1PING_PONG(1)             CTDB - clustered TDB database            PING_PONG(1)
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NAME

6       ping_pong - measures the ping-pong byte range lock latency
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SYNOPSIS

9       ping_pong {-r | -w | -rw} [-m] [-c] {FILENAME} {NUM-LOCKS}
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DESCRIPTION

12       ping_pong measures the byte range lock latency. It is especially useful
13       on a cluster of nodes sharing a common lock manager as it will give
14       some indication of the lock manager's performance under stress.
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16       FILENAME is a file on shared storage to use for byte range locking
17       tests.
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19       NUM-LOCKS is the number of byte range locks, so needs to be (strictly)
20       greater than the number of nodes in the cluster.
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OPTIONS

23       -r
24           test read performance
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26       -w
27           test write performance
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29       -m
30           use mmap
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32       -c
33           validate the locks
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EXAMPLES

36       Testing lock coherence
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38                 ping_pong test.dat N
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41       Testing lock coherence with lock validation
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43                 ping_pong -c test.dat N
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46       Testing IO coherence
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48                 ping_pong -rw test.dat N
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SEE ALSO

52       ctdb(7), https://wiki.samba.org/index.php/Ping_pong
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AUTHOR

55       This documentation was written by Mathieu Parent
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58       Copyright © 2002 Andrew Tridgell
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60       This program is free software; you can redistribute it and/or modify it
61       under the terms of the GNU General Public License as published by the
62       Free Software Foundation; either version 3 of the License, or (at your
63       option) any later version.
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65       This program is distributed in the hope that it will be useful, but
66       WITHOUT ANY WARRANTY; without even the implied warranty of
67       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
68       General Public License for more details.
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70       You should have received a copy of the GNU General Public License along
71       with this program; if not, see http://www.gnu.org/licenses.
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76ctdb                              05/11/2019                      PING_PONG(1)
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