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Issue 9701040: Revert 126715 - Update the tcmalloc vendor branch to r144 (gperftools 2.0). (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: Created 8 years, 9 months ago
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1 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"> 1 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
2 <HTML> 2 <HTML>
3 3
4 <HEAD> 4 <HEAD>
5 <link rel="stylesheet" href="designstyle.css"> 5 <link rel="stylesheet" href="designstyle.css">
6 <title>Gperftools CPU Profiler</title> 6 <title>Google CPU Profiler</title>
7 </HEAD> 7 </HEAD>
8 8
9 <BODY> 9 <BODY>
10 10
11 <p align=right> 11 <p align=right>
12 <i>Last modified 12 <i>Last modified
13 <script type=text/javascript> 13 <script type=text/javascript>
14 var lm = new Date(document.lastModified); 14 var lm = new Date(document.lastModified);
15 document.write(lm.toDateString()); 15 document.write(lm.toDateString());
16 </script></i> 16 </script></i>
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43 system.)</p> 43 system.)</p>
44 44
45 45
46 <H1>Running the Code</H1> 46 <H1>Running the Code</H1>
47 47
48 <p>There are several alternatives to actually turn on CPU profiling 48 <p>There are several alternatives to actually turn on CPU profiling
49 for a given run of an executable:</p> 49 for a given run of an executable:</p>
50 50
51 <ol> 51 <ol>
52 <li> <p>Define the environment variable CPUPROFILE to the filename 52 <li> <p>Define the environment variable CPUPROFILE to the filename
53 to dump the profile to. For instance, if you had a version of 53 to dump the profile to. For instance, to profile
54 <code>/bin/ls</code> that had been linked against libprofiler, 54 <code>/usr/local/bin/my_binary_compiled_with_libprofiler_so</code>:</p>
55 you could run:</p> 55 <pre>% env CPUPROFILE=/tmp/mybin.prof /usr/local/bin/my_binary_compiled_w ith_libprofiler_so</pre>
56 <pre>% env CPUPROFILE=ls.prof /bin/ls</pre>
57 56
58 <li> <p>In your code, bracket the code you want profiled in calls to 57 <li> <p>In your code, bracket the code you want profiled in calls to
59 <code>ProfilerStart()</code> and <code>ProfilerStop()</code>. 58 <code>ProfilerStart()</code> and <code>ProfilerStop()</code>.
60 (These functions are declared in <code>&lt;gperftools/profiler.h&gt;</cod e>.) 59 (These functions are declared in <code>&lt;google/profiler.h&gt;</code>.)
61 <code>ProfilerStart()</code> will take 60 <code>ProfilerStart()</code> will take
62 the profile-filename as an argument.</p> 61 the profile-filename as an argument.</p>
63 </ol> 62 </ol>
64 63
65 <p>In Linux 2.6 and above, profiling works correctly with threads, 64 <p>In Linux 2.6 and above, profiling works correctly with threads,
66 automatically profiling all threads. In Linux 2.4, profiling only 65 automatically profiling all threads. In Linux 2.4, profiling only
67 profiles the main thread (due to a kernel bug involving itimers and 66 profiles the main thread (due to a kernel bug involving itimers and
68 threads). Profiling works correctly with sub-processes: each child 67 threads). Profiling works correctly with sub-processes: each child
69 process gets its own profile with its own name (generated by combining 68 process gets its own profile with its own name (generated by combining
70 CPUPROFILE with the child's process id).</p> 69 CPUPROFILE with the child's process id).</p>
71 70
72 <p>For security reasons, CPU profiling will not write to a file -- and 71 <p>For security reasons, CPU profiling will not write to a file -- and
73 is thus not usable -- for setuid programs.</p> 72 is thus not usable -- for setuid programs.</p>
74 73
75 <p>See the include-file <code>gperftools/profiler.h</code> for 74 <p>See the include-file <code>google/profiler.h</code> for
76 advanced-use functions, including <code>ProfilerFlush()</code> and 75 advanced-use functions, including <code>ProfilerFlush()</code> and
77 <code>ProfilerStartWithOptions()</code>.</p> 76 <code>ProfilerStartWithOptions()</code>.</p>
78 77
79 78
80 <H2>Modifying Runtime Behavior</H2> 79 <H2>Modifying Runtime Behavior</H2>
81 80
82 <p>You can more finely control the behavior of the CPU profiler via 81 <p>You can more finely control the behavior of the CPU profiler via
83 environment variables.</p> 82 environment variables.</p>
84 83
85 <table frame=box rules=sides cellpadding=5 width=100%> 84 <table frame=box rules=sides cellpadding=5 width=100%>
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512 511
513 <hr> 512 <hr>
514 <address>Sanjay Ghemawat<br> 513 <address>Sanjay Ghemawat<br>
515 <!-- Created: Tue Dec 19 10:43:14 PST 2000 --> 514 <!-- Created: Tue Dec 19 10:43:14 PST 2000 -->
516 <!-- hhmts start --> 515 <!-- hhmts start -->
517 Last modified: Fri May 9 14:41:29 PDT 2008 516 Last modified: Fri May 9 14:41:29 PDT 2008
518 <!-- hhmts end --> 517 <!-- hhmts end -->
519 </address> 518 </address>
520 </BODY> 519 </BODY>
521 </HTML> 520 </HTML>
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