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~]${nbsp}pass:attributes[{blank}][command]#opreport#
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
A directory exists in `/dev/oprofile/` for each counter. For example, if there are 2 counters, the directories `/dev/oprofile/0/` and `/dev/oprofile/1/` exist.
After changing any of the options, save them by clicking the btn:[Save and quit] button. The preferences are written to `/root/.oprofile/daemonrc`, and the application exits. Exiting the application does not stop OProfile from sampling.
After successful setup, you can apply the standard profiling and analyzing tools described in previous sections
-agentlib:pass:quotes[_jvmti_oprofile_]
-agentlib:/usr/lib64/oprofile/libjvmti_oprofile.so
Analyzing the Data
Back up the executable and the sample files
Be extremely careful when setting sampling rates. Sampling too frequently can overload the system, causing the system to appear frozen or causing the system to actually freeze.
[[br-oprofile_online_documentation]]
.Online Documentation
By default, [command]#operf# stores the profiling data in the `pass:attributes[{blank}]_current_dir_pass:attributes[{blank}]/oprofile_data/` directory. You can change to a different location with the [option]`--session-dir` option. The usual post-profiling analysis tools such as [command]#opreport# and [command]#opannotate# can be used to generate profile reports. These tools search for samples in `pass:attributes[{blank}]_current_dir_pass:attributes[{blank}]/oprofile_data/` first. If this directory does not exist, the analysis tools use the standard session directory of `/var/lib/oprofile/`. Statistics, such as total samples received and lost samples, are written to the `pass:attributes[{blank}]_session_dir_pass:attributes[{blank}]/samples/operf.log` file.
~]# cat /dev/oprofile/0/count
~]# cat /dev/oprofile/cpu_type
Categorization of Samples
[command]#all# — Generate per-application profiles for libraries and per-application profiles for the kernel and kernel modules.
[command]#kernel# — Generate per-application profiles for the kernel and kernel modules.
[command]#kill -SIGINT operf-PID#
[command]#library# — Generate per-application profiles for libraries.