ziomyslaw / Await.HeadExplosion

Await.HeadExplosion

Value Tasks

BenchmarkDotNet=v0.10.9, OS=Windows 10 Redstone 2 (10.0.15063)
Processor=Intel Core i7-4980HQ CPU 2.80GHz (Haswell), ProcessorCount=8
Frequency=2728070 Hz, Resolution=366.5595 ns, Timer=TSC
.NET Core SDK=2.1.0-preview1-007228
  [Host]     : .NET Core 2.0.0 (Framework 4.6.00001.0), 64bit RyuJIT
  DefaultJob : .NET Core 2.0.0 (Framework 4.6.00001.0), 64bit RyuJIT

Method	Repeats	Mean	Error	StdDev	Median	Scaled	ScaledSD	Gen 0	Allocated
ConsumeTask	100	1,097.1 ns	7.562 ns	7.073 ns	1,098.4 ns	2.79	0.20	1.1539	7272 B
ConsumeValueTaskWrong	100	1,050.5 ns	43.935 ns	41.097 ns	1,035.4 ns	2.68	0.22	-	0 B
ConsumeValueTaskProperly	100	394.6 ns	9.606 ns	28.323 ns	394.7 ns	1.00	0.00	-	0 B
ConsumeValueTaskCrazy	100	359.1 ns	11.959 ns	35.260 ns	354.8 ns	0.91	0.11	-	0 B
ConsumeTask	1000	9,307.1 ns	396.345 ns	1,091.649 ns	9,501.1 ns	2.00	0.60	11.4441	72072 B
ConsumeValueTaskWrong	1000	11,073.7 ns	468.996 ns	1,382.844 ns	10,329.0 ns	2.38	0.73	-	0 B
ConsumeValueTaskProperly	1000	5,075.2 ns	543.450 ns	1,602.374 ns	4,455.4 ns	1.00	0.00	-	0 B
ConsumeValueTaskCrazy	1000	4,140.6 ns	211.741 ns	604.109 ns	4,201.2 ns	0.89	0.28	-	0 B

Task Improvements

Before

BenchmarkDotNet=v0.10.9, OS=Windows 10 Redstone 2 (10.0.15063)
Processor=Intel Core i7-4980HQ CPU 2.80GHz (Haswell), ProcessorCount=8
Frequency=2728070 Hz, Resolution=366.5595 ns, Timer=TSC
.NET Core SDK=2.0.0
  [Host]     : .NET Core 2.0.0 (Framework 4.6.00001.0), 64bit RyuJIT
  Job-MXURVS : .NET Core 2.0.0 (Framework 4.6.00001.0), 64bit RyuJIT

Toolchain=CoreCsProj  

Method	Mean	Error	StdDev	Scaled	Allocated
Return	15.61 ms	0.0150 ms	0.0140 ms	1.00	528 B
Simple	15.61 ms	0.0184 ms	0.0172 ms	1.00	744 B

After

BenchmarkDotNet=v0.10.9, OS=Windows 10 Redstone 2 (10.0.15063)
Processor=Intel Core i7-4980HQ CPU 2.80GHz (Haswell), ProcessorCount=8
Frequency=2728070 Hz, Resolution=366.5595 ns, Timer=TSC
.NET Core SDK=2.1.0-preview1-007228
  [Host]     : .NET Core 2.1.0-preview1-25719-04 (Framework 4.6.25718.02), 64bit RyuJIT
  Job-EGQCNX : .NET Core 2.1.0-preview1-25719-04 (Framework 4.6.25718.02), 64bit RyuJIT

Toolchain=CoreCsProj  

Method	Mean	Error	StdDev	Scaled	Allocated
Return	15.60 ms	0.0213 ms	0.0189 ms	1.00	520 B
Simple	15.60 ms	0.0115 ms	0.0107 ms	1.00	736 B

Links

• Avoid async delegate allocation
• Reduce allocations when async methods yield
• State of the .NET Performance - Adam Sitnik