cmd/dist: restrict parallel tests to NumCPU on mips64x

mips64 builder and one machine of the mips64le builder has small amount
of memory. Since CL 18199, they have been running slowly, as more
processes were launched in running 'test' directory, and a lot of swap
were used. This CL brings all.bash from 5h back to 3h on Loongson 2E
with 512 MB memory.

Change-Id: I4a22e239a542a99ba5986753205d8cd1f4b3d3c6
Reviewed-on: https://go-review.googlesource.com/18483
Reviewed-by: Minux Ma <minux@golang.org>
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/cmd/dist/util.go b/src/cmd/dist/util.go
index 1b42954cc3d2be2255abb071f76eeb396af66bde..1b5d1f97b27aac77e7df771ed36928368f4f451e 100644 (file)
--- a/src/cmd/dist/util.go
+++ b/src/cmd/dist/util.go
@@ -461,7 +461,7 @@ func main() {
                }
        }
 
-       if gohostarch == "arm" {
+       if gohostarch == "arm" || gohostarch == "mips64" || gohostarch == "mips64le" {
                maxbg = min(maxbg, runtime.NumCPU())
        }
        bginit()