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ls: document hyperfine script

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Terts Diepraam 2021-04-26 18:36:15 +02:00
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commit 35838dc8a9
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11
src/uu/ls/BENCHMARKING.md
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@ -26,7 +26,15 @@ Example: `hyperfine --warmup 2 "target/release/coreutils ls -al -R tree > /dev/n
`hyperfine --warmup 2 "target/release/coreutils ls -al -R tree > /dev/null" "ls -al -R tree > /dev/null"`
(This assumes GNU ls is installed as `ls`)
This can also be used to compare with version of ls built before your changes to ensure your change does not regress this
This can also be used to compare with version of ls built before your changes to ensure your change does not regress this.
Here is a `bash` script for doing this comparison:
```bash
#!/bin/bash
cargo build --no-default-features --features ls --release
args="$@"
hyperfine "ls $args" "target/release/coreutils ls $args"
```
## Checking system call count
@ -43,7 +51,6 @@ cargo flamegraph --cmd coreutils -- ls [additional parameters]
However, if the `-R` option is given, the output becomes pretty much useless due to recursion. We can fix this by merging all the direct recursive calls with `uniq`, below is a `bash` script that does this.
```bash
#!/bin/bash
cargo build --release --no-default-features --features ls
perf record target/release/coreutils ls "$@"
perf script | uniq | inferno-collapse-perf | inferno-flamegraph > flamegraph.svg