mirror of
https://git.freebsd.org/ports.git
synced 2025-06-12 00:00:33 -04:00
105 lines
2.4 KiB
Groff
105 lines
2.4 KiB
Groff
.\" -*- coding: us-ascii -*-
|
|
.if \n(.g .ds T< \\FC
|
|
.if \n(.g .ds T> \\F[\n[.fam]]
|
|
.de URL
|
|
\\$2 \(la\\$1\(ra\\$3
|
|
..
|
|
.if \n(.g .mso www.tmac
|
|
.TH parallel 1 2009-07-02 "" ""
|
|
.SH NAME
|
|
parallel \- run programs in parallel
|
|
.SH SYNOPSIS
|
|
'nh
|
|
.fi
|
|
.ad l
|
|
\fBparallel\fR \kx
|
|
.if (\nx>(\n(.l/2)) .nr x (\n(.l/5)
|
|
'in \n(.iu+\nxu
|
|
[options] [command] \fB--\fR [argument ...]
|
|
'in \n(.iu-\nxu
|
|
.ad b
|
|
'hy
|
|
'nh
|
|
.fi
|
|
.ad l
|
|
\fBparallel\fR \kx
|
|
.if (\nx>(\n(.l/2)) .nr x (\n(.l/5)
|
|
'in \n(.iu+\nxu
|
|
[options] \fB--\fR [command ...]
|
|
'in \n(.iu-\nxu
|
|
.ad b
|
|
'hy
|
|
.SH DESCRIPTION
|
|
\fBparallel\fR runs the specified command,
|
|
passing it a single one of the specified arguments. This is
|
|
repeated for each argument. Jobs may be run in
|
|
parallel. The default is to run one job per CPU.
|
|
.PP
|
|
If no command is specified before the --,
|
|
the commands after it are instead run in parallel.
|
|
.SH OPTIONS
|
|
.TP
|
|
\*(T<\fB\-j maxjobs\fR\*(T>
|
|
Use to limit the number of jobs
|
|
that are run at the same time.
|
|
.TP
|
|
\*(T<\fB\-l maxload\fR\*(T>
|
|
Avoid starting new jobs when
|
|
the system's load average is not below
|
|
the specified limit.
|
|
.TP
|
|
\*(T<\fB\-i\fR\*(T>
|
|
Normally the command is passed the
|
|
argument at the end of its command line. With
|
|
this option, the first instance of "{}" in
|
|
the command is replaced with the argument.
|
|
.TP
|
|
\*(T<\fB\-n\fR\*(T>
|
|
Number of arguments to pass to a
|
|
command at a time. Default is 1.
|
|
Incompatible with -i
|
|
.SH EXAMPLE
|
|
'nh
|
|
.fi
|
|
.ad l
|
|
\fBparallel sh -c "echo hi; sleep 2; echo bye" -- 1 2 3\fR \kx
|
|
.if (\nx>(\n(.l/2)) .nr x (\n(.l/5)
|
|
'in \n(.iu+\nxu
|
|
'in \n(.iu-\nxu
|
|
.ad b
|
|
'hy
|
|
.PP
|
|
This runs three subshells that each print a message, delay,
|
|
and print another message. If your system has multiple
|
|
CPUs, parallel will run some of the jobs in parallel,
|
|
which should be clear from the order the messages are
|
|
output.
|
|
.PP
|
|
'nh
|
|
.fi
|
|
.ad l
|
|
\fBparallel -j 3 ufraw -o processed -- *.NEF\fR \kx
|
|
.if (\nx>(\n(.l/2)) .nr x (\n(.l/5)
|
|
'in \n(.iu+\nxu
|
|
'in \n(.iu-\nxu
|
|
.ad b
|
|
'hy
|
|
.PP
|
|
This runs three ufraw processes at the same time until
|
|
all of the NEF files have been processed.
|
|
.PP
|
|
'nh
|
|
.fi
|
|
.ad l
|
|
\fBparallel -j 3 -- ls df "echo hi"\fR \kx
|
|
.if (\nx>(\n(.l/2)) .nr x (\n(.l/5)
|
|
'in \n(.iu+\nxu
|
|
'in \n(.iu-\nxu
|
|
.ad b
|
|
'hy
|
|
.PP
|
|
This runs three independent commands in parallel.
|
|
.SH "EXIT STATUS"
|
|
Its exit status is the combination of the exit statuses of each
|
|
command ran, ORed together. (Thus, if any one command
|
|
exits nonzero, \fBparallel\fR as a whole will exit nonzero.)
|