// -p n
// the number of programs, such as build commands or
// test binaries, that can be run in parallel.
-// The default is the number of CPUs available.
+// The default is GOMAXPROCS, normally the number of CPUs available.
// -race
// enable data race detection.
// Supported only on linux/amd64, freebsd/amd64, darwin/amd64, windows/amd64,