251 lines
7.5 KiB
Groff
251 lines
7.5 KiB
Groff
.\" Copyright (c) 2003 Joseph Koshy. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" This software is provided by Joseph Koshy ``as is'' and
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.\" any express or implied warranties, including, but not limited to, the
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.\" implied warranties of merchantability and fitness for a particular purpose
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.\" are disclaimed. in no event shall Joseph Koshy be liable
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.\" for any direct, indirect, incidental, special, exemplary, or consequential
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.\" damages (including, but not limited to, procurement of substitute goods
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.\" or services; loss of use, data, or profits; or business interruption)
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.\" however caused and on any theory of liability, whether in contract, strict
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.\" liability, or tort (including negligence or otherwise) arising in any way
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.\" out of the use of this software, even if advised of the possibility of
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.\" such damage.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 1, 2005
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.Os
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.Dt PMCSTAT 8
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.Sh NAME
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.Nm pmcstat
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.Nd "performance measurement with performance monitoring hardware"
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.Sh SYNOPSIS
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.Nm
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.Op Fl C
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.Op Fl D Ar pathname
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.Op Fl E
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.Op Fl O Ar logfilename
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.Op Fl P Ar event-spec
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.Op Fl R Ar logfilename
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.Op Fl S Ar event-spec
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.Op Fl W
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.Op Fl c Ar cpu
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.Op Fl d
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.Op Fl g
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.Op Fl k Ar kernelfile
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.Op Fl n Ar rate
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.Op Fl o Ar outputfile
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.Op Fl p Ar event-spec
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.Op Fl s Ar event-spec
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.Op Fl t Ar pid
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.Op Fl w Ar secs
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.Op Ar command Op Ar args
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.Sh DESCRIPTION
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The
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.Nm
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utility measures system performance using the facilities provided by
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.Xr hwpmc 4 .
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.Pp
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The
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.Nm
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utility can measure both hardware events seen by the system as a
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whole, and those seen when a specified process is executing on the
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system's CPUs.
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If a specific process is being targeted (for example,
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if the
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.Fl t Ar pid
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option is specified, or if a command line is specified using
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.Ar command ) ,
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then measurement occurs till the target process exits or
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the
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.Nm
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utility is interrupted by the user.
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If a specific process is not targeted for measurement, then
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.Nm
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will perform system-wide measurements till interrupted by the
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user.
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.Pp
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A given invocation of
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.Nm
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can mix allocations of system-mode and process-mode PMCs, of both
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counting and sampling flavors.
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The values of all counting PMCs are printed in human readable form
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at regular intervals by
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.Nm .
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The output of sampling PMCs may be configured to go to a log file for
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subsequent offline analysis, or, at the expense of greater
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overhead, may be configured to be printed in text form on the fly.
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.Pp
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Hardware events to measure are specified to
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.Nm
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using event specifier strings
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.Ar event-spec .
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The syntax of these event specifiers is machine dependent and is
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documented in
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.Xr pmc 3 .
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.Pp
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A process-mode PMC may be configured to be inheritable by the target
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process' current and future children.
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.Sh OPTIONS
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The following options are available:
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.Bl -tag -width indent
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.It Fl C
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Toggle between showing cumulative or incremental counts for
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subsequent counting mode PMCs specified on the command line.
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The default is to show incremental counts.
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.It Fl D Ar pathname
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Create files with per-program samples in the directory named
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by
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.Ar pathname .
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The default is to create these files in the current directory.
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.It Fl E
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Toggle showing per-process counts at the time a tracked process
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exits for subsequent process-mode PMCs specified on the command line.
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This option is useful for mapping the performance characteristics of a
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complex pipeline of processes when used in conjunction with the
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.Fl d
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option.
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The default is to not to enable per-process tracking.
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.It Fl O Ar logfilename
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Send logging output to file
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.Ar logfilename .
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If this option is not specified and one of the logging options
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is requested, then
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.Nm
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will print a textual form of the logged events to the configured
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output file.
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.It Fl P Ar event-spec
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Allocate a process mode sampling PMC measuring hardware events
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specified in
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.Ar event-spec .
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.It Fl R Ar logfilename
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Perform offline analysis using sampling data in file
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.Ar logfilename .
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.It Fl S Ar event-spec
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Allocate a system mode sampling PMC measuring hardware events
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specified in
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.Ar event-spec .
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.It Fl W
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Toggle logging the incremental counts seen by the threads of a
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tracked process each time they are scheduled on a CPU.
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This is an experimental feature intended to help analyse the
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dynamic behaviour of processes in the system.
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It may incur substantial overhead if enabled.
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The default is for this feature to be disabled.
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.It Fl c Ar cpu
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Set the cpu for subsequent system mode PMCs specified on the
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command line to
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.Ar cpu .
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The default is to allocate system mode PMCs on CPU zero.
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.It Fl d
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Toggle between process mode PMCs measuring events for the target
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process' current and future children or only measuring events for
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the target process.
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The default is to measure events for the target process alone.
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.It Fl g
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Produce flat execution profiles in a format compatible with
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.Xr gprof 1 .
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A separate profile file is generated for each executable object
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encountered.
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Profile files are placed in sub-directories named by their PMC
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event name.
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.It Fl k Ar kernelfile
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Set the pathname of the kernel to argument
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.Ar kernelfile .
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The default is
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.Pa /boot/kernel/kernel .
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.It Fl n Ar rate
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Set the default sampling rate for subsequent sampling mode
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PMCs specified on the command line.
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The default is to configure PMCs to sample the CPU's instruction
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pointer every 65536 events.
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.It Fl o Ar outputfile
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Send counter readings and textual representations of logged data
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to file
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.Ar outputfile .
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The default is to send output to
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.Pa stderr .
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.It Fl p Ar event-spec
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Allocate a process mode counting PMC measuring hardware events
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specified in
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.Ar event-spec .
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.It Fl s Ar event-spec
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Allocate a system mode counting PMC measuring hardware events
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specified in
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.Ar event-spec .
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.It Fl t Ar pid
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Attach all process mode PMCs allocated to the process with PID
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.Ar pid .
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The option is not allowed in conjunction with specifying a
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command using
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.Ar command .
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.It Fl w Ar secs
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Print the values of all counting mode PMCs every
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.Ar secs
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seconds.
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The argument
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.Ar secs
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may be a fractional value.
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The default interval is 5 seconds.
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.El
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.Pp
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If
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.Ar command
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is specified, it is executed using
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.Xr execvp 3 .
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.Sh EXAMPLES
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To perform system-wide statistical sampling on an AMD Athlon CPU with
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samples taken every 32768 instruction retirals and data being sampled
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to file
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.Pa sample.stat ,
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use:
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.Dl "pmcstat -O sample.stat -n 32768 -S k7-retired-instructions"
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.Pp
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To execute
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.Nm mozilla
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and measure the number of data cache misses suffered
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by it and its children every 12 seconds on an AMD Athlon, use:
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.Dl "pmcstat -d -w 12 -p k7-dc-misses mozilla"
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.Pp
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To collect a system-wide samples driven by processor instructions executed
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use:
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.Dl "pmcstat -S instructions -O /tmp/sample.out"
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.Pp
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To generate
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.Xr gprof 1
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compatible flat profiles from a sample file use:
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.Dl "pmcstat -R /tmp/sample.out -g"
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.Sh DIAGNOSTICS
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.Ex -std
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.Sh SEE ALSO
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.Xr gprof 1 ,
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.Xr execvp 3 ,
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.Xr pmc 3 ,
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.Xr pmclog 3 ,
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.Xr hwpmc 4 ,
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.Xr pmccontrol 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Fx 6.0 .
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It is
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.Ud
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.Sh AUTHORS
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.An Joseph Koshy Aq jkoshy@FreeBSD.org
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.Sh BUGS
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On AMD64 platforms
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.Nm
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does not yet handle profiles with samples from 32 bit executables.
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