ping_pong 1 ctdb CTDB - clustered TDB database ping_pong measures the ping-pong byte range lock latency ping_pong -r -w -rw -m -c FILENAME NUM-LOCKS 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. -r test read performance -w test write performance -m use mmap -c validate the locks 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 ctdb 7, This documentation was written by Mathieu Parent 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 .