Bodigrim/tasty-bench
1
1
Fork 0
mirror of https://github.com/Bodigrim/tasty-bench.git synced 2024-09-11 08:45:33 +03:00
Code Issues Projects Releases Wiki Activity

Recommend -fproc-alignment

Browse Source
This commit is contained in:
Bodigrim 2023-02-11 01:26:48 +00:00
parent 516eba6f1a
commit 4de2fd63d9
2 changed files with 18 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
README.md
View File

@ -93,6 +93,8 @@ benchmark bench-fibo
type: exitcode-stdio-1.0
build-depends: base, tasty-bench
ghc-options: "-with-rtsopts=-A32m"
if impl(ghc >= 8.6)
ghc-options: -fproc-alignment=64
```
And here is `BenchFibo.hs`:
@ -398,8 +400,13 @@ and that benchmark names do not contain newlines.
## Comparison against baseline
One can compare benchmark results against an earlier baseline in an automatic way.
To use this feature, first run `tasty-bench` with `--csv FILE` key
One can compare benchmark results against an earlier run in an automatic way.
When using this feature, it's especially important to compile benchmarks with
`ghc-options: `[`-fproc-alignment`](https://downloads.haskell.org/ghc/latest/docs/users_guide/debugging.html#ghc-flag--fproc-alignment)`=64`, otherwise results could be skewed by
intermittent changes in cache-line alignment.
Firstly, run `tasty-bench` with `--csv FILE` key
to dump results to `FILE` in CSV format
(it could be a good idea to set smaller `--stdev`, if possible):

11
src/Test/Tasty/Bench.hs
View File

@ -75,6 +75,8 @@ Benchmarks are declared in a separate section of @cabal@ file:
> type: exitcode-stdio-1.0
> build-depends: base, tasty-bench
> ghc-options: "-with-rtsopts=-A32m"
> if impl(ghc >= 8.6)
> ghc-options: -fproc-alignment=64
And here is @BenchFibo.hs@:
@ -360,8 +362,13 @@ and that benchmark names do not contain newlines.
=== Comparison against baseline
One can compare benchmark results against an earlier baseline in an
automatic way. To use this feature, first run @tasty-bench@ with
One can compare benchmark results against an earlier run in an automatic way.
When using this feature, it's especially important to compile benchmarks with
@ghc-options:@ [@-fproc-alignment@](https://downloads.haskell.org/ghc/latest/docs/users_guide/debugging.html#ghc-flag--fproc-alignment)@=64@, otherwise results could be skewed by
intermittent changes in cache-line alignment.
Firstly, run @tasty-bench@ with
@--csv@ @FILE@ key to dump results to @FILE@ in CSV format
(it could be a good idea to set smaller @--stdev@, if possible):