go/src/cmd/api
Bryan C. Mills 75e79adaf9 cmd/api: limit concurrent 'go list' calls to GOMAXPROCS
Each invocation of 'go list' may consume a significant quantity of
system resources, including buffers for reading files and RAM for the
runtime's memory footprint.
Very small builders may even hit swap as a result of that load,
further exacerbating resource contention.

To avoid overloading small builders, restrict 'go list' calls to
runtime.GOMAXPROCS as it is set at the first call to loadImports.

This also somewhat improves running time even on larger machines: on
my workstation, this change reduces the wall time for 'go test
cmd/api' by around 100ms.

Updates #38537

Change-Id: I968e0f961a8f1d84c27e1ab8b621b9670dcfd448
Reviewed-on: https://go-review.googlesource.com/c/go/+/228998
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2020-04-20 21:23:00 +00:00
..
testdata/src
goapi.go cmd/api: limit concurrent 'go list' calls to GOMAXPROCS 2020-04-20 21:23:00 +00:00
goapi_test.go cmd/dist: remove darwin/386, darwin/arm as valid ports 2020-04-04 16:49:40 +00:00
run.go