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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 <HTML> 1 <HTML>
2 2
3 <HEAD> 3 <HEAD>
4 <title>pprof and Remote Servers</title> 4 <title>pprof and Remote Servers</title>
5 </HEAD> 5 </HEAD>
6 6
7 <BODY> 7 <BODY>
8 8
9 <h1><code>pprof</code> and Remote Servers</h1> 9 <h1><code>pprof</code> and Remote Servers</h1>
10 10
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57 get heap information. The actual url is controlled via the variable 57 get heap information. The actual url is controlled via the variable
58 <code>HEAP_PAGE</code> in the <code>pprof</code> script, so you 58 <code>HEAP_PAGE</code> in the <code>pprof</code> script, so you
59 can change it if you'd like.</p> 59 can change it if you'd like.</p>
60 60
61 <p>There are two ways to get this data. The first is to call</p> 61 <p>There are two ways to get this data. The first is to call</p>
62 <pre> 62 <pre>
63 MallocExtension::instance()->GetHeapSample(&output); 63 MallocExtension::instance()->GetHeapSample(&output);
64 </pre> 64 </pre>
65 <p>and have the server send <code>output</code> back as an HTTP 65 <p>and have the server send <code>output</code> back as an HTTP
66 response to <code>pprof</code>. <code>MallocExtension</code> is 66 response to <code>pprof</code>. <code>MallocExtension</code> is
67 defined in the header file <code>google/malloc_extension.h</code>.</p> 67 defined in the header file <code>gperftools/malloc_extension.h</code>.</p>
68 68
69 <p>Note this will only only work if the binary is being run with 69 <p>Note this will only only work if the binary is being run with
70 sampling turned on (which is not the default). To do this, set the 70 sampling turned on (which is not the default). To do this, set the
71 environment variable <code>TCMALLOC_SAMPLE_PARAMETER</code> to a 71 environment variable <code>TCMALLOC_SAMPLE_PARAMETER</code> to a
72 positive value, such as 524288, before running.</p> 72 positive value, such as 524288, before running.</p>
73 73
74 <p>The other way is to call <code>HeapProfileStart(filename)</code> 74 <p>The other way is to call <code>HeapProfileStart(filename)</code>
75 (from <code>heap-profiler.h</code>), continue to do work, and then, 75 (from <code>heap-profiler.h</code>), continue to do work, and then,
76 some number of seconds later, call <code>GetHeapProfile()</code> 76 some number of seconds later, call <code>GetHeapProfile()</code>
77 (followed by <code>HeapProfilerStop()</code>). The server can send 77 (followed by <code>HeapProfilerStop()</code>). The server can send
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108 get heap-profiling delta (growth) information. The actual url is 108 get heap-profiling delta (growth) information. The actual url is
109 controlled via the variable <code>GROWTH_PAGE</code> in the 109 controlled via the variable <code>GROWTH_PAGE</code> in the
110 <code>pprof</code> script, so you can change it if you'd like.</p> 110 <code>pprof</code> script, so you can change it if you'd like.</p>
111 111
112 <p>The server should respond by calling</p> 112 <p>The server should respond by calling</p>
113 <pre> 113 <pre>
114 MallocExtension::instance()->GetHeapGrowthStacks(&output); 114 MallocExtension::instance()->GetHeapGrowthStacks(&output);
115 </pre> 115 </pre>
116 <p>and sending <code>output</code> back as an HTTP response to 116 <p>and sending <code>output</code> back as an HTTP response to
117 <code>pprof</code>. <code>MallocExtension</code> is defined in the 117 <code>pprof</code>. <code>MallocExtension</code> is defined in the
118 header file <code>google/malloc_extension.h</code>.</p> 118 header file <code>gperftools/malloc_extension.h</code>.</p>
119 119
120 <p>Here's an example, from an actual Google webserver, of what the 120 <p>Here's an example, from an actual Google webserver, of what the
121 output should look like:</p> 121 output should look like:</p>
122 <pre> 122 <pre>
123 heap profile: 741: 812122112 [ 741: 812122112] @ growth 123 heap profile: 741: 812122112 [ 741: 812122112] @ growth
124 1: 1572864 [ 1: 1572864] @ 0x87da564 0x87db8a3 0x84787a4 0x846e851 0x 836d12f 0x834cd1c 0x8349ba5 0x10a3177 0x8349961 124 1: 1572864 [ 1: 1572864] @ 0x87da564 0x87db8a3 0x84787a4 0x846e851 0x 836d12f 0x834cd1c 0x8349ba5 0x10a3177 0x8349961
125 1: 1048576 [ 1: 1048576] @ 0x87d92e8 0x87d9213 0x87d9178 0x87d94d3 0x 87da9da 0x8a364ff 0x8a437e7 0x8ab7d23 0x8ab7da9 0x8ac7454 0x8348465 0x10a3161 0x 8349961 125 1: 1048576 [ 1: 1048576] @ 0x87d92e8 0x87d9213 0x87d9178 0x87d94d3 0x 87da9da 0x8a364ff 0x8a437e7 0x8ab7d23 0x8ab7da9 0x8ac7454 0x8348465 0x10a3161 0x 8349961
126 [...] 126 [...]
127 </pre> 127 </pre>
128 128
129 129
130 <h2> <A NAME="profile"><code><b>/pprof/profile</b></code></A> </h2> 130 <h2> <A NAME="profile"><code><b>/pprof/profile</b></code></A> </h2>
131 131
132 <p><code>pprof</code> asks for the url 132 <p><code>pprof</code> asks for the url
133 <code>/pprof/profile?seconds=XX</code> to get cpu-profiling 133 <code>/pprof/profile?seconds=XX</code> to get cpu-profiling
134 information. The actual url is controlled via the variable 134 information. The actual url is controlled via the variable
135 <code>PROFILE_PAGE</code> in the <code>pprof</code> script, so you can 135 <code>PROFILE_PAGE</code> in the <code>pprof</code> script, so you can
136 change it if you'd like.</p> 136 change it if you'd like.</p>
137 137
138 <p>The server should respond by calling 138 <p>The server should respond by calling
139 <code>ProfilerStart(filename)</code>, continuing to do its work, and 139 <code>ProfilerStart(filename)</code>, continuing to do its work, and
140 then, XX seconds later, calling <code>ProfilerStop()</code>. (These 140 then, XX seconds later, calling <code>ProfilerStop()</code>. (These
141 functions are declared in <code>google/profiler.h</code>.) The 141 functions are declared in <code>gperftools/profiler.h</code>.) The
142 application is responsible for picking a unique filename for 142 application is responsible for picking a unique filename for
143 <code>ProfilerStart()</code>. After calling 143 <code>ProfilerStart()</code>. After calling
144 <code>ProfilerStop()</code>, the server should read the contents of 144 <code>ProfilerStop()</code>, the server should read the contents of
145 <code>filename</code> and send them back as an HTTP response to 145 <code>filename</code> and send them back as an HTTP response to
146 <code>pprof</code>.</p> 146 <code>pprof</code>.</p>
147 147
148 <p>Obviously, to get useful profile information the application must 148 <p>Obviously, to get useful profile information the application must
149 continue to run in the XX seconds that the profiler is running. Thus, 149 continue to run in the XX seconds that the profiler is running. Thus,
150 the profile start-stop calls should be done in a separate thread, or 150 the profile start-stop calls should be done in a separate thread, or
151 be otherwise non-blocking.</p> 151 be otherwise non-blocking.</p>
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251 251
252 <p><code>pprof</code> itself does just this for local profiles (not 252 <p><code>pprof</code> itself does just this for local profiles (not
253 ones that talk to remote servers); look at the subroutine 253 ones that talk to remote servers); look at the subroutine
254 <code>GetProcedureBoundaries</code>.</p> 254 <code>GetProcedureBoundaries</code>.</p>
255 255
256 256
257 <hr> 257 <hr>
258 Last modified: Mon Jun 12 21:30:14 PDT 2006 258 Last modified: Mon Jun 12 21:30:14 PDT 2006
259 </body> 259 </body>
260 </html> 260 </html>
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