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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>
stable-5.1
Matthias Sohn 5 years ago
parent
commit
25a611ccc5
  1. 97
      org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/LookupFileStoreBenchmark.java

97
org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/LookupFileStoreBenchmark.java

@ -0,0 +1,97 @@
/*
* Copyright (C) 2019, Matthias Sohn <matthias.sohn@sap.com>
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.benchmarks;
import java.io.IOException;
import java.nio.file.FileStore;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.concurrent.TimeUnit;
import org.eclipse.jgit.util.FileUtils;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.TearDown;
import org.openjdk.jmh.profile.StackProfiler;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;
@State(Scope.Thread)
public class LookupFileStoreBenchmark {
Path path;
@Setup
public void setupBenchmark() throws IOException {
path = Files.createTempFile("test", "x");
}
@TearDown
public void teardown() throws IOException {
FileUtils.delete(path.toFile(), FileUtils.RETRY);
}
@Benchmark
@BenchmarkMode({ Mode.AverageTime })
@OutputTimeUnit(TimeUnit.NANOSECONDS)
public FileStore testLookupFileStore() throws IOException {
FileStore fs = Files.getFileStore(path);
return fs;
}
public static void main(String[] args) throws RunnerException {
Options opt = new OptionsBuilder()
.include(LookupFileStoreBenchmark.class.getSimpleName())
.addProfiler(StackProfiler.class)
// .addProfiler(GCProfiler.class)
.forks(1).jvmArgs("-ea").build();
new Runner(opt).run();
}
}
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