.\" $Id$
.TH LAT_FCNTL 8 "$Date$" "(c)1994 Larry McVoy" "LMBENCH"
.SH NAME
lat_fcntl \- measure fctl() locking latencies
.SH SYNOPSIS
.B lat_fcntl
.SH DESCRIPTION
.B lat_fcntl
uses two processes and alternately locks and unlocks files so that
only one of the processes is running at a time, similar to 
``hot potato'' message passing benchmarks.
No other work is done in the processes.
.SH OUTPUT
The reported time is in microseconds per round trip and includes the total
time, i.e., the context switching overhead is included.
Output format is like so
.sp
.ft CB
AF_UNIX sock stream latency: 491 microseconds
.ft
.SH ACKNOWLEDGEMENT
Funding for the development of
this tool was provided by Sun Microsystems Computer Corporation.
.SH "SEE ALSO"
lmbench(8), fcntl(2).