搜索

此内容没有您所选择的语言版本。

40.5. Analyzing the Data

download PDF
Periodically, the OProfile daemon, oprofiled, collects the samples and writes them to the /var/lib/oprofile/samples/ directory. Before reading the data, make sure all data has been written to this directory by executing the following command as root:
opcontrol --dump
Each sample file name is based on the name of the executable. For example, the samples for the default event on a Pentium III processor for /bin/bash becomes:
\{root\}/bin/bash/\{dep\}/\{root\}/bin/bash/CPU_CLK_UNHALTED.100000
The following tools are available to profile the sample data once it has been collected:
  • opreport
  • opannotate
Use these tools, along with the binaries profiled, to generate reports that can be further analyzed.

Warning

The executable being profiled must be used with these tools to analyze the data. If it must change after the data is collected, backup the executable used to create the samples as well as the sample files.
Samples for each executable are written to a single sample file. Samples from each dynamically linked library are also written to a single sample file. While OProfile is running, if the executable being monitored changes and a sample file for the executable exists, the existing sample file is automatically deleted. Thus, if the existing sample file is needed, it must be backed up, along with the executable used to create it before replacing the executable with a new version. Refer to Section 40.4, “Saving Data” for details on how to backup the sample file.

40.5.1. Using opreport

The opreport tool provides an overview of all the executables being profiled.
The following is part of an example output:
Profiling through timer interrupt
          TIMER:0|
  samples|      %|
------------------
    25926 97.5212 no-vmlinux
      359  1.3504 pi
       65  0.2445 Xorg
       62  0.2332 libvte.so.4.4.0
       56  0.2106 libc-2.3.4.so
       34  0.1279 libglib-2.0.so.0.400.7
       19  0.0715 libXft.so.2.1.2
       17  0.0639 bash
        8  0.0301 ld-2.3.4.so
        8  0.0301 libgdk-x11-2.0.so.0.400.13
        6  0.0226 libgobject-2.0.so.0.400.7
        5  0.0188 oprofiled
        4  0.0150 libpthread-2.3.4.so
        4  0.0150 libgtk-x11-2.0.so.0.400.13
        3  0.0113 libXrender.so.1.2.2
        3  0.0113 du
        1  0.0038 libcrypto.so.0.9.7a
        1  0.0038 libpam.so.0.77
        1  0.0038 libtermcap.so.2.0.8
        1  0.0038 libX11.so.6.2
        1  0.0038 libgthread-2.0.so.0.400.7
        1  0.0038 libwnck-1.so.4.9.0
Each executable is listed on its own line. The first column is the number of samples recorded for the executable. The second column is the percentage of samples relative to the total number of samples. The third column is the name of the executable.
Refer to the opreport man page for a list of available command line options, such as the -r option used to sort the output from the executable with the smallest number of samples to the one with the largest number of samples.
Red Hat logoGithubRedditYoutubeTwitter

学习

尝试、购买和销售

社区

关于红帽文档

通过我们的产品和服务,以及可以信赖的内容,帮助红帽用户创新并实现他们的目标。

让开源更具包容性

红帽致力于替换我们的代码、文档和 Web 属性中存在问题的语言。欲了解更多详情,请参阅红帽博客.

關於紅帽

我们提供强化的解决方案,使企业能够更轻松地跨平台和环境(从核心数据中心到网络边缘)工作。

© 2024 Red Hat, Inc.