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Allow profiling Soong from the full build

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Test: treehugger
Change-Id: I5112364fff635b856a55744457f547d3eba91391
This commit is contained in:
Sasha Smundak 2022-11-18 15:32:49 -08:00
parent 6f235d9b39
commit faa97b7eb9
2 changed files with 23 additions and 4 deletions
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19
docs/perf.md
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@ -49,9 +49,22 @@ in the build graph will improve total build times.
### Soong
Soong can be traced and profiled using the standard Go tools. It understands
the `-cpuprofile`, `-trace`, and `-memprofile` command line arguments, but we
don't currently have an easy way to enable them in the context of a full build.
Soong proper (i.e., `soong_build` executable that processes the blueprint
files) can be traced and profiled using the standard Go tools. It understands
the `-trace`, `-cpuprofile`, and `-memprofile` command line arguments.
Setting `SOONG_PROFILE_CPU` and/or `SOONG_PROFILE_MEM` environment variables
for the build enables respective profiling, e.g., running
```shell
SOONG_PROFILE_CPU=/tmp/foo m ..._
```
saves CPU profile for each Soong invocation in /tmp/foo._step_ file, where
_step_ is Soong execution step. The main step is `build`. The others as
`bp2build_files`, `bp2build_workspace`, `modulegraph`, `queryview`,
`api_bp2build`, `soong_docs` (not all of them necessarily run during the build).
The profiles can be inspected with `go tool pprof` from the command line or
with _Run>Open Profiler Snapshot_ in IntelliJ IDEA.
### Kati

6
ui/build/soong.go
View file

@ -195,6 +195,12 @@ func primaryBuilderInvocation(
allArgs = append(allArgs, commonArgs...)
allArgs = append(allArgs, environmentArgs(config, name)...)
if profileCpu := os.Getenv("SOONG_PROFILE_CPU"); profileCpu != "" {
allArgs = append(allArgs, "--cpuprofile", profileCpu+"."+name)
}
if profileMem := os.Getenv("SOONG_PROFILE_MEM"); profileMem != "" {
allArgs = append(allArgs, "--memprofile", profileMem+"."+name)
}
allArgs = append(allArgs, "Android.bp")
return bootstrap.PrimaryBuilderInvocation{