : GraphStage<FlowShape<TIn, TOut>>


Same nitpicks about naming

1.5 points here:

The class itself, will almost certainly require a different name from the original
1.5. As for the DSL, Will see whether having the same exposed name causes issues; in this (i.e. as opposed to UnfoldResource) case I'm more worried about compiler being confused as to which overload to use and diminish dev experience.

Per discord comments giving the DSL methods the same name results in compiler confusion due to inability to auto-resolve inlined async Func, Happy to give DSL a better name though and open to options. :)

Aaronontheweb · 2024-01-03T22:43:58Z

src/core/Akka.Streams/Implementation/Sources.cs

+            private readonly PooledValueTaskContinuationHelper<Option<TOut>>
+                _pooledContinuation;


I'd stick with one implementation pattern for this - I think the Holder pattern is easier to reason about so far but I haven't had to debug any of this code yet :p

to11mtm · 2024-01-07T22:14:31Z

ValueTask versions of SelectAsync seem to be working and I got to where I'm happy with the improvements while avoiding Unsafe.As and just using .GetAwaiter().OnCompleted(Action a):

Method	Mean	Error	StdDev	Gen0	Allocated
RunSelectAsync	44.53 us	0.874 us	1.196 us	3.9063	17.96 KB
RunSelectValueTaskAsync	40.18 us	0.589 us	0.551 us	0.7935	3.76 KB
RunSelectAsyncSync	40.14 us	0.507 us	0.450 us	3.9063	17.96 KB
RunSelectValueTaskAsyncSync	36.14 us	0.415 us	0.388 us	0.7935	3.76 KB

The key to getting a clear perf benefit was having a readonly struct SlimResult<T> in place of normal Akka.Util.Result<T>. Getting rid of the boolean and instead preferring to use the Exception field's state as a status sentinel.

src/core/Akka.Streams/Implementation/Sources.cs

…rtunities still...

to11mtm · 2024-02-21T02:41:59Z

New benchmarks after rebase and clearing Rider caches.

Also IDK why I couldn't reply directly, but Unsafe.As is in System.Runtime.CompilerServices (I think) but in general we are good.

Note the benchmarks are... probably imperfect, (and need far better names,) but are fair in that they compare between each in the same way:

BenchmarkDotNet v0.13.12, Windows 10 (10.0.19045.4046/22H2/2022Update)
Intel Core i7-8750H CPU 2.20GHz (Coffee Lake), 1 CPU, 12 logical and 6 physical cores
.NET SDK 8.0.101
  [Host]     : .NET 8.0.1 (8.0.123.58001), X64 RyuJIT AVX2
  DefaultJob : .NET 8.0.1 (8.0.123.58001), X64 RyuJIT AVX2

`Select`

I'm not unhappy...

Method	Mean	Error	StdDev	Gen0	Allocated
RunSelectAsync	33.21 us	0.661 us	0.989 us	3.9063	17.94 KB
RunSelectValueTaskAsync	29.68 us	0.341 us	0.319 us	0.7935	3.74 KB
RunSelectAsyncSync	32.13 us	0.637 us	1.064 us	3.9063	17.94 KB
RunSelectValueTaskAsyncSync	30.27 us	0.553 us	0.490 us	0.7935	3.74 KB

`Unfold`

Very happy here; we are clearly faster and with somewhat/greatly lowered allocation:

Method	Mean	Error	StdDev	Gen0	Allocated
UnfoldAsyncNoYield	176.07 us	2.020 us	1.791 us	9.7656	45.23 KB
UnfoldValueTaskAsyncNoYield	136.77 us	2.715 us	2.788 us	7.3242	33.38 KB
UnfoldAsyncWithYield	161.83 us	1.198 us	1.062 us	8.5449	38.99 KB
UnfoldValueTaskAsyncWithYield	69.99 us	0.479 us	0.448 us	1.5869	7.37 KB

to11mtm · 2024-02-21T02:43:02Z

src/core/Akka.Streams/Implementation/PooledAwaitOutGraphStageLogic.cs

+/// Inheritors are expected to utilize the <see cref="SetPooledCompletionCallback"/>
+/// and call `base.PreStart()` in their `PreStart` conditions.
+/// <para/>
+/// Additionally, if inheritors have their own 'restart' logic,
+/// They should utilize the `ResetHolder()` method,
+/// to avoid callback clashes.
+///  
+/// </summary>
+/// <typeparam name="T"></typeparam>
+internal abstract class PooledAwaitOutGraphStageLogic<T> : OutGraphStageLogic


This was created based on desire to consolidate logic.

It works, but it feels clunky. Not sure what we can do to make the API cleaner?

to11mtm · 2024-02-21T02:47:32Z

src/core/Akka.Streams/Implementation/Fusing/Ops.cs

+            {
+                public Result<T> Element { get; private set; }
+                private readonly Action<Holder<T>> _callback;
+                private ValueTask<T> _pending;


Latest benchmarks are in comments, It's 5-10% faster and improved alloc!

to11mtm · 2024-02-21T02:52:00Z

src/core/Akka.Streams/Implementation/Fusing/Ops.cs

@@ -3805,7 +4124,7 @@ public sealed class AsyncEnumerable<T> : GraphStage<SourceShape<T>>
    {
        #region internal classes

-        private sealed class Logic : OutGraphStageLogic
+        private sealed class Logic : PooledAwaitOutGraphStageLogic<bool>


In the words of GL, "I May have gone too far".

I don't have benchmarks, Can try to make something and diff against dev (although if someone else wants to 😇) but:

90% sure this is better than what we had

100% sure it's less less LOC and vaguely cleaner.

to11mtm · 2024-02-21T02:56:56Z

src/core/Akka.Streams/Implementation/Fusing/SlimResult.cs

+
+namespace Akka.Streams.Implementation.Fusing;
+
+public readonly struct SlimResult<T>


The existing Akka Result<T> type has some pain points AFA internals

Primarily, The structure results in poor alignment, due to the bool/<T>/Exception layout.

What this does instead, is we use Sentinel Exceptions (similar to Channel<T> internals) to track other states as required. This helps on alignment and overall buffer allocation.

to11mtm · 2024-02-21T03:04:08Z

src/core/Akka.Streams/Implementation/UnsafeSlimHolder.cs

+            var whyMSFTwhy = _vt.ConfigureAwait(false);
+            _vt = Unsafe.As<ConfiguredValueTaskAwaitable<T>, ValueTask<T>>(
+                ref whyMSFTwhy);


Someone please suggest a better name, I could not think of one after comprehending that this is all more or less legal but normally only internals are allowed to do directly =/.

Add UnfoldResourceAsync benchies

to11mtm · 2024-02-21T23:22:06Z

I'm very happy.

Method	Mean	Error	StdDev	Gen0	Allocated
UnfoldResourceAsyncNoYield	262.13 us	5.220 us	9.142 us	16.1133	74.92 KB
UnfoldResourceValueTaskAsyncNoYield	130.76 us	2.579 us	4.968 us	6.1035	28.65 KB
UnfoldResourceAsyncWithYield	233.87 us	4.499 us	6.595 us	15.1367	68.67 KB
UnfoldResourceValueTaskAsyncWithYield	70.88 us	1.378 us	1.531 us	1.5869	7.22 KB

Fix SlimResult badness ValueType Error pass in. Add Convenience methods for SlimResult, avoid branching. Add guarding around SelectValueTaskAsync Holder pool usage with apology

to11mtm · 2024-03-03T19:52:48Z

'Ported' the existing FlowSelectAsyncSpec over, IDK how I didn't do that, ~~will double check that all tests are present before I mark ready for review again. 🙃 ~~ (Test cases present now)

There's still an improvement in numbers, but we lost a bit with guard code and these allocation savings are a 'best case' as they hit the happy path, we can almost certainly improve in future however. :) Alas it's a bit of weaving and don't want the API goodness to get lost in the weeds of optimizations.

SelectAsync:

Method	Mean	Error	StdDev	Gen0	Allocated
RunSelectAsync	33.41 us	0.398 us	0.332 us	3.9063	17.94 KB
RunSelectValueTaskAsync	30.25 us	0.353 us	0.330 us	0.7935	3.74 KB
RunSelectAsyncSync	31.35 us	0.440 us	0.412 us	3.9063	17.94 KB
RunSelectValueTaskAsyncSync	28.53 us	0.456 us	0.427 us	0.7935	3.74 KB

Add UnfoldValueTaskAsync test based on UnfoldAsync test.

to11mtm · 2024-03-04T01:07:20Z

Tests are passing locally but a couple may be flaky on CI.

Hoping to see what Linux tests will do once we solve the build errors tripping up ValueTask resolution between mscorlib and System.Threading.Tasks.Extensions. Moving the ValueTask Extensions to Akka.Streams.Util did not help overall (but I think it's worth keeping them over there.)

to11mtm

(Edited due to Weird draft I couldn't get rid of, apologies!)

I think this is good short of a review and approval from others.

Fairly convinced the new failing test(s) are racy, but left it in for discussion/pushback.

to11mtm commented Jan 1, 2024

View reviewed changes

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to11mtm commented Jan 2, 2024

View reviewed changes

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to11mtm commented Jan 8, 2024

View reviewed changes

src/core/Akka.Streams/Implementation/Sources.cs Outdated Show resolved Hide resolved

to11mtm added 7 commits February 20, 2024 20:48

Add UnfoldResource ValueTask Stage and DSL methods

5c3c94a

Pool Continuations on ValueTasks

b0969f8

Add SelectValueTaskAsync

f4725aa

UnfoldValueTaskAsync, clean up other ops

9d87f8b

SelectValueTaskAsync Fixes, Benchmarks

7beabc3

More SlimResult, Standardize patterns

1971702

Consolidate and simplify pooling for simple cases. Probably many oppo…

0471a58

…rtunities still...

to11mtm force-pushed the streams-valuetask-unfoldresource branch from 26a5854 to 0471a58 Compare February 21, 2024 01:53

to11mtm commented Feb 21, 2024

View reviewed changes

Fix derp on UnfoldAsync from bench local playtime

ed982eb

Add UnfoldResourceAsync benchies

to11mtm added 5 commits February 22, 2024 20:58

Improve benchmark names

6b869db

undo AsyncEnumerable change for now.

c1598c0

API Docs

3e4518b

Update Stream docs

026ce51

Fix doc linting

14eb3eb

to11mtm marked this pull request as ready for review February 23, 2024 21:38

to11mtm mentioned this pull request Feb 24, 2024

Add nats-net-v2 Connectors akkadotnet/Alpakka#1860

Open

to11mtm marked this pull request as draft March 3, 2024 03:12

to11mtm added 2 commits March 3, 2024 14:33

Add FlowSelectValueTaskAsyncSpec

a252f8c

Fix SlimResult badness ValueType Error pass in. Add Convenience methods for SlimResult, avoid branching. Add guarding around SelectValueTaskAsync Holder pool usage with apology

Optimize SlimResult.ForSuccess codegen

1a1d428

Add UnfoldResourceValueTaskAsyncSourceSpec

12602da

Add UnfoldValueTaskAsync test based on UnfoldAsync test.

to11mtm added 6 commits March 3, 2024 15:15

Use correct Reactive Streams Exception.

8b7856a

Fix using derp

50bec19

APIDocs

a2a650c

Do some props and proj voodoo to try to fix weird linux build issue

973c8b6

ApiDocs for framework

827d76e

Merge branch 'dev' into streams-valuetask-unfoldresource

25f0501

to11mtm marked this pull request as ready for review March 3, 2024 23:37

Make TaskHelperExts internal in Akka streams

125771a

Maybe don't do 471 on non nt?

aff7e32

to11mtm commented Mar 4, 2024

View reviewed changes

Merge branch 'dev' into streams-valuetask-unfoldresource

cfbab88

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Add UnfoldResource ValueTask Stage and DSL methods #7028

Add UnfoldResource ValueTask Stage and DSL methods #7028

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		private readonly PooledValueTaskContinuationHelper<Option<TOut>>
		_pooledContinuation;


		namespace Akka.Streams.Implementation.Fusing;

		public readonly struct SlimResult<T>

Add UnfoldResource ValueTask Stage and DSL methods #7028

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Add UnfoldResource ValueTask Stage and DSL methods #7028

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"Magic"

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Select

Unfold

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SelectAsync:

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`Select`

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