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Code Issues Releases Wiki Activity

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. Replace calls to `inferno` with `flamegraph.pl` if necessary.
1. *Optional* Enable profiling without `root` access: 2. *Optional* Enable profiling without `root` access:
```sh ```sh
echo -1 | sudo tee /proc/sys/kernel/perf_event_paranoid echo -1 | sudo tee /proc/sys/kernel/perf_event_paranoid
echo 0 | sudo tee /proc/sys/kernel/nmi_watchdog 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 ```sh
cd ~/Path/to/bind9/checkout cd ~/Path/to/bind9/checkout
@@ -30,13 +30,13 @@ cd ~/Path/to/bind9/checkout
make clean && make 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 ```sh
make install make install
``` ```
3. Run `named` under `perf`. 5. Run `named` under `perf`.
```sh ```sh
perf record --compression-level=1 --user-callchains -g --call-graph=dwarf,65528 -e cycles:ppp --output=$OUTPUT_FILE -- $YOUR_NAMED_CMDLINE_GOES_HERE perf record --compression-level=1 --user-callchains -g --call-graph=dwarf,65528 -e cycles:ppp --output=$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. `--output=$OUTPUT_FILE` Name of the output file. Otherwise it defaults to perf.data.
4. Generate a flamegraph with `inferno`: 6. Generate a flamegraph with `inferno`:
```sh ```sh
perf script --input=$INPUT_DATA | inferno-collapse-perf | inferno-flamegraph --width=1920 > $OUTPUT_SVG perf script --input=$INPUT_DATA | inferno-collapse-perf | inferno-flamegraph --width=1920 > $OUTPUT_SVG