---
name: "ping_pong"
section: "1"
platform: "linux"
package: "ctdb"
version: "2:4.22.11+dfsg-0+deb13u1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/ping_pong"
---

# ping\_pong(1)

measures the ping-pong byte range lock latency

## 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)](/ctdb/7.md), **https://wiki.samba.org/index.php/Ping\_pong**

## AUTHOR

This documentation was written by Mathieu Parent

## COPYRIGHT

Copyright © 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**.