Implement benchmark for looking up FileStore of a given Path
Results on Mac OS 10.14.6 using APFS: Result "org.eclipse.jgit.benchmarks.LookupFileStoreBenchmark.testLookupFileStore": 44583.277 ±(99.9%) 2666.096 ns/op [Average] (min, avg, max) = (43707.073, 44583.277, 45320.685), stdev = 692.377 CI (99.9%): [41917.181, 47249.373] (assumes normal distribution) Secondary result "org.eclipse.jgit.benchmarks.LookupFileStoreBenchmark.testLookupFileStore:·stack": Stack profiler: ....[Thread state distributions]........................................................ 100.0% RUNNABLE ....[Thread state: RUNNABLE]............................................................. 42.5% 42.5% sun.nio.fs.UnixNativeDispatcher.realpath0 37.9% 37.9% sun.nio.fs.UnixNativeDispatcher.stat0 11.0% 11.0% sun.nio.fs.BsdNativeDispatcher.getfsstat 7.6% 7.6% sun.nio.fs.BsdNativeDispatcher.fsstatEntry 0.7% 0.7% sun.nio.fs.BsdNativeDispatcher.endfsstat 0.1% 0.1% sun.nio.fs.UnixPath.initOffsets 0.0% 0.0% sun.nio.fs.UnixFileAttributes.get 0.0% 0.0% java.util.zip.Inflater.inflateBytes 0.0% 0.0% sun.misc.Unsafe.compareAndSwapInt 0.0% 0.0% sun.nio.fs.BsdFileStore.findMountEntry This shows that FS.attrCacheByPath should be useful to reduce overhead of looking up the FileStore of a given file. Change-Id: I7213086b42e0453f0ee149660d507dac2a4644cc Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
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/*
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* Copyright (C) 2019, Matthias Sohn <matthias.sohn@sap.com>
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* and other copyright owners as documented in the project's IP log.
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*
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* This program and the accompanying materials are made available
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* under the terms of the Eclipse Distribution License v1.0 which
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* accompanies this distribution, is reproduced below, and is
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* - Neither the name of the Eclipse Foundation, Inc. nor the
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* names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.eclipse.jgit.benchmarks;
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import java.io.IOException;
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import java.nio.file.FileStore;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.concurrent.TimeUnit;
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import org.eclipse.jgit.util.FileUtils;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.TearDown;
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import org.openjdk.jmh.profile.StackProfiler;
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import org.openjdk.jmh.runner.Runner;
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import org.openjdk.jmh.runner.RunnerException;
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import org.openjdk.jmh.runner.options.Options;
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import org.openjdk.jmh.runner.options.OptionsBuilder;
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@State(Scope.Thread)
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public class LookupFileStoreBenchmark {
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Path path;
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@Setup
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public void setupBenchmark() throws IOException {
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path = Files.createTempFile("test", "x");
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}
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@TearDown
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public void teardown() throws IOException {
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FileUtils.delete(path.toFile(), FileUtils.RETRY);
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}
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@Benchmark
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@BenchmarkMode({ Mode.AverageTime })
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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public FileStore testLookupFileStore() throws IOException {
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FileStore fs = Files.getFileStore(path);
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return fs;
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}
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public static void main(String[] args) throws RunnerException {
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Options opt = new OptionsBuilder()
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.include(LookupFileStoreBenchmark.class.getSimpleName())
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.addProfiler(StackProfiler.class)
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// .addProfiler(GCProfiler.class)
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.forks(1).jvmArgs("-ea").build();
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new Runner(opt).run();
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}
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}
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