commit 74cb8c7d6ae2462006e983b8baafd50c884d1d8d
author Philipp Wollermann <philwo@google.com> Fri Jul 15 14:01:37 2016 +0000
committer Yun Peng <pcloudy@google.com> Mon Jul 18 10:42:10 2016 +0000
tree 0cb370f17072bbecf0f577834b0fbfb3d35ea84f
parent 42d8290f21d5ae836ac2aa65166aa84afda8b872

When running Javac and related tools, use -XX:+TieredCompilation -XX:TieredStopAtLevel=1 instead of -client, as the latter is ignored on 64-bit JVMs since at least JDK 6.

The new flags have been shown to cut down CPU time by 50% due to reduced time spent in JIT and improving overall run time for short running actions, some times also cutting them in half.

--
MOS_MIGRATED_REVID=127536578

tools/jdk/BUILD

diff --git a/tools/jdk/BUILD b/tools/jdk/BUILD
index 96581b0..a62f067 100644
--- a/tools/jdk/BUILD
+++ b/tools/jdk/BUILD
@@ -124,7 +124,10 @@
     ijar = ["@bazel_tools//tools/jdk:ijar"],
     javabuilder = ["//tools/jdk:JavaBuilder_deploy.jar"],
     javac = ["//third_party/java/jdk/langtools:javac_jar"],
-    jvm_opts = ["-client"],
+    jvm_opts = [
+        "-XX:+TieredCompilation",
+        "-XX:TieredStopAtLevel=1",
+    ],
     singlejar = ["//tools/jdk:SingleJar_deploy.jar"],
     source_version = "8",
     target_version = "8",