test/run: limit parallelism to 1 for cross-exec builds

This matters for NaCl, which seems to swamp my 4-core MacBook Pro otherwise.
It's not a correctness problem, just a usability problem.

LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://golang.org/cl/98600046

diff --git a/test/run.go b/test/run.go
index c96e37dba00654ebbf6eadd92af7c7d9cdec7d25..a8d4baa3ac8d97f546a632ea54b655bcda206f71 100644 (file)
--- a/test/run.go
+++ b/test/run.go
@@ -71,15 +71,15 @@ const maxTests = 5000
 func main() {
        flag.Parse()
 
-       // Disable parallelism if printing
-       if *verbose {
-               *numParallel = 1
-       }
-
        goos = os.Getenv("GOOS")
        goarch = os.Getenv("GOARCH")
        findExecCmd()
 
+       // Disable parallelism if printing or if using a simulator.
+       if *verbose || len(findExecCmd()) > 0 {
+               *numParallel = 1
+       }
+
        ratec = make(chan bool, *numParallel)
        rungatec = make(chan bool, *runoutputLimit)
        var err error