ping_pong 1
ping_pong measures the ping-pong byte range lock latency
`ping_pong [options] <file> <num_locks>` `ping_pong` -r -w -m

## DESCRIPTION

This measures the ping-pong 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 managers performance under stress.

## OPTIONS

-r

  do reads

-w

  do writes

-m

  use mmap

## EXAMPLES

Testing lock coherence

          ping_pong test.dat N

Testing IO coherence

          ping_pong -rw test.dat N

## SEE ALSO

, ctdb(1), ctdbd(1)

## COPYRIGHT/LICENSE

    Copyright (C) Andrew Tridgell 2002

    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/.