This project is built to benchmark C# asynchronous libraries against each other.
These benchmarks are ran using a fork of BenchmarkDotNet where I added the ability to measure survived memory.
This is a non-exhaustive benchmark of each library's features. It is only meant to compare the most common use scenario (awaiting an asynchronous result). Some libraries provide more/different features than others.
Asynchronous libraries benchmarked:
- Built-in callbacks (
System.Action), measured as the baseline - System.Threading.Tasks (TPL),
TaskandValueTask - ProtoPromise v3.3.0
- UniTask v2.5.10
- UnityFx.Async v1.1.0
- RSG Promises v3.0.1
To run the benchmarks on your machine:
- Run
RunAllBenchmarks.bat(or run a script individually for each runtime in theScriptsdirectory). - See your results in the generated
Scripts/BenchmarkDotNet.Artifactsdirectory.
Note:
Some functions are not actually supported in some libraries (like RSG does not support async/await), so they will show as NA or ?.
Callbacks are measured the same for each benchmark as a baseline to compare against, and does not mean you can actually use async/await or ContinueWith with them.
ContinueWith is either using the .ContinueWith API or .Then API, depending on each library.
BenchmarkDotNet v0.14.1-develop (2025-01-27), Windows 10 (10.0.19045.5371/22H2/2022Update)
AMD Ryzen 7 9800X3D 4.70GHz, 1 CPU, 16 logical and 8 physical cores
.NET SDK 9.0.102
[Host] : .NET 8.0.12 (8.0.1224.60305), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
DefaultJob : .NET 8.0.12 (8.0.1224.60305), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
| Type | Method | Pending | Mean | Ratio | Allocated | Survived |
|---|---|---|---|---|---|---|
| AsyncAwait | Callback | False | 43.99 ns | 1.00 | 832 B | - |
| AsyncAwait | ProtoPromise | False | 37.56 ns | 0.85 | - | - |
| AsyncAwait | RsgPromise | False | NA | ? | NA | NA |
| AsyncAwait | Task | False | 49.97 ns | 1.14 | 192 B | - |
| AsyncAwait | UniTask | False | 81.06 ns | 1.84 | - | - |
| AsyncAwait | UnityFxAsync | False | 62.05 ns | 1.41 | 360 B | - |
| AsyncAwait | ValueTask | False | 70.66 ns | 1.61 | - | - |
| AsyncAwait | Callback | True | 52.06 ns | 1.00 | 832 B | - |
| AsyncAwait | ProtoPromise | True | 401.37 ns | 7.71 | - | 624 B |
| AsyncAwait | RsgPromise | True | NA | ? | NA | NA |
| AsyncAwait | Task | True | 455.15 ns | 8.74 | 1120 B | - |
| AsyncAwait | UniTask | True | 478.92 ns | 9.20 | - | 744 B |
| AsyncAwait | UnityFxAsync | True | 433.54 ns | 8.33 | 1952 B | - |
| AsyncAwait | ValueTask | True | 498.24 ns | 9.57 | 968 B | 40 B |
| ContinueWith | Callback | False | 44.91 ns | 1.00 | 832 B | - |
| ContinueWith | ProtoPromise | False | 107.35 ns | 2.39 | - | - |
| ContinueWith | RsgPromise | False | 89.26 ns | 1.99 | 1032 B | - |
| ContinueWith | Task | False | 384.44 ns | 8.56 | 1224 B | - |
| ContinueWith | UniTask | False | 158.15 ns | 3.52 | - | - |
| ContinueWith | UnityFxAsync | False | 319.22 ns | 7.11 | 1304 B | - |
| ContinueWith | ValueTask | False | NA | ? | NA | NA |
| ContinueWith | Callback | True | 53.44 ns | 1.00 | 832 B | - |
| ContinueWith | ProtoPromise | True | 375.57 ns | 7.03 | - | 336 B |
| ContinueWith | RsgPromise | True | 889.53 ns | 16.64 | 10104 B | - |
| ContinueWith | Task | True | 646.31 ns | 12.09 | 1864 B | - |
| ContinueWith | UniTask | True | 720.61 ns | 13.48 | - | 1,296 B |
| ContinueWith | UnityFxAsync | True | 431.36 ns | 8.07 | 1560 B | 16 B |
| ContinueWith | ValueTask | True | NA | ? | NA | NA |