How to check if the same file exists multiple times? Post: 302685029

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LEARN ABOUT CENTOS

ping_pong

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

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 (C) 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.

ctdb								    11/27/2013							      PING_PONG(1)

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