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Issue 9316021: Update the tcmalloc vendor branch to r144 (gperftools 2.0). (Closed) Base URL: http://git.chromium.org/git/chromium.git@trunk
Patch Set: Reuploading 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>Google CPU Profiler</title> 6 <title>Gperftools 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, to profile 53 to dump the profile to. For instance, if you had a version of
54 <code>/usr/local/bin/my_binary_compiled_with_libprofiler_so</code>:</p> 54 <code>/bin/ls</code> that had been linked against libprofiler,
55 <pre>% env CPUPROFILE=/tmp/mybin.prof /usr/local/bin/my_binary_compiled_w ith_libprofiler_so</pre> 55 you could run:</p>
56 <pre>% env CPUPROFILE=ls.prof /bin/ls</pre>
56 57
57 <li> <p>In your code, bracket the code you want profiled in calls to 58 <li> <p>In your code, bracket the code you want profiled in calls to
58 <code>ProfilerStart()</code> and <code>ProfilerStop()</code>. 59 <code>ProfilerStart()</code> and <code>ProfilerStop()</code>.
59 (These functions are declared in <code>&lt;google/profiler.h&gt;</code>.) 60 (These functions are declared in <code>&lt;gperftools/profiler.h&gt;</cod e>.)
60 <code>ProfilerStart()</code> will take 61 <code>ProfilerStart()</code> will take
61 the profile-filename as an argument.</p> 62 the profile-filename as an argument.</p>
62 </ol> 63 </ol>
63 64
64 <p>In Linux 2.6 and above, profiling works correctly with threads, 65 <p>In Linux 2.6 and above, profiling works correctly with threads,
65 automatically profiling all threads. In Linux 2.4, profiling only 66 automatically profiling all threads. In Linux 2.4, profiling only
66 profiles the main thread (due to a kernel bug involving itimers and 67 profiles the main thread (due to a kernel bug involving itimers and
67 threads). Profiling works correctly with sub-processes: each child 68 threads). Profiling works correctly with sub-processes: each child
68 process gets its own profile with its own name (generated by combining 69 process gets its own profile with its own name (generated by combining
69 CPUPROFILE with the child's process id).</p> 70 CPUPROFILE with the child's process id).</p>
70 71
71 <p>For security reasons, CPU profiling will not write to a file -- and 72 <p>For security reasons, CPU profiling will not write to a file -- and
72 is thus not usable -- for setuid programs.</p> 73 is thus not usable -- for setuid programs.</p>
73 74
74 <p>See the include-file <code>google/profiler.h</code> for 75 <p>See the include-file <code>gperftools/profiler.h</code> for
75 advanced-use functions, including <code>ProfilerFlush()</code> and 76 advanced-use functions, including <code>ProfilerFlush()</code> and
76 <code>ProfilerStartWithOptions()</code>.</p> 77 <code>ProfilerStartWithOptions()</code>.</p>
77 78
78 79
79 <H2>Modifying Runtime Behavior</H2> 80 <H2>Modifying Runtime Behavior</H2>
80 81
81 <p>You can more finely control the behavior of the CPU profiler via 82 <p>You can more finely control the behavior of the CPU profiler via
82 environment variables.</p> 83 environment variables.</p>
83 84
84 <table frame=box rules=sides cellpadding=5 width=100%> 85 <table frame=box rules=sides cellpadding=5 width=100%>
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511 512
512 <hr> 513 <hr>
513 <address>Sanjay Ghemawat<br> 514 <address>Sanjay Ghemawat<br>
514 <!-- Created: Tue Dec 19 10:43:14 PST 2000 --> 515 <!-- Created: Tue Dec 19 10:43:14 PST 2000 -->
515 <!-- hhmts start --> 516 <!-- hhmts start -->
516 Last modified: Fri May 9 14:41:29 PDT 2008 517 Last modified: Fri May 9 14:41:29 PDT 2008
517 <!-- hhmts end --> 518 <!-- hhmts end -->
518 </address> 519 </address>
519 </BODY> 520 </BODY>
520 </HTML> 521 </HTML>
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