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#!/usr/local/bin/perl
##
##
## Copyright (C) 1997 by Henry Kilmer and Peter Whiting.
## All rights reserved.
##
## This software may be freely copied, modified and redistributed without
## fee for non-commerical purposes provided that this copyright notice is
## preserved intact on all copies and modified copies.
##
## There is no warranty or other guarantee of fitness of this software.
## It is provided solely "as is". The author(s) disclaim(s) all
## responsibility and liability with respect to this software's usage
## or its effect upon hardware, computer systems, other software, or
## anything else.
##
##
#
# PAR - parallel processing of command
#
# par -q -n # -l logfile -c command -x -d
# -q = quiet mode (don't log anything to the logfiles)
# -n # = number of processes to run at once (default = 3)
# -l logfile = logfile to store par logging into (.0-.n)
# -c command = command to run (can also be in the list
# of routers begining with a :
# -x = view par logs as they run through xterms
# -i = run commands through interactive xterms
# -d = print debugging to stderr
#
# par takes a list of items to run a command on. If the list entry begins
# with a ":" the remainder of the line is the command to run ("{}" will be
# replaced with each subsequent item in the list. If the list entry begins
# with a "#", the entry is ignored. If a command is defined (either with
# the -c or with a : line) any entry thereafter will be applied to the
# command by replacing the {} brackets. In no cammand is defined, then each
# line is assumed to be a command to be run.
#
use Getopt::Std;
getopts('n:l:c:xidq');
$procs=$opt_n; $procs=3 if(!$procs);
$command=$opt_c;$command="{}" if(!$command);
$parlog=$opt_l; $parlog="par.log.".time if(!$parlog);
$debug=$opt_d;
if ($opt_q && ($opt_x || $opt_l)) {
print STDERR "-q nullifies -x and -l\n";
exit 1;
}
$signalled=0;
sub handler {
$signalled++;
print STDERR "Received signal - ending run ($signalled).\n";
if($signalled>1) {
printf STDERR "Ok - killing $id!\n";
kill 9, 0;
exit(1);
}
}
$SIG{'INT'} = 'handler';
$SIG{'TERM'} = 'handler';
$SIG{'QUIT'} = 'handler';
sub start {
local($cmd,$logfile)=@_;
unless ($id=fork) {
if (!$opt_q) {
local($date)=scalar localtime;
open(LOG,">>$logfile");
print(LOG "!!!!!!!\n!$date: $cmd\n!!!!!!!\n");
close(LOG);
exec "($cmd) >>$logfile";
} else {
exec "($cmd)";
}
exit 0;
}
print STDERR "Starting $cmd: process id=$id logfile=$logfile\n" if ($debug);
$id;
}
sub finish {
if(($id=wait)>0){
$logfile=$log{$id};
print STDERR "$id finished (logfile $logfile)\n" if($logfile && $debug);
$logfile;
}
}
sub watchf {
local($log)=@_;
unless(fork) { exec "xterm -e tail -f $log" ; exit 1; }
}
for($i=0;<>;$i++) {
chop;
if (/^\#/){$i--;next;}
if(/^:(.*)$/){$command=$1;$i--;next;}
if ($i<$procs) {
$logfile="running.$i"; $logfile="$parlog.$i" if (!$opt_q);
watchf($logfile) if($opt_x);
} else { $logfile=finish; }
last if $signalled;
if ($logfile) {
$cmd = $command;
$cmd =~ s/\{\}/$_/g;
$cmd = "xterm -e $cmd" if ($opt_i);
$id=start($cmd,$logfile);
$log{$id}=$logfile;
}
print STDERR "$i/$procs: $_: id=$id, log=$log{$id}\n" if ($debug);
}
if($signalled && !eof) {
$i--;
print STDERR "Signalled - not running these:\n$_\n";
while(<>){print STDERR;}
} else {
print STDERR "All work assigned. Waiting for remaining processes.\n" if ($debug);
}
$procs=$i if ($i<$procs);
while($procs) {
$procs-- if(finish);
}
print STDERR "Complete\n" if ($debug);
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