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diff --git a/gcc-4.8.1/libstdc++-v3/doc/html/manual/profile_mode.html b/gcc-4.8.1/libstdc++-v3/doc/html/manual/profile_mode.html deleted file mode 100644 index 55778294f..000000000 --- a/gcc-4.8.1/libstdc++-v3/doc/html/manual/profile_mode.html +++ /dev/null @@ -1,145 +0,0 @@ -<?xml version="1.0" encoding="UTF-8" standalone="no"?> -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 19. Profile Mode</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.77.1" /><meta name="keywords" content="C++, library, profile" /><meta name="keywords" content="ISO C++, library" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.html" title="The GNU C++ Library" /><link rel="up" href="extensions.html" title="Part III. Extensions" /><link rel="prev" href="parallel_mode_test.html" title="Testing" /><link rel="next" href="profile_mode_design.html" title="Design" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 19. Profile Mode</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="parallel_mode_test.html">Prev</a> </td><th width="60%" align="center">Part III. - Extensions - -</th><td width="20%" align="right"> <a accesskey="n" href="profile_mode_design.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a id="manual.ext.profile_mode"></a>Chapter 19. Profile Mode</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl><dt><span class="section"><a href="profile_mode.html#manual.ext.profile_mode.intro">Intro</a></span></dt><dd><dl><dt><span class="section"><a href="profile_mode.html#manual.ext.profile_mode.using">Using the Profile Mode</a></span></dt><dt><span class="section"><a href="profile_mode.html#manual.ext.profile_mode.tuning">Tuning the Profile Mode</a></span></dt></dl></dd><dt><span class="section"><a href="profile_mode_design.html">Design</a></span></dt><dd><dl><dt><span class="section"><a href="profile_mode_design.html#manual.ext.profile_mode.design.wrapper">Wrapper Model</a></span></dt><dt><span class="section"><a href="profile_mode_design.html#manual.ext.profile_mode.design.instrumentation">Instrumentation</a></span></dt><dt><span class="section"><a href="profile_mode_design.html#manual.ext.profile_mode.design.rtlib">Run Time Behavior</a></span></dt><dt><span class="section"><a href="profile_mode_design.html#manual.ext.profile_mode.design.analysis">Analysis and Diagnostics</a></span></dt><dt><span class="section"><a href="profile_mode_design.html#manual.ext.profile_mode.design.cost-model">Cost Model</a></span></dt><dt><span class="section"><a href="profile_mode_design.html#manual.ext.profile_mode.design.reports">Reports</a></span></dt><dt><span class="section"><a href="profile_mode_design.html#manual.ext.profile_mode.design.testing">Testing</a></span></dt></dl></dd><dt><span class="section"><a href="profile_mode_api.html">Extensions for Custom Containers</a></span></dt><dt><span class="section"><a href="profile_mode_cost_model.html">Empirical Cost Model</a></span></dt><dt><span class="section"><a href="profile_mode_impl.html">Implementation Issues</a></span></dt><dd><dl><dt><span class="section"><a href="profile_mode_impl.html#manual.ext.profile_mode.implementation.stack">Stack Traces</a></span></dt><dt><span class="section"><a href="profile_mode_impl.html#manual.ext.profile_mode.implementation.symbols">Symbolization of Instruction Addresses</a></span></dt><dt><span class="section"><a href="profile_mode_impl.html#manual.ext.profile_mode.implementation.concurrency">Concurrency</a></span></dt><dt><span class="section"><a href="profile_mode_impl.html#manual.ext.profile_mode.implementation.stdlib-in-proflib">Using the Standard Library in the Instrumentation Implementation</a></span></dt><dt><span class="section"><a href="profile_mode_impl.html#manual.ext.profile_mode.implementation.malloc-hooks">Malloc Hooks</a></span></dt><dt><span class="section"><a href="profile_mode_impl.html#manual.ext.profile_mode.implementation.construction-destruction">Construction and Destruction of Global Objects</a></span></dt></dl></dd><dt><span class="section"><a href="profile_mode_devel.html">Developer Information</a></span></dt><dd><dl><dt><span class="section"><a href="profile_mode_devel.html#manual.ext.profile_mode.developer.bigpic">Big Picture</a></span></dt><dt><span class="section"><a href="profile_mode_devel.html#manual.ext.profile_mode.developer.howto">How To Add A Diagnostic</a></span></dt></dl></dd><dt><span class="section"><a href="profile_mode_diagnostics.html">Diagnostics</a></span></dt><dd><dl><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.template">Diagnostic Template</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.containers">Containers</a></span></dt><dd><dl><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.hashtable_too_small">Hashtable Too Small</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.hashtable_too_large">Hashtable Too Large</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.inefficient_hash">Inefficient Hash</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.vector_too_small">Vector Too Small</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.vector_too_large">Vector Too Large</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.vector_to_hashtable">Vector to Hashtable</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.hashtable_to_vector">Hashtable to Vector</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.vector_to_list">Vector to List</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.list_to_vector">List to Vector</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.list_to_slist">List to Forward List (Slist)</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.assoc_ord_to_unord">Ordered to Unordered Associative Container</a></span></dt></dl></dd><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.algorithms">Algorithms</a></span></dt><dd><dl><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.algorithms.sort">Sort Algorithm Performance</a></span></dt></dl></dd><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.locality">Data Locality</a></span></dt><dd><dl><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.locality.sw_prefetch">Need Software Prefetch</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.locality.linked">Linked Structure Locality</a></span></dt></dl></dd><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.mthread">Multithreaded Data Access</a></span></dt><dd><dl><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.mthread.ddtest">Data Dependence Violations at Container Level</a></span></dt><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.mthread.false_share">False Sharing</a></span></dt></dl></dd><dt><span class="section"><a href="profile_mode_diagnostics.html#manual.ext.profile_mode.analysis.statistics">Statistics</a></span></dt></dl></dd><dt><span class="bibliography"><a href="profile_mode.html#profile_mode.biblio">Bibliography</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.ext.profile_mode.intro"></a>Intro</h2></div></div></div><p> - <span class="emphasis"><em>Goal: </em></span>Give performance improvement advice based on - recognition of suboptimal usage patterns of the standard library. - </p><p> - <span class="emphasis"><em>Method: </em></span>Wrap the standard library code. Insert - calls to an instrumentation library to record the internal state of - various components at interesting entry/exit points to/from the standard - library. Process trace, recognize suboptimal patterns, give advice. - For details, see - <a class="link" href="http://dx.doi.org/10.1109/CGO.2009.36" target="_top">paper presented at - CGO 2009</a>. - </p><p> - <span class="emphasis"><em>Strengths: </em></span> -</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> - Unintrusive solution. The application code does not require any - modification. - </p></li><li class="listitem"><p> The advice is call context sensitive, thus capable of - identifying precisely interesting dynamic performance behavior. - </p></li><li class="listitem"><p> - The overhead model is pay-per-view. When you turn off a diagnostic class - at compile time, its overhead disappears. - </p></li></ul></div><p> - </p><p> - <span class="emphasis"><em>Drawbacks: </em></span> -</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> - You must recompile the application code with custom options. - </p></li><li class="listitem"><p>You must run the application on representative input. - The advice is input dependent. - </p></li><li class="listitem"><p> - The execution time will increase, in some cases by factors. - </p></li></ul></div><p> - </p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="manual.ext.profile_mode.using"></a>Using the Profile Mode</h3></div></div></div><p> - This is the anticipated common workflow for program <code class="code">foo.cc</code>: -</p><pre class="programlisting"> -$ cat foo.cc -#include <vector> -int main() { - vector<int> v; - for (int k = 0; k < 1024; ++k) v.insert(v.begin(), k); -} - -$ g++ -D_GLIBCXX_PROFILE foo.cc -$ ./a.out -$ cat libstdcxx-profile.txt -vector-to-list: improvement = 5: call stack = 0x804842c ... - : advice = change std::vector to std::list -vector-size: improvement = 3: call stack = 0x804842c ... - : advice = change initial container size from 0 to 1024 -</pre><p> - </p><p> - Anatomy of a warning: - </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> - Warning id. This is a short descriptive string for the class - that this warning belongs to. E.g., "vector-to-list". - </p></li><li class="listitem"><p> - Estimated improvement. This is an approximation of the benefit expected - from implementing the change suggested by the warning. It is given on - a log10 scale. Negative values mean that the alternative would actually - do worse than the current choice. - In the example above, 5 comes from the fact that the overhead of - inserting at the beginning of a vector vs. a list is around 1024 * 1024 / 2, - which is around 10e5. The improvement from setting the initial size to - 1024 is in the range of 10e3, since the overhead of dynamic resizing is - linear in this case. - </p></li><li class="listitem"><p> - Call stack. Currently, the addresses are printed without - symbol name or code location attribution. - Users are expected to postprocess the output using, for instance, addr2line. - </p></li><li class="listitem"><p> - The warning message. For some warnings, this is static text, e.g., - "change vector to list". For other warnings, such as the one above, - the message contains numeric advice, e.g., the suggested initial size - of the vector. - </p></li></ul></div><p> - </p><p>Three files are generated. <code class="code">libstdcxx-profile.txt</code> - contains human readable advice. <code class="code">libstdcxx-profile.raw</code> - contains implementation specific data about each diagnostic. - Their format is not documented. They are sufficient to generate - all the advice given in <code class="code">libstdcxx-profile.txt</code>. The advantage - of keeping this raw format is that traces from multiple executions can - be aggregated simply by concatenating the raw traces. We intend to - offer an external utility program that can issue advice from a trace. - <code class="code">libstdcxx-profile.conf.out</code> lists the actual diagnostic - parameters used. To alter parameters, edit this file and rename it to - <code class="code">libstdcxx-profile.conf</code>. - </p><p>Advice is given regardless whether the transformation is valid. - For instance, we advise changing a map to an unordered_map even if the - application semantics require that data be ordered. - We believe such warnings can help users understand the performance - behavior of their application better, which can lead to changes - at a higher abstraction level. - </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="manual.ext.profile_mode.tuning"></a>Tuning the Profile Mode</h3></div></div></div><p>Compile time switches and environment variables (see also file - profiler.h). Unless specified otherwise, they can be set at compile time - using -D_<name> or by setting variable <name> - in the environment where the program is run, before starting execution. - </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> - <code class="code">_GLIBCXX_PROFILE_NO_<diagnostic></code>: - disable specific diagnostics. - See section Diagnostics for possible values. - (Environment variables not supported.) - </p></li><li class="listitem"><p> - <code class="code">_GLIBCXX_PROFILE_TRACE_PATH_ROOT</code>: set an alternative root - path for the output files. - </p></li><li class="listitem"><p>_GLIBCXX_PROFILE_MAX_WARN_COUNT: set it to the maximum - number of warnings desired. The default value is 10.</p></li><li class="listitem"><p> - <code class="code">_GLIBCXX_PROFILE_MAX_STACK_DEPTH</code>: if set to 0, - the advice will - be collected and reported for the program as a whole, and not for each - call context. - This could also be used in continuous regression tests, where you - just need to know whether there is a regression or not. - The default value is 32. - </p></li><li class="listitem"><p> - <code class="code">_GLIBCXX_PROFILE_MEM_PER_DIAGNOSTIC</code>: - set a limit on how much memory to use for the accounting tables for each - diagnostic type. When this limit is reached, new events are ignored - until the memory usage decreases under the limit. Generally, this means - that newly created containers will not be instrumented until some - live containers are deleted. The default is 128 MB. - </p></li><li class="listitem"><p> - <code class="code">_GLIBCXX_PROFILE_NO_THREADS</code>: - Make the library not use threads. If thread local storage (TLS) is not - available, you will get a preprocessor error asking you to set - -D_GLIBCXX_PROFILE_NO_THREADS if your program is single-threaded. - Multithreaded execution without TLS is not supported. - (Environment variable not supported.) - </p></li><li class="listitem"><p> - <code class="code">_GLIBCXX_HAVE_EXECINFO_H</code>: - This name should be defined automatically at library configuration time. - If your library was configured without <code class="code">execinfo.h</code>, but - you have it in your include path, you can define it explicitly. Without - it, advice is collected for the program as a whole, and not for each - call context. - (Environment variable not supported.) - </p></li></ul></div><p> - </p></div></div><div class="bibliography"><div class="titlepage"><div><div><h2 class="title"><a id="profile_mode.biblio"></a>Bibliography</h2></div></div></div><div class="biblioentry"><a id="idp17395456"></a><p><span class="citetitle"><em class="citetitle"> - Perflint: A Context Sensitive Performance Advisor for C++ Programs - </em>. </span><span class="author"><span class="firstname">Lixia</span> <span class="surname">Liu</span>. </span><span class="author"><span class="firstname">Silvius</span> <span class="surname">Rus</span>. </span><span class="copyright">Copyright © 2009 . </span><span class="publisher"><span class="publishername"> - Proceedings of the 2009 International Symposium on Code Generation - and Optimization - . </span></span></p></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="parallel_mode_test.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="extensions.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="profile_mode_design.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Testing </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Design</td></tr></table></div></body></html>
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