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| <html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>profiler</title><link rel="stylesheet" type="text/css" href="docbook.css"><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><link rel="home" href="cygwin-ug-net.html" title="Cygwin User's Guide"><link rel="up" href="using-utils.html" title="Cygwin Utilities"><link rel="prev" href="pldd.html" title="pldd"><link rel="next" href="ps.html" title="ps"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">profiler</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="pldd.html">Prev</a> </td><th width="60%" align="center">Cygwin Utilities</th><td width="20%" align="right"> <a accesskey="n" href="ps.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="profiler"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>profiler — Sampling profiler of Cygwin programs with their DLLs</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="command">profiler</code> [-defw] [-o <em class="replaceable"><code>FILENAME</code></em>] [-s <em class="replaceable"><code>N</code></em>] |
| <em class="replaceable"><code>PROGRAM</code></em> |
| <em class="replaceable"><code>ARG</code></em>... |
| | -p <em class="replaceable"><code>PID</code></em> </p></div><div class="cmdsynopsis"><p><code class="command">profiler</code> -h | -V </p></div></div><div class="refsect1"><a name="profiler-options"></a><h2>Options</h2><pre class="screen"> |
| -d, --debug Display debugging messages (toggle: default false) |
| -e, --events Display Windows DEBUG_EVENTS (toggle: default false) |
| -f, --fork-profile Profiles child processes (toggle: default false) |
| -h, --help Display usage information and exit |
| -o, --output=FILENAME Write output to file FILENAME rather than stdout |
| -p, --pid=N Attach to running program with Cygwin pid N |
| ... or with Windows pid -N |
| -s, --sample-rate=N Set IP sampling rate to N Hz (default 100) |
| -v, --verbose Display more status messages (toggle: default false) |
| -V, --version Display version information and exit |
| -w, --new-window Launch given command in a new window |
| </pre></div><div class="refsect1"><a name="profiler-desc"></a><h2>Description</h2><p>The <span class="command"><strong>profiler</strong></span> utility executes a given program and |
| any children of that program, collecting the location of the CPU |
| instruction pointer (IP) many times per second. (It is optional to |
| collect this info from child processes.) This info gives a profile |
| of the program's execution, showing where the most time is being spent. |
| This profiling technique is called "IP sampling".</p><p>A novel feature of <span class="command"><strong>profiler</strong></span> is that time spent in |
| DLLs loaded with or by your program is profiled too. You use |
| <span class="command"><strong>gprof</strong></span> to process and display the resulting profile |
| information. In this fashion you can determine whether your own code, |
| the Cygwin DLL, or another DLL has "hot spots" that might benefit from |
| tuning.</p><p>(See also <span class="command"><strong>ssp</strong></span>, another profiler that |
| operates in a different fashion: stepping by instruction. This can |
| provide a different view on your program's operation.)</p><p>Here is an example of <span class="command"><strong>profiler</strong></span> operation:</p><pre class="screen"> |
| $ profiler du -khs . |
| 22G . |
| 97 samples across 83 buckets written to gmon.out.5908.cygwin1.dll |
| 4 samples across 4 buckets written to gmon.out.5908.KernelBase.dll |
| 1 sample across 1 bucket written to gmon.out.5908.kernel32.dll |
| 7318 samples across 42 buckets written to gmon.out.5908.ntdll.dll |
| 5 samples across 4 buckets written to gmon.out.5908.du.exe |
| </pre></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="pldd.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="using-utils.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ps.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">pldd </td><td width="20%" align="center"><a accesskey="h" href="cygwin-ug-net.html">Home</a></td><td width="40%" align="right" valign="top"> ps</td></tr></table></div></body></html> |
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