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.