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1990-02-16
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head 1.2;
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comment @@;
1.2
date 90.02.16.11.10.44; author jhh; state Exp;
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next 1.1;
1.1
date 89.01.06.09.52.11; author brent; state Exp;
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desc
@Man page for the bench program
@
1.2
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@Option to start server on signal
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@' $Header: /a/newcmds/bench/RCS/bench.man,v 1.1 89/01/06 09:52:11 brent Exp $ SPRITE (Berkeley)
.so \*(]ltmac.sprite
.HS BENCH cmds
.BS
.SH NAME
bench \- Benchmark harness that coordinates multiple processes
.SH SYNOPSIS
\fBbench\fR [\fIoptions\fR] \fB-c\fP \fIcommand\fP
.br
\fBbench\fR \fB\-M\fP [\fIoptions\fR]
.SH "OPTIONS"
.IP "\fB\-M \fInumClients\fR" 14
Run as master of the number of clients indicated.
The master bench process should be started before any slaves.
.IP "\fB\-S\fR" 14
Run as a slave. Use \fB-c\fP to specify a command. The slave
process will wait until all other slaves have registered with
the master before executing their benchmark.
.IP "\fB\-c \fIcommand args ...\fR" 14
Follow this with the command to benchmark. Execution search paths
are not used (yet). The command can be followed with any required arguments.
.IP "\fB\-p\fR" 14
Name of the pseudo-device used for coordination.
.IP "\fB\-o \fIoutfile\fR" 14
Output file in which execution statistics are placed.
.IP "\fB\-f\fR" 14
Flush the file system cache before executing the benchmark.
.IP "\fB\-x\fR" 14
Disable all system tracing before executing the benchmark.
.IP "\fB\-h\fR" 14
Enable taking of RPC timing histograms. This is ok with -x.
.IP "\fB\-d\fR" 14
Don't sync the file system cache at the end of the benchmark. Normally
this is done after the benchmark completes and before the file system
I/O statistics are taken.
.IP "\fB\-s\fR" 14
Use signals instead of pseudo-devices for rendez-vous.
.IP "\fB\-P \fIseconds\fR" 14
Pause for some seconds before getting the final statistics. Only
applies to the master bench process.
.IP "\fB\-w\fR" 14
Causes the master process to wait for a USR1 signal before it allows the
slaves to begin running. This option must be used with the \fI-M\fR option,
and cannot be used with the \fI-s\fR option.
.BE
.SH DESCRIPTION
.PP
Bench is a harness for other programs that executes them and
takes system statistics.
The command to benchmark follows the \fB-c\fP option. Currently
bench does not used the execution search path, so the command
has to be a valid pathname. (This should be fixed!)
In its simplest form (no \fB-S\fP or \fB-M\fP) bench executes a
single process and generates output to ``bench.out'' or
to the file specified by the -o option.
The default behavior is that the execution time and CPU utilization
are recorded after the benchmarked process completes,
then the file system cache is written back and
file system statistics are recorded.
The file system cache can be flushed before the benchmark using
the \fB-f\fP option. The cache write-back at the end of the
run can be disabled with the \fB-d\fP option. The \fB-x\fP option
turns off various kernel tracing that can slow down execution.
.PP
Multiple processes can be coordinated using the
\fB-M\fP and \fB-S\fP options. First a master bench process is
started with the \fB-M\fP option. This option is followed by an
integer that indicates the number of slaves to expect. The
master process creates a pseudo-device that will be used to
coordinate the slaves. Each slave benchmark is started
using the \fB-S\fP option. The slaves contact the master,
and after they all make contact the master lets them proceed.
The master bench process also takes system statistics during
the execution of all the slaves. It is generally run on
the file server in order to measure the load presented by the slaves.
Note that the master doesn't run a command itself, so no \fB-c\fP
argument is needed with \fB-M\fP.
.SH KEYWORDS
benchmark, statistics, timing
@
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@Initial revision
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