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       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




       This documentation was written by Mathieu Parent


       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