org.spearce.jgit.test/exttst/org/spearce/jgit/lib/T0006_DeepSpeedTest.java

   1 /*
   2  * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
   3  * Copyright (C) 2007, Shawn O. Pearce <spearce@spearce.org>
   4  *
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or
   8  * without modification, are permitted provided that the following
   9  * conditions are met:
  10  *
  11  * - Redistributions of source code must retain the above copyright
  12  *   notice, this list of conditions and the following disclaimer.
  13  *
  14  * - Redistributions in binary form must reproduce the above
  15  *   copyright notice, this list of conditions and the following
  16  *   disclaimer in the documentation and/or other materials provided
  17  *   with the distribution.
  18  *
  19  * - Neither the name of the Git Development Community nor the
  20  *   names of its contributors may be used to endorse or promote
  21  *   products derived from this software without specific prior
  22  *   written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  25  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  26  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  29  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  32  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  33  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  34  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  36  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 package org.spearce.jgit.lib;
  40
  41 import java.io.File;
  42 import java.io.IOException;
  43
  44 import junit.textui.TestRunner;
  45
  46 public class T0006_DeepSpeedTest extends SpeedTestBase {
  47
  48         protected void setUp() throws Exception {
  49                 prepare(new String[] { "git", "rev-list", "365bbe0d0caaf2ba74d56556827babf0bc66965d","--","net/netfilter/nf_queue.c" });
  50         }
  51
  52         public void testDeepHistoryScan() throws IOException {
  53                 long start = System.currentTimeMillis();
  54                 Repository db = new Repository(new File(kernelrepo));
  55                 Commit commit = db.mapCommit("365bbe0d0caaf2ba74d56556827babf0bc66965d");
  56                 int n = 1;
  57                 for (;;) {
  58                         ObjectId[] parents = commit.getParentIds();
  59                         if (parents.length == 0)
  60                                 break;
  61                         ObjectId parentId = parents[0];
  62                         commit = db.mapCommit(parentId);
  63                         TreeEntry m = commit.getTree().findBlobMember("net/netfilter/nf_queue.c");
  64                         if (m != null)
  65                                 commit.getCommitId().toString();
  66                         ++n;
  67                 }
  68
  69                 assertEquals(12275, n);
  70                 long stop = System.currentTimeMillis();
  71                 long time = stop - start;
  72                 System.out.println("native="+nativeTime);
  73                 System.out.println("jgit="+time);
  74                 /*
  75                 native=1355
  76                 jgit=5449
  77                  */
  78                 // This is not an exact factor, but we'd expect native git to perform this
  79                 // about 4 times quicker. If for some reason we find jgit to be faster than
  80                 // this the cause should be found and secured.
  81                 long factor = (time*110/nativeTime+50)/100;
  82                 assertEquals(4, factor);
  83         }
  84
  85         public static void main(String[] args) {
  86                 TestRunner.run(T0006_DeepSpeedTest.class);
  87         }
  88 }