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CentOS 7.0 - man page for ping_pong (centos section 1)

PING_PONG(1)				    CTDB - clustered TDB database				 PING_PONG(1)

NAME
ping_pong - measures the ping-pong byte range lock latency
SYNOPSIS
ping_pong {-r | -w | -rw} [-m] [-c] {FILENAME} {NUM-LOCKS}
DESCRIPTION
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. FILENAME is a file on shared storage to use for byte range locking tests. NUM-LOCKS is the number of byte range locks, so needs to be (strictly) greater than the number of nodes in the cluster.
OPTIONS
-r test read performance -w test write performance -m use mmap -c validate the locks
EXAMPLES
Testing lock coherence ping_pong test.dat N Testing lock coherence with lock validation ping_pong -c test.dat N Testing IO coherence ping_pong -rw test.dat N
SEE ALSO
ctdb(7), https://wiki.samba.org/index.php/Ping_pong
AUTHOR
This documentation was written by Mathieu Parent
COPYRIGHT
Copyright (C) 2002 Andrew Tridgell 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. ctdb 11/27/2013 PING_PONG(1)


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