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https://github.com/ceph/ceph
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68 lines
1.6 KiB
ReStructuredText
68 lines
1.6 KiB
ReStructuredText
===============
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CPU Profiling
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===============
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If you built Ceph from source and compiled Ceph for use with `oprofile`_
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you can profile Ceph's CPU usage. See `Installing Oprofile`_ for details.
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Initializing oprofile
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=====================
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The first time you use ``oprofile`` you need to initialize it. Locate the
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``vmlinux`` image corresponding to the kernel you are now running. ::
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ls /boot
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sudo opcontrol --init
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sudo opcontrol --setup --vmlinux={path-to-image} --separate=library --callgraph=6
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Starting oprofile
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=================
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To start ``oprofile`` execute the following command::
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opcontrol --start
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Once you start ``oprofile``, you may run some tests with Ceph.
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Stopping oprofile
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=================
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To stop ``oprofile`` execute the following command::
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opcontrol --stop
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Retrieving oprofile Results
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===========================
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To retrieve the top ``cmon`` results, execute the following command::
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opreport -gal ./cmon | less
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To retrieve the top ``cmon`` results with call graphs attached, execute the
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following command::
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opreport -cal ./cmon | less
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.. important:: After reviewing results, you should reset ``oprofile`` before
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running it again. Resetting ``oprofile`` removes data from the session
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directory.
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Resetting oprofile
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==================
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To reset ``oprofile``, execute the following command::
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sudo opcontrol --reset
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.. important:: You should reset ``oprofile`` after analyzing data so that
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you do not commingle results from different tests.
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.. _oprofile: http://oprofile.sourceforge.net/about/
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.. _Installing Oprofile: ../../../dev/cpu-profiler
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