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
    

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 m[blue]http://www.gnu.org/licensesm[].