Remove manual setting of GOMAXPROCS in main.go.

This is no longer necessary since go 1.5 does it by default.

main.go

@@ -23,24 +23,14 @@ import (
 	"fmt"
 	"math/rand"
 	"os"
-	"runtime"
 
 	"github.com/cockroachdb/cockroach/cli"
-	"github.com/cockroachdb/cockroach/util/log"
 	"github.com/cockroachdb/cockroach/util/randutil"
 )
 
 func main() {
-	// Instruct Go to use all CPU cores.
-	// TODO(spencer): this may be excessive and result in worse
-	// performance. We should keep an eye on this as we move to
-	// production workloads.
-	numCPU := runtime.NumCPU()
-	runtime.GOMAXPROCS(numCPU)
+	// Seed the math/rand RNG from crypto/rand.
 	rand.Seed(randutil.NewPseudoSeed())
-	if log.V(1) {
-		log.Infof("running using %d processor cores", numCPU)
-	}
 
 	if len(os.Args) == 1 {
 		os.Args = append(os.Args, "help")