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.\"
.\" Copyright (c) 2010 The FreeBSD Foundation 
.\" All rights reserved. 
.\" 
.\" This software was developed by Rui Paulo under sponsorship from the
.\" FreeBSD Foundation. 
.\"  
.\" Redistribution and use in source and binary forms, with or without 
.\" modification, are permitted provided that the following conditions 
.\" are met: 
.\" 1. Redistributions of source code must retain the above copyright 
.\"    notice, this list of conditions and the following disclaimer. 
.\" 2. Redistributions in binary form must reproduce the above copyright 
.\"    notice, this list of conditions and the following disclaimer in the 
.\"    documentation and/or other materials provided with the distribution. 
.\" 
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
.\" SUCH DAMAGE. 
.\"
.\" $FreeBSD$
.\"
.Dd September 13, 2010
.Dt PLOCKSTAT 1
.Os
.Sh NAME
.Nm plockstat
.Nd Trace pthread lock statistics using DTrace
.Sh SYNOPSIS
.Nm
.Op Fl vACHV
.Op Fl n Ar count
.Op Fl s Ar depth
.Op Fl e Ar secs
.Op Fl x Ar opt Ns = Ns Ar val
.Ar command
.Op arg...
.Nm
.Op Fl vACHV
.Op Fl n Ar count
.Op Fl s Ar depth
.Op Fl e Ar secs
.Op Fl x Ar opt Ns = Ns Ar val
.Fl p Ar pid
.Sh DESCRIPTION
The
.Nm
utility traces pthread locks (mutexes and rwlocks) and prints statistics about
them.
You can use
.Nm
to investigate bottlenecks in your software.
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl v
Be verbose.
.It Fl A
Print all statistics.
.It Fl C
Print commulative statistics (the default).
.It Fl H
Print a histogram.
.It Fl V
Print the DTrace script about to be used to stderr.
.It Fl n Ar count
Set the aggregation count for the data set.
.It Fl s Ar depth
Set the ustack (userland stack) caller depth.
.It Fl e Ar secs
Does nothing at the moment.
.It Fl x Ar opt Ns = Ns Ar val
Specify DTrace options.
See the
.Xr dtrace 1
man page for more details.
.El
.Sh EXIT STATUS
.Ex -std
.Sh SEE ALSO
.Xr dtrace 1 ,
.Xr pthread 3
.Sh HISTORY
The
.Nm
utility comes from OpenSolaris and was first imported into
.Fx 9.0 .