ping_pong 1 ping_pong measures the ping-pong byte range lock latency ping_pong [options] <file> <num_locks> ping_pong -r -w -m 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. -r do reads -w do writes -m use mmap Testing lock coherence ping_pong test.dat N Testing IO coherence ping_pong -rw test.dat N , ctdb(1), ctdbd(1) 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/.