bazel: add --starlark_cpu_profile=<file> flag
And an integration test.
RELNOTES:
The --starlark_cpu_profile=<file> flag writes a profile in
pprof format containing a statistical summary of CPU usage
by all Starlark execution during the bazel command. Use it
to identify slow Starlark functions in loading and analysis.
PiperOrigin-RevId: 293692329
diff --git a/src/main/java/com/google/devtools/build/lib/runtime/CommonCommandOptions.java b/src/main/java/com/google/devtools/build/lib/runtime/CommonCommandOptions.java
index 5fb95f7..0659fe5 100644
--- a/src/main/java/com/google/devtools/build/lib/runtime/CommonCommandOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/runtime/CommonCommandOptions.java
@@ -332,6 +332,14 @@
public PathFragment profilePath;
@Option(
+ name = "starlark_cpu_profile",
+ defaultValue = "",
+ documentationCategory = OptionDocumentationCategory.LOGGING,
+ effectTags = {OptionEffectTag.BAZEL_MONITORING},
+ help = "Writes into the specified file a pprof profile of CPU usage by all Starlark threads.")
+ public String starlarkCpuProfile;
+
+ @Option(
name = "record_full_profiler_data",
defaultValue = "false",
documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
