Run auto GC in the background
When running an automatic GC on a FileRepository, when the caller
passes a NullProgressMonitor, run the GC in a background thread. Use a
thread pool of size 1 to limit the number of background threads spawned
for background gc in the same application. In the next minor release we
can make the thread pool configurable.
In some cases, the auto GC limit is lower than the true number of
unreachable loose objects, so auto GC will run after every (e.g) fetch
operation. This leads to the appearance of poor fetch performance.
Since these GCs will never make progress (until either the objects
become referenced, or the two week timeout expires), blocking on them
simply reduces throughput.
In the event that an auto GC would make progress, it's still OK if it
runs in the background. The progress will still happen.
This matches the behavior of regular git.
Git (and now jgit) uses the lock file for gc.log to prevent simultaneous
runs of background gc. Further, it writes errors to gc.log, and won't
run background gc if that file is present and recent. If gc.log is too
old (according to the config gc.logexpiry), it will be ignored.
Change-Id: I3870cadb4a0a6763feff252e6eaef99f4aa8d0df
Signed-off-by: David Turner <dturner@twosigma.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com> 7 년 전 |
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- /*
- * Copyright (C) 2012, 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.pgm;
-
- import static org.junit.Assert.assertEquals;
-
- import java.util.ArrayList;
- import java.util.Arrays;
- import java.util.List;
-
- import org.eclipse.jgit.api.Git;
- import org.eclipse.jgit.lib.CLIRepositoryTestCase;
- import org.eclipse.jgit.util.FS;
- import org.eclipse.jgit.util.SystemReader;
- import org.junit.Before;
- import org.junit.Test;
-
- public class ConfigTest extends CLIRepositoryTestCase {
- @Override
- @Before
- public void setUp() throws Exception {
- super.setUp();
- try (Git git = new Git(db)) {
- git.commit().setMessage("initial commit").call();
- }
- }
-
- @Test
- public void testListConfig() throws Exception {
- boolean isWindows = SystemReader.getInstance().getProperty("os.name")
- .startsWith("Windows");
- boolean isMac = SystemReader.getInstance().getProperty("os.name")
- .equals("Mac OS X");
-
- String[] output = execute("git config --list");
- List<String> expect = new ArrayList<>();
- expect.add("gc.autoDetach=false");
- expect.add("core.filemode=" + !isWindows);
- expect.add("core.logallrefupdates=true");
- if (isMac)
- expect.add("core.precomposeunicode=true");
- expect.add("core.repositoryformatversion=0");
- if (!FS.DETECTED.supportsSymlinks())
- expect.add("core.symlinks=false");
- expect.add(""); // ends with LF (last line empty)
- assertEquals("expected default configuration",
- Arrays.asList(expect.toArray()).toString(),
- Arrays.asList(output).toString());
- }
-
- }
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