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

       ping_pong - measures the ping-pong byte range lock latency

       ping_pong {-r | -w | -rw} [-m] [-c] {FILENAME} {NUM-LOCKS}

       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.

	   test read performance

	   test write performance

	   use mmap

	   validate the locks

       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

       ctdb(7), https://wiki.samba.org/index.php/Ping_pong

       This documentation was written by Mathieu Parent

       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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