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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE refentry
PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<refentry id="ping_pong.1">
<refmeta>
<refentrytitle>ping_pong</refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo class="source">ctdb</refmiscinfo>
<refmiscinfo class="manual">CTDB - clustered TDB database</refmiscinfo>
</refmeta>
<refnamediv>
<refname>ping_pong</refname>
<refpurpose>measures the ping-pong byte range lock latency</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>ping_pong</command>
<group choice="req">
<arg choice="plain">-r</arg>
<arg choice="plain">-w</arg>
<arg choice="plain">-rw</arg>
</group>
<arg>-m</arg>
<arg>-c</arg>
<arg choice="req"><replaceable>FILENAME</replaceable></arg>
<arg choice="req"><replaceable>NUM-LOCKS</replaceable></arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>DESCRIPTION</title>
<para>
ping_pong measures the byte range lock latency. It is especially
useful on a cluster of nodes sharing a common lock manager as it
will give some indication of the lock manager's performance
under stress.
</para>
<para>
FILENAME is a file on shared storage to use for byte range
locking tests.
</para>
<para>
NUM-LOCKS is the number of byte range locks, so needs to be
(strictly) greater than the number of nodes in the cluster.
</para>
</refsect1>
<refsect1>
<title>OPTIONS</title>
<variablelist>
<varlistentry>
<term>-r</term>
<listitem>
<para>
test read performance
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>-w</term>
<listitem>
<para>
test write performance
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>-m</term>
<listitem>
<para>
use mmap
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>-c</term>
<listitem>
<para>
validate the locks
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>EXAMPLES</title>
<para>
Testing lock coherence
</para>
<screen format="linespecific">
ping_pong test.dat N
</screen>
<para>
Testing lock coherence with lock validation
</para>
<screen format="linespecific">
ping_pong -c test.dat N
</screen>
<para>
Testing IO coherence
</para>
<screen format="linespecific">
ping_pong -rw test.dat N
</screen>
</refsect1>
<refsect1>
<title>SEE ALSO</title>
<para>
<citerefentry><refentrytitle>ctdb</refentrytitle>
<manvolnum>7</manvolnum></citerefentry>,
<ulink url="https://wiki.samba.org/index.php/Ping_pong"/>
</para>
</refsect1>
<refentryinfo>
<author>
<contrib>
This documentation was written by Mathieu Parent
</contrib>
</author>
<copyright>
<year>2002</year>
<holder>Andrew Tridgell</holder>
</copyright>
<legalnotice>
<para>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of
the License, or (at your option) any later version.
</para>
<para>
This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU General Public License for more details.
</para>
<para>
You should have received a copy of the GNU General Public
License along with this program; if not, see
<ulink url="http://www.gnu.org/licenses"/>.
</para>
</legalnotice>
</refentryinfo>
</refentry>
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