samba-mirror/ctdb/doc/ping_pong.1.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
<refentry id="ping_pong.1">

<refmeta>
	<refentrytitle>ping_pong</refentrytitle>
	<manvolnum>1</manvolnum>
	<refmiscinfo class="source"> </refmiscinfo>
	<refmiscinfo class="manual"> </refmiscinfo>
</refmeta>


<refnamediv>
	<refname>ping_pong</refname>
        <refpurpose>measures the ping-pong byte range lock latency</refpurpose>
</refnamediv>

<refsynopsisdiv>
	<cmdsynopsis>
		<command>ping_pong [options] &lt;file&gt; &lt;num_locks&gt;</command>
	</cmdsynopsis>

	<cmdsynopsis>
		<command>ping_pong</command>
		<arg choice="opt">-r</arg>
		<arg choice="opt">-w</arg>
		<arg choice="opt">-m</arg>
	</cmdsynopsis>
	
</refsynopsisdiv>

  <refsect1><title>DESCRIPTION</title>
    <para>
      This measures the ping-pong 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 managers
      performance under stress.
    </para>

  </refsect1>

  <refsect1><title>OPTIONS</title>

    <variablelist>
      <varlistentry><term>-r</term>
        <listitem>
          <para>
	    do reads
	  </para>
        </listitem>
      </varlistentry>

      <varlistentry><term>-w</term>
        <listitem>
          <para>
	    do writes
	  </para>
        </listitem>
      </varlistentry>

      <varlistentry><term>-m</term>
        <listitem>
          <para>
	    use mmap
	  </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 IO coherence
    </para>
    <screen format="linespecific">
      ping_pong -rw test.dat N
    </screen>
  </refsect1>

  <refsect1><title>SEE ALSO</title>
    <para>
      <ulink url="https://wiki.samba.org/index.php/Ping_pong"/>, ctdb(1), ctdbd(1)
    </para>
  </refsect1>
  <refsect1><title>COPYRIGHT/LICENSE</title>
<literallayout>
Copyright (C) Andrew Tridgell 2002

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.

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.

You should have received a copy of the GNU General Public License
along with this program; if not, see http://www.gnu.org/licenses/.
</literallayout>
  </refsect1>
</refentry>