From 4f72b2c7afb8d27971ca41142e6c15f4a22ddf16 Mon Sep 17 00:00:00 2001 From: Philipp Wollermann Date: Mon, 6 Jun 2016 12:43:01 +0000 Subject: Add --experimental_multi_threaded_digest which lets DigestUtils use multiple threads when calculating the MD5 hash even for large files. Might improve performance when using an SSD. Fixes #835 and #1210. -- MOS_MIGRATED_REVID=124128233 --- .../google/devtools/build/lib/ssd/SsdModule.java | 40 ++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 src/main/java/com/google/devtools/build/lib/ssd/SsdModule.java (limited to 'src/main/java/com/google/devtools/build/lib/ssd/SsdModule.java') diff --git a/src/main/java/com/google/devtools/build/lib/ssd/SsdModule.java b/src/main/java/com/google/devtools/build/lib/ssd/SsdModule.java new file mode 100644 index 0000000000..a41a3baa38 --- /dev/null +++ b/src/main/java/com/google/devtools/build/lib/ssd/SsdModule.java @@ -0,0 +1,40 @@ +// Copyright 2016 The Bazel Authors. All rights reserved. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +package com.google.devtools.build.lib.ssd; + +import com.google.common.collect.ImmutableList; +import com.google.devtools.build.lib.actions.cache.DigestUtils; +import com.google.devtools.build.lib.runtime.BlazeModule; +import com.google.devtools.build.lib.runtime.Command; +import com.google.devtools.common.options.OptionsBase; +import com.google.devtools.common.options.OptionsProvider; + +/** + * BlazeModule that applies optimizations to Bazel's internals in order to improve performance when + * using an SSD. + */ +public final class SsdModule extends BlazeModule { + @Override + public Iterable> getCommandOptions(Command command) { + return ImmutableList.>of(SsdOptions.class); + } + + @Override + public void handleOptions(OptionsProvider optionsProvider) { + SsdOptions options = optionsProvider.getOptions(SsdOptions.class); + if (options.experimentalMultiThreadedDigest) { + DigestUtils.setMultiThreadedDigest(options.experimentalMultiThreadedDigest); + } + } +} -- cgit v1.2.3