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'\" t
.\" Title: ping_pong
.\" Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
.\" Date: 03/26/2011
.\" Manual:
.\" Source:
.\" Language: English
.\"
.TH "PING_PONG" "1" "03/26/2011" "" ""
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
ping_pong \- measures the ping\-pong byte range lock latency
.SH "SYNOPSIS"
.HP \w'\fBping_pong\ [options]\ <file>\ <num_locks>\fR\ 'u
\fBping_pong [options] <file> <num_locks>\fR
.HP \w'\fBping_pong\fR\ 'u
\fBping_pong\fR [\-r] [\-w] [\-m]
.SH "DESCRIPTION"
.PP
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\&.
.SH "OPTIONS"
.PP
\-r
.RS 4
do reads
.RE
.PP
\-w
.RS 4
do writes
.RE
.PP
\-m
.RS 4
use mmap
.RE
.SH "EXAMPLES"
.PP
Testing lock coherence
.sp
.if n \{\
.RS 4
.\}
.nf
ping_pong test\&.dat N
.fi
.if n \{\
.RE
.\}
.PP
Testing IO coherence
.sp
.if n \{\
.RS 4
.\}
.nf
ping_pong \-rw test\&.dat N
.fi
.if n \{\
.RE
.\}
.SH "SEE ALSO"
.PP
\m[blue]\fB\%https://wiki.samba.org/index.php/Ping_pong\fR\m[], ctdb(1), ctdbd(1)
.SH "COPYRIGHT/LICENSE"
.sp
.if n \{\
.RS 4
.\}
.nf
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/\&.
.fi
.if n \{\
.RE
.\}
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