Provided by: ctdb_4.3.8+dfsg-0ubuntu1_i386 bug

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 © 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.