org.spearce.jgit.test/exttst/org/spearce/jgit/lib/T0005_ShallowSpeedTest.java

   1 /*
   2  *  Copyright (C) 2006  Robin Rosenberg <robin.rosenberg@dewire.com>
   3  *
   4  *  This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Lesser General Public
   6  *  License, version 2.1, as published by the Free Software Foundation.
   7  *
   8  *  This library is distributed in the hope that it will be useful,
   9  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  *  Lesser General Public License for more details.
  12  *
  13  *  You should have received a copy of the GNU Lesser General Public
  14  *  License along with this library; if not, write to the Free Software
  15  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
  16  */
  17 package org.spearce.jgit.lib;
  18
  19 import java.io.File;
  20 import java.io.IOException;
  21
  22 import junit.textui.TestRunner;
  23
  24 public class T0005_ShallowSpeedTest extends SpeedTestBase {
  25
  26         protected void setUp() throws Exception {
  27                 prepare(new String[] { "git", "rev-list", "365bbe0d0caaf2ba74d56556827babf0bc66965d" });
  28         }
  29
  30         public void testShallowHistoryScan() throws IOException {
  31                 long start = System.currentTimeMillis();
  32                 Repository db = new Repository(new File(kernelrepo));
  33                 Commit commit = db.mapCommit("365bbe0d0caaf2ba74d56556827babf0bc66965d");
  34                 int n = 1;
  35                 for (;;) {
  36                         ObjectId[] parents = commit.getParentIds();
  37                         if (parents.length == 0)
  38                                 break;
  39                         ObjectId parentId = parents[0];
  40                         commit = db.mapCommit(parentId);
  41                         commit.getCommitId().toString();
  42                         ++n;
  43                 }
  44                 assertEquals(12275, n);
  45                 long stop = System.currentTimeMillis();
  46                 long time = stop - start;
  47                 System.out.println("native="+nativeTime);
  48                 System.out.println("jgit="+time);
  49                 // ~0.750s (hot cache), ok
  50                 /*
  51 native=1795
  52 jgit=722
  53                  */
  54                 // native git seems to run SLOWER than jgit here, at roughly half the speed
  55                 // creating the git process is not the issue here, btw.
  56                 long factor10 = (nativeTime*150/time+50)/100;
  57                 assertEquals(3, factor10);
  58         }
  59
  60         public static void main(String[] args) {
  61                 TestRunner.run(T0005_ShallowSpeedTest.class);
  62         }
  63 }