1.\" 2.\" Copyright (c) 2010 The FreeBSD Foundation 3.\" All rights reserved. 4.\" 5.\" This software was developed by Rui Paulo under sponsorship from the 6.\" FreeBSD Foundation. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 17.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" SUCH DAMAGE. 28.\" 29.\" $FreeBSD$ 30.\" 31.Dd September 13, 2010 32.Dt PLOCKSTAT 1 33.Os 34.Sh NAME 35.Nm plockstat 36.Nd Trace pthread lock statistics using DTrace 37.Sh SYNOPSIS 38.Nm 39.Op Fl vACHV 40.Op Fl n Ar count 41.Op Fl s Ar depth 42.Op Fl e Ar secs 43.Op Fl x Ar opt Ns = Ns Ar val 44.Ar command 45.Op arg... 46.Nm 47.Op Fl vACHV 48.Op Fl n Ar count 49.Op Fl s Ar depth 50.Op Fl e Ar secs 51.Op Fl x Ar opt Ns = Ns Ar val 52.Fl p Ar pid 53.Sh DESCRIPTION 54The 55.Nm 56utility traces pthread locks (mutexes and rwlocks) and prints statistics about 57them. 58You can use 59.Nm 60to investigate bottlenecks in your software. 61.Pp 62The following options are available: 63.Bl -tag -width indent 64.It Fl v 65Be verbose. 66.It Fl A 67Print all statistics. 68.It Fl C 69Print commulative statistics (the default). 70.It Fl H 71Print a histogram. 72.It Fl V 73Print the DTrace script about to be used to stderr. 74.It Fl n Ar count 75Set the aggregation count for the data set. 76.It Fl s Ar depth 77Set the ustack (userland stack) caller depth. 78.It Fl e Ar secs 79Does nothing at the moment. 80.It Fl x Ar opt Ns = Ns Ar val 81Specify DTrace options. 82See the 83.Xr dtrace 1 84man page for more details. 85.El 86.Sh EXIT STATUS 87.Ex -std 88.Sh SEE ALSO 89.Xr dtrace 1 , 90.Xr pthread 3 91.Sh HISTORY 92The 93.Nm 94utility comes from OpenSolaris and was first imported into 95.Fx 9.0 . 96