ping_pong - Online in the Cloud

PROGRAM:

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

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