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Update CPU profiling using perf

Alessio Podda 2024-12-02 07:44:07 +00:00
parent 94d28d9a64
commit 3ab22d5d13
1 changed files with 5 additions and 5 deletions
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10
CPU-profiling-using-perf.md

@ -15,14 +15,14 @@ sudo dnf install perf flamegraph
Replace calls to `inferno` with `flamegraph.pl` if necessary.
1. *Optional* Enable profiling without `root` access:
2. *Optional* Enable profiling without `root` access:
```sh
echo -1 | sudo tee /proc/sys/kernel/perf_event_paranoid
echo 0 | sudo tee /proc/sys/kernel/nmi_watchdog
```
1. Ensure you have compiled `named` with debug symbols. Optionally, set up a prefix
3. Ensure you have compiled `named` with debug symbols. Optionally, set up a prefix
```sh
cd ~/Path/to/bind9/checkout
@ -30,13 +30,13 @@ cd ~/Path/to/bind9/checkout
make clean && make
```
2. Install `named`. Normally `libtool` runs `named` through a wrapper shell script that can make perf results more difficult to read.
4. Install `named`. Normally `libtool` runs `named` through a wrapper shell script that can make perf results more difficult to read.
```sh
make install
```
3. Run `named` under `perf`.
5. Run `named` under `perf`.
```sh
perf record --compression-level=1 --user-callchains -g --call-graph=dwarf,65528 -e cycles:ppp --output=$OUTPUT_FILE -- $YOUR_NAMED_CMDLINE_GOES_HERE
```
@ -54,7 +54,7 @@ perf record --compression-level=1 --user-callchains -g --call-graph=dwarf,65528
`--output=$OUTPUT_FILE` Name of the output file. Otherwise it defaults to perf.data.
4. Generate a flamegraph with `inferno`:
6. Generate a flamegraph with `inferno`:
```sh
perf script --input=$INPUT_DATA | inferno-collapse-perf | inferno-flamegraph --width=1920 > $OUTPUT_SVG