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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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21
docs/perf.md
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@ -42,16 +42,29 @@ critical path:
```
If the elapsed time is much longer than the critical path then additional
parallelism on the build machine will improve total build times. If there are
parallelism on the build machine will improve total build times. If there are
long individual times listed in the critical path then improving build times
for those steps or adjusting dependencies so that those steps can run earlier
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{