change parallelization in code

hack/jenkins/osx_integration_tests_docker.sh

@@ -30,7 +30,7 @@ ARCH="amd64"
 OS="darwin"
 DRIVER="docker"
 JOB_NAME="Docker_macOS"
-EXTRA_TEST_ARGS="-test.parallel=2"
+EXTRA_TEST_ARGS=""
 EXPECTED_DEFAULT_DRIVER="docker"
 EXTERNAL="yes"
 

hack/jenkins/osx_integration_tests_hyperkit.sh

@@ -30,7 +30,7 @@ ARCH="amd64"
 OS="darwin"
 DRIVER="hyperkit"
 JOB_NAME="Hyperkit_macOS"
-EXTRA_TEST_ARGS="-test.parallel=2"
+EXTRA_TEST_ARGS=""
 EXPECTED_DEFAULT_DRIVER="hyperkit"
 EXTERNAL="yes"
 

test/integration/main_test.go

@@ -97,6 +97,11 @@ func setMaxParallelism() {
 	// Each "minikube start" consumes up to 2 cores, though the average usage is somewhat lower
 	limit := int(math.Floor(float64(maxp) / 1.75))
 
+	// cut the number of parallel tests in half for macOS
+	if runtime.GOOS == "darwin" && limit > 2 {
+		limit /= 2
+	}
+
 	fmt.Fprintf(os.Stderr, "Found %d cores, limiting parallelism with --test.parallel=%d\n", maxp, limit)
 	if err := flag.Set("test.parallel", strconv.Itoa(limit)); err != nil {
 		fmt.Fprintf(os.Stderr, "Unable to set test.parallel: %v\n", err)