[chore] set GOMAXPROCS for collector subprocess (#27449)

Alex Boten · web-flow · commit dd8e010829c5 · 2023-10-05T10:21:49.000-07:00
This will result in more consistent benchmarks across different environments. Fixes #27429 Signed-off-by: Alex Boten <aboten@lightstep.com>
diff --git a/testbed/testbed/child_process_collector.go b/testbed/testbed/child_process_collector.go
@@ -204,6 +204,9 @@ func (cp *childProcessCollector) Start(params StartParams) error {
 	}
 	// #nosec
 	cp.cmd = exec.Command(exePath, args...)
+	cp.cmd.Env = append(os.Environ(),
+		"GOMAXPROCS=2",
+	)
 
 	// Capture standard output and standard error.
 	cp.cmd.Stdout = logFile

Original file line number	Diff line number	Diff line change
`@@ -204,6 +204,9 @@ func (cp *childProcessCollector) Start(params StartParams) error {`
`204`	`204`	`}`
`205`	`205`	`// #nosec`
`206`	`206`	`cp.cmd = exec.Command(exePath, args...)`
	`207`	`+ cp.cmd.Env = append(os.Environ(),`
	`208`	`+ "GOMAXPROCS=2",`
	`209`	`+ )`
`207`	`210`
`208`	`211`	`// Capture standard output and standard error.`
`209`	`212`	`cp.cmd.Stdout = logFile`