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1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 1<?xml version="1.0" encoding="UTF-8" standalone="no"?>
2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title xmlns:d="http://docbook.org/ns/docbook">5.3.6. Tracking System Call Volume Per Process</title><link rel="stylesheet" type="text/css" href="Common_Content/css/default.css" /><link rel="stylesheet" media="print" href="Common_Content/css/print.css" type="text/css" /><meta xmlns:d="http://docbook.org/ns/docbook" name="generator" content="publican v4.0.0" /><meta xmlns:d="http://docbook.org/ns/docbook" name="package" content="SystemTap-SystemTap_Beginners_Guide-2.6-en-US-2.0-1" /><link rel="home" href="index.html" title="SystemTap Beginners Guide" /><link rel="up" href="mainsect-profiling.html" title="5.3. Profiling" /><link rel="prev" href="topsyssect.html" title="5.3.5. Tracking Most Frequently Used System Calls" /><link rel="next" href="futexcontentionsect.html" title="5.4. Identifying Contended User-Space Locks" /></head><body><p id="title"><a class="left" href="https://fedorahosted.org/publican"><img alt="Product Site" src="Common_Content/images//image_left.png" /></a><a class="right" href="https://fedorahosted.org/publican"><img alt="Documentation Site" src="Common_Content/images//image_right.png" /></a></p><ul class="docnav top"><li class="previous"><a accesskey="p" href="topsyssect.html"><strong>Prev</strong></a></li><li class="home">SystemTap Beginners Guide</li><li class="next"><a accesskey="n" href="futexcontentionsect.html"><strong>Next</strong></a></li></ul><div xml:lang="en-US" class="section" lang="en-US"><div class="titlepage"><div><div><h3 class="title"><a id="syscallsbyprocpidsect"></a>5.3.6. Tracking System Call Volume Per Process</h3></div></div></div><a id="idm246913101264" class="indexterm"></a><a id="idm246920806208" class="indexterm"></a><a id="idm246917447568" class="indexterm"></a><a id="idm246913519088" class="indexterm"></a><div class="para">
3<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>5.3.6. Tracking System Call Volume Per Process</title><link rel="stylesheet" type="text/css" href="Common_Content/css/default.css" /><link rel="stylesheet" media="print" href="Common_Content/css/print.css" type="text/css" /><meta name="generator" content="publican 2.8" /><meta name="package" content="Systemtap-SystemTap_Beginners_Guide-2.2-en-US-2.2-2" /><link rel="home" href="index.html" title="SystemTap Beginners Guide" /><link rel="up" href="mainsect-profiling.html" title="5.3. Profiling" /><link rel="prev" href="topsyssect.html" title="5.3.5. Tracking Most Frequently Used System Calls" /><link rel="next" href="futexcontentionsect.html" title="5.4. Identifying Contended User-Space Locks" /></head><body><p id="title"><a class="left" href="https://fedorahosted.org/publican"><img src="Common_Content/images/image_left.png" alt="Product Site" /></a><a class="right" href="https://fedorahosted.org/publican"><img src="Common_Content/images/image_right.png" alt="Documentation Site" /></a></p><ul class="docnav"><li class="previous"><a accesskey="p" href="topsyssect.html"><strong>Prev</strong></a></li><li class="next"><a accesskey="n" href="futexcontentionsect.html"><strong>Next</strong></a></li></ul><div xml:lang="en-US" class="section" id="syscallsbyprocpidsect" lang="en-US"><div class="titlepage"><div><div><h3 class="title" id="syscallsbyprocpidsect">5.3.6. Tracking System Call Volume Per Process</h3></div></div></div><a id="idp45906528" class="indexterm"></a><a id="idm1934848" class="indexterm"></a><a id="idp40104512" class="indexterm"></a><a id="idp29954720" class="indexterm"></a><div class="para">
4 This section illustrates how to determine which processes are performing the highest volume of system calls. In previous sections, we've described how to monitor the top system calls used by the system over time (<a class="xref" href="topsyssect.html">Section 5.3.5, “Tracking Most Frequently Used System Calls”</a>). We've also described how to identify which applications use a specific set of "polling suspect" system calls the most (<a class="xref" href="timeoutssect.html">Section 5.3.4, “Monitoring Polling Applications”</a>). Monitoring the volume of system calls made by each process provides more data in investigating your system for polling processes and other resource hogs. 3 This section illustrates how to determine which processes are performing the highest volume of system calls. In previous sections, we've described how to monitor the top system calls used by the system over time (<a class="xref" href="topsyssect.html">Section 5.3.5, “Tracking Most Frequently Used System Calls”</a>). We've also described how to identify which applications use a specific set of "polling suspect" system calls the most (<a class="xref" href="timeoutssect.html">Section 5.3.4, “Monitoring Polling Applications”</a>). Monitoring the volume of system calls made by each process provides more data in investigating your system for polling processes and other resource hogs.
5 </div><div class="formalpara" id="syscallsbyprocpid"><h5 class="formalpara">syscalls_by_proc.stp</h5> 4 </div><div class="formalpara"><div xmlns:d="http://docbook.org/ns/docbook" class="title">syscalls_by_proc.stp</div>
6 5
7<pre class="programlisting">#! /usr/bin/env stap 6<pre class="programlisting">#! /usr/bin/env stap
8 7
@@ -35,7 +34,7 @@ probe end {
35</pre> 34</pre>
36 </div><div class="para"> 35 </div><div class="para">
37 <a class="xref" href="syscallsbyprocpidsect.html#syscallsbyprocpid">syscalls_by_proc.stp</a> lists the top 20 processes performing the highest number of system calls. It also lists how many system calls each process performed during the time period. Refer to <a class="xref" href="syscallsbyprocpidsect.html#syscallsbyprocpidoutput">Example 5.18, “topsys.stp Sample Output”</a> for a sample output. 36 <a class="xref" href="syscallsbyprocpidsect.html#syscallsbyprocpid">syscalls_by_proc.stp</a> lists the top 20 processes performing the highest number of system calls. It also lists how many system calls each process performed during the time period. Refer to <a class="xref" href="syscallsbyprocpidsect.html#syscallsbyprocpidoutput">Example 5.18, “topsys.stp Sample Output”</a> for a sample output.
38 </div><div class="example" id="syscallsbyprocpidoutput"><h6>Example 5.18. <a class="xref" href="topsyssect.html#topsys">topsys.stp</a> Sample Output</h6><div class="example-contents"><pre class="screen">Collecting data... Type Ctrl-C to exit and display results 37 </div><div class="example"><a id="syscallsbyprocpidoutput"></a><p class="title"><strong>Example 5.18. <a class="xref" href="topsyssect.html#topsys">topsys.stp</a> Sample Output</strong></p><div class="example-contents"><pre class="screen">Collecting data... Type Ctrl-C to exit and display results
39#SysCalls Process Name 38#SysCalls Process Name
401577 multiload-apple 391577 multiload-apple
41692 synergyc 40692 synergyc
@@ -51,8 +50,8 @@ probe end {
5178 gnome-screensav 5078 gnome-screensav
5266 scim-launcher 5166 scim-launcher
53[...]</pre></div></div><br class="example-break" /><div class="para"> 52[...]</pre></div></div><br class="example-break" /><div class="para">
54 If you prefer the output to display the process IDs instead of the process names, use the following script instead. 53 To display the process IDs instead of the process names, use the following script instead.
55 </div><div class="formalpara" id="syscallsbypid"><h5 class="formalpara">syscalls_by_pid.stp</h5> 54 </div><div class="formalpara"><div xmlns:d="http://docbook.org/ns/docbook" class="title">syscalls_by_pid.stp</div>
56 55
57<pre class="programlisting">#! /usr/bin/env stap 56<pre class="programlisting">#! /usr/bin/env stap
58 57
@@ -88,4 +87,4 @@ probe end {
88 </div><pre class="screen">probe timer.s(5) 87 </div><pre class="screen">probe timer.s(5)
89{ 88{
90 exit() 89 exit()
91}</pre></div><ul class="docnav"><li class="previous"><a accesskey="p" href="topsyssect.html"><strong>Prev</strong>5.3.5. Tracking Most Frequently Used System Calls</a></li><li class="up"><a accesskey="u" href="#"><strong>Up</strong></a></li><li class="home"><a accesskey="h" href="index.html"><strong>Home</strong></a></li><li class="next"><a accesskey="n" href="futexcontentionsect.html"><strong>Next</strong>5.4. Identifying Contended User-Space Locks</a></li></ul></body></html> 90}</pre></div><ul class="docnav"><li class="previous"><a accesskey="p" href="topsyssect.html"><strong>Prev</strong>5.3.5. Tracking Most Frequently Used System Calls</a></li><li class="up"><a accesskey="u" href="#"><strong>Up</strong></a></li><li class="home"><a accesskey="h" href="index.html"><strong>Home</strong></a></li><li class="next"><a accesskey="n" href="futexcontentionsect.html"><strong>Next</strong>5.4. Identifying Contended User-Space Locks</a></li></ul></body></html> \ No newline at end of file
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