mirror of
https://git.savannah.gnu.org/git/parallel.git
synced 2024-11-22 05:57:54 +00:00
niceload: Implemented --runmem, --startmem, --load, --hard, --soft. Rewritten to OO.
This commit is contained in:
Ole Tange
parent
c2a2b34abf
commit
ebeeb2755d
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@ -1,5 +1,13 @@
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= Notes on how to release new version =
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== alpha/beta/production ==
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Update documentation:
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Modified => alpha
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Unmodified alpha since last version => beta
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Unmodified beta since last version => production
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== Update version ==
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=== configure.ac ===
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@ -163,9 +171,9 @@ cc:Peter Simons <simons@cryp.to>, Sandro Cazzaniga <kharec@mandriva.org>,
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Christian Faulhammer <fauli@gentoo.org>, Ryoichiro Suzuki <ryoichiro.suzuki@gmail.com>,
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Jesse Alama <jesse.alama@gmail.com>
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Subject: GNU Parallel 20110722 ('XXX') released
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Subject: GNU Parallel 20110722 ('Murdoch') released
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GNU Parallel 20110722 ('XXX') has been released. It is
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GNU Parallel 20110722 ('Murdoch') has been released. It is
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available for download at: http://ftp.gnu.org/gnu/parallel/
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New in this release:
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526
src/niceload
526
src/niceload
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@ -12,10 +12,10 @@ B<niceload> [-v] [-h] [-n nice] [-l load] [-t time] [-s time|-f factor] -p=PID
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=head1 DESCRIPTION
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GNU B<niceload> will run a program when the load average is below a
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certain limit. When the limit is reached the program will be suspended
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for some time. Then resumed again for some time. Then the load load
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average is checked again and we start over.
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GNU B<niceload> will slow down a program when the load average is
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above a certain limit. When the limit is reached the program will be
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suspended for some time. Then resumed again for some time. Then the
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load average is checked again and we start over.
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If the load is 3.00 then the default settings will run a program
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like this:
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@ -51,9 +51,9 @@ Max load. The maximal load average before suspending command. Default
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is 1.00.
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=item B<-m> I<memory>
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=item B<--rm> I<memory>
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=item B<--mem> I<memory>
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=item B<--runmem> I<memory>
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Required free mem. I<memory> is computed as free memory + cache.
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@ -296,7 +296,7 @@ B<parallel>(1), B<nice>(1)
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use strict;
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use Getopt::Long;
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$Global::progname="niceload";
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$Global::version = 20110622;
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$Global::version = 20110718;
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Getopt::Long::Configure("bundling","require_order");
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get_options_from_array(\@ARGV) || die_usage();
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if($::opt_version) {
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@ -313,54 +313,6 @@ if($::opt_factor and $::opt_suspend) {
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exit;
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}
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my $nice = $::opt_nice || 0; # -n=0 Nice level (Default: 0)
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my $max_load = $::opt_load || 1; # -l=1 Max acceptable load average (Default: 1)
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my $check_time = $::opt_recheck || 1; # -t=1 Seconds between checking load average (Default: 1)
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my $min_mem = $::opt_mem ? multiply_binary_prefix($::opt_mem) : undef;
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my $wait_factor;
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my $wait_time = 1;
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if($::opt_suspend) {
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# --suspend=sec Seconds to suspend process when load average is too high
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$wait_time = $::opt_suspend;
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} else {
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# --factor=1 compute wait_time dynamically as (load - limit) * factor
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$wait_factor=$::opt_factor || 1;
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}
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my $processid = $::opt_pid; # Control this PID (Default: control the command)
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my $verbose = $::opt_verbose || $::opt_debug;
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my @program = @ARGV;
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$SIG{CHLD} = \&REAPER;
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if($processid) {
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$Child::fork = $processid;
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$::opt_verbose and print STDERR "Control $processid\n";
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init_signal_handling_attached_child();
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my $child_pgrp = getpgrp $Child::fork;
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suspend_resume($min_mem,$max_load,$check_time,$wait_time,$wait_factor,$child_pgrp);
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} elsif(@ARGV) {
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if($Child::fork = fork) {
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sleep 1; # Give child time to setpgrp(0,0);
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init_signal_handling_my_child();
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my $child_pgrp = getpgrp $Child::fork;
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suspend_resume($min_mem,$max_load,$check_time,$wait_time,$wait_factor,$child_pgrp);
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} else {
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setpgrp(0,0);
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debug("Child pid: $$, pgrp: ",getpgrp $$,"\n");
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if($nice) {
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unshift(@program,"nice","-n",$nice);
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}
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debug("@program\n");
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system(@program);
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debug("Child exit\n");
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exit;
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}
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} else {
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help();
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exit;
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}
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sub get_options_from_array {
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# Run GetOptions on @array
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# Returns:
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@ -381,7 +333,8 @@ sub get_options_from_array {
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"factor|f=s" => \$::opt_factor,
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"hard|H" => \$::opt_hard,
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"load|l=s" => \$::opt_load,
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"free|memory|mem|m=s" => \$::opt_mem,
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"sm|startmem|start-mem=s" => \$::opt_start_mem,
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"rm|runmem|run-mem=s" => \$::opt_run_mem,
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"nice|n=i" => \$::opt_nice,
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"noswap|N" => \$::opt_noswap,
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"process|pid|p=s" => \$::opt_pid,
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@ -413,12 +366,42 @@ Usage:
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};
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}
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sub usleep {
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# Sleep this many milliseconds.
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my $secs = shift;
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::debug("Sleeping ",$secs," millisecs\n");
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select(undef, undef, undef, $secs/1000);
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}
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sub debug {
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if($::opt_debug) {
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print STDERR @_;
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}
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}
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sub my_dump {
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# Returns:
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# ascii expression of object if Data::Dump(er) is installed
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# error code otherwise
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my @dump_this = (@_);
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eval "use Data::Dump qw(dump);";
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if ($@) {
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# Data::Dump not installed
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eval "use Data::Dumper;";
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if ($@) {
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my $err = "Neither Data::Dump nor Data::Dumper is installed\n".
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"Not dumping output\n";
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print STDERR $err;
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return $err;
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} else {
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return Dumper(@dump_this);
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}
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} else {
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eval "use Data::Dump qw(dump);";
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return (Data::Dump::dump(@dump_this));
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}
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}
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sub version {
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# Returns: N/A
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print join("\n",
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@ -432,21 +415,99 @@ sub version {
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"Web site: http://www.gnu.org/software/parallel\n"
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);
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}
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sub init_signal_handling_attached_child {
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$SIG{INT}=\&sigint_attached_child;
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sub multiply_binary_prefix {
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# Evalualte numbers with binary prefix
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# 13G = 13*1024*1024*1024 = 13958643712
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my $s = shift;
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$s =~ s/Ki?/*1024/gi;
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$s =~ s/Mi?/*1024*1024/gi;
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$s =~ s/Gi?/*1024*1024*1024/gi;
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$s =~ s/Ti?/*1024*1024*1024*1024/gi;
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$s =~ s/Pi?/*1024*1024*1024*1024*1024/gi;
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$s =~ s/Ei?/*1024*1024*1024*1024*1024*1024/gi;
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$s =~ s/Zi?/*1024*1024*1024*1024*1024*1024*1024/gi;
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$s =~ s/Yi?/*1024*1024*1024*1024*1024*1024*1024*1024/gi;
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$s =~ s/Xi?/*1024*1024*1024*1024*1024*1024*1024*1024*1024/gi;
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$s = eval $s;
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return $s;
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}
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sub sigint_attached_child {
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# Let the attached child continue when detaching
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kill_child_CONT();
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exit;
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sub max {
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# Returns:
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# Maximum value of array
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my $max;
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for (@_) {
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# Skip undefs
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defined $_ or next;
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defined $max or do { $max = $_; next; }; # Set $_ to the first non-undef
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$max = ($max > $_) ? $max : $_;
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}
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return $max;
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}
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sub init_signal_handling_my_child {
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$SIG{INT}=\&kill_child_INT;
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$SIG{TSTP}=\&kill_child_TSTP;
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$SIG{CONT}=\&kill_child_CONT;
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my $limit = Limit->new();
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my $process = Process->new($::opt_nice,@ARGV);
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if(not $::opt_pid) {
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# Wait until limit is below start_limit and run_limit
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while($limit->over_start_limit()
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or
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($limit->hard() and $limit->over_run_limit())) {
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$limit->sleep_for_recheck();
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}
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}
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$process->start();
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while($process->is_running()) {
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if($limit->over_run_limit()) {
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$process->suspend();
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$limit->sleep_for_recheck();
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if(not $limit->hard()) {
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$process->resume();
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$limit->sleep_while_running();
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}
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} else {
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$process->resume();
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$limit->sleep_while_running();
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}
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}
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package Process;
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sub new {
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my $class = shift;
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my $nice = shift;
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my @ARGV = @_;
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if($nice) {
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unshift(@ARGV, "nice", "-n", $nice);
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}
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return bless {
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'running' => 0, # Is the process running now?
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'command' => [@ARGV],
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}, ref($class) || $class;
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}
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sub start {
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# Start the program
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my $self = shift;
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::debug("Starting @{$self->{'command'}}\n");
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if($self->{'pid'} = fork) {
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# set signal handler to kill children if parent is killed
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push @{$self->{'pids'}}, $self->{'pid'};
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$Global::process = $self;
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$SIG{CHLD} = \&REAPER;
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$SIG{INT}=\&kill_child_INT;
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$SIG{TSTP}=\&kill_child_TSTP;
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$SIG{CONT}=\&kill_child_CONT;
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sleep 1; # Give child time to setpgrp(0,0);
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$self->{'pgrp'} = getpgrp $self->{'pid'};
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} else {
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setpgrp(0,0);
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::debug("Child pid: $$, pgrp: ",getpgrp $$,"\n");
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::debug("@{$self->{'command'}}\n");
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system("@{$self->{'command'}}");
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::debug("Child exit\n");
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exit;
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}
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}
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use POSIX ":sys_wait_h";
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@ -460,71 +521,200 @@ sub REAPER {
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}
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sub kill_child_CONT {
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debug("SIGCONT received. Killing $Child::fork\n");
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kill CONT => -getpgrp($Child::fork);
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my $self = $Global::process;
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::debug("SIGCONT received. Killing $self->{'pid'}\n");
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kill CONT => -getpgrp($self->{'pid'});
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}
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sub kill_child_TSTP {
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debug("SIGTSTP received. Killing $Child::fork and self\n");
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kill TSTP => -getpgrp($Child::fork);
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my $self = $Global::process;
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::debug("SIGTSTP received. Killing $self->{'pid'} and self\n");
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kill TSTP => -getpgrp($self->{'pid'});
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kill STOP => -$$;
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}
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sub kill_child_INT {
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debug("SIGINT received. Killing $Child::fork Exit\n");
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kill INT => -getpgrp($Child::fork);
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my $self = $Global::process;
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::debug("SIGINT received. Killing $self->{'pid'} Exit\n");
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kill INT => -getpgrp($self->{'pid'});
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exit;
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}
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sub suspend_resume {
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my ($min_mem,$max_load,$check_time,$wait_time,$wait_factor,@pids) = @_;
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debug("suspend_resume these @pids\n");
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resume_pids(@pids);
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while (pids_exist(@pids)) {
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my ($loadavg, $mem_free, $swap, $resume);
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if (defined $max_load and
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($loadavg = loadavg()) > $max_load) {
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if($wait_factor) {
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$wait_time = ($loadavg - $max_load) * $wait_factor;
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}
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$::opt_verbose and print STDERR "niceload: load $loadavg. Suspending for $wait_time seconds\n";
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suspend_pids(@pids);
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sleep 1; # for some reason this statement is skipped
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sleep $wait_time;
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} elsif (defined($min_mem) and
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($mem_free = mem_free()) < $min_mem) {
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$::opt_verbose and print STDERR "niceload: mem free $mem_free. Suspending for $wait_time seconds\n";
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suspend_pids(@pids);
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sleep 1; # for some reason this statement is skipped
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sleep $wait_time;
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} elsif (defined($::opt_noswap) and
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(swap_activity()) != 0) {
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$::opt_verbose and print STDERR "niceload: swapping. Suspending for $wait_time seconds\n";
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suspend_pids(@pids);
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sleep 1; # for some reason this statement is skipped
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sleep $wait_time;
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} else {
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$resume = 1;
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}
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if(not $::opt_hard or $resume) {
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resume_pids(@pids);
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$::opt_verbose and print STDERR "niceload: running for $check_time second(s)\n";
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sleep($check_time);
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}
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sub resume {
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my $self = shift;
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if(not $self->{'running'}) {
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# - = PID group
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map { kill "CONT", -$_ } @{$self->{'pids'}};
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$self->{'running'} = 1;
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}
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}
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sub pids_exist {
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my (@pids) = @_;
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my ($exists) = 0;
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for my $pid (@pids) {
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if(-e "/proc/".$pid) { $exists++ }
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#if(kill 0 => $Child::fork) { $exists++ }
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sub suspend {
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my $self = shift;
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if($self->{'running'}) {
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# - = PID group
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map { kill "STOP", -$_ } @{$self->{'pids'}};
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$self->{'running'} = 0;
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}
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}
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sub is_running {
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# The process is dead if none of the pids exist
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my $self = shift;
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my ($exists) = 0;
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for my $pid (@{$self->{'pids'}}) {
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if(kill 0 => $pid) { $exists++ }
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}
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::debug("is_running: $exists\n");
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return $exists;
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}
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sub loadavg {
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package Limit;
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sub new {
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my $class = shift;
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my %limits = @_;
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my $hard = $::opt_soft ? 0 : $::opt_hard;
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my $startmem = $::opt_start_mem ? ::multiply_binary_prefix($::opt_start_mem) : 0;
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my $runmem = $::opt_run_mem ? ::multiply_binary_prefix($::opt_run_mem) : 0;
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|
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return bless {
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'hard' => $hard,
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'recheck' => 1, # Default
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'runtime' => 1, # Default
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'load' => $::opt_load,
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'startmem' => $startmem,
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'runmem' => $runmem,
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'swap' => $::opt_noswap,
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'factor' => $::opt_factor || 1,
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'recheck' => $::opt_recheck || 1,
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'runtime' => 1,
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'over_run_limit' => 1,
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'over_start_limit' => 1,
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'verbose' => $::opt_verbose,
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}, ref($class) || $class;
|
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}
|
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|
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sub over_run_limit {
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my $self = shift;
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my $status = 0;
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if($self->{'runmem'}) {
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# mem should be between 0-10ish
|
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# 100% available => 0 (1-1)
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# 50% available => 1 (2-1)
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# 10% available => 9 (10-1)
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my $mem = $self->mem_status();
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# $status += (::max(1,$self->{'runmem'}/$mem)-1)*10;
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::debug("Run memory: $self->{'runmem'}/$mem\n");
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$status += (::max(1,$self->{'runmem'}/$mem)-1);
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}
|
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$status += $self->over_general_limit();
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$self->{'over_run_limit'} = $status;
|
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if(not $::opt_recheck) {
|
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$self->{'recheck'} = $self->{'factor'} * $self->{'over_run_limit'};
|
||||
}
|
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::debug("over_run_limit: $status\n");
|
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return $self->{'over_run_limit'};
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}
|
||||
|
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sub over_start_limit {
|
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my $self = shift;
|
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my $status = 0;
|
||||
if($self->{'startmem'}) {
|
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# mem should be between 0-10ish
|
||||
# 100% available => 0 (1-1)
|
||||
# 50% available => 1 (2-1)
|
||||
# 10% available => 9 (10-1)
|
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my $mem = $self->mem_status();
|
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# $status += (::max(1,$self->{'startmem'}/$mem)-1)*10;
|
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$status += (::max(1,$self->{'startmem'}/$mem)-1);
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}
|
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$self->{'over_start_limit'} = $status;
|
||||
if(not $::opt_recheck) {
|
||||
# Wait at least 0.5s. Otherwise niceload might cause the load
|
||||
$self->{'recheck'} = $self->{'factor'} * $self->{'over_start_limit'};
|
||||
}
|
||||
::debug("over_start_limit: $status\n");
|
||||
return $self->{'over_start_limit'};
|
||||
}
|
||||
|
||||
sub over_general_limit {
|
||||
# Return:
|
||||
# 0 if under all limits
|
||||
# >0 if over limit
|
||||
my $self = shift;
|
||||
my $status = 0;
|
||||
if($self->{'load'}) {
|
||||
# load should be between 0-10ish
|
||||
# 0 load => 0
|
||||
my $load = $self->load_status();
|
||||
$status += ::max(0,$load - $self->{'load'});
|
||||
}
|
||||
if($self->{'swap'}) {
|
||||
# swap should be between 0-10ish
|
||||
# swap in or swap out or no swap = 0
|
||||
# else log(swapin*swapout)
|
||||
my $swap = $self->swap_status();
|
||||
$status += log(::max(1, $swap - $self->{'swap'}));
|
||||
}
|
||||
if($self->{'io'}) {
|
||||
my $io = $self->io_status();
|
||||
$status += max(0,$io - $self->{'io'});
|
||||
}
|
||||
return $status;
|
||||
}
|
||||
|
||||
sub hard {
|
||||
my $self = shift;
|
||||
return $self->{'hard'};
|
||||
}
|
||||
|
||||
sub verbose {
|
||||
my $self = shift;
|
||||
return $self->{'verbose'};
|
||||
}
|
||||
|
||||
sub sleep_for_recheck {
|
||||
my $self = shift;
|
||||
if($self->{'recheck'} < 0.5) {
|
||||
# Never sleep less than 0.5 sec
|
||||
$self->{'recheck'} = 0.5;
|
||||
}
|
||||
if($self->verbose()) {
|
||||
$self->{'recheck'} = int($self->{'recheck'}*100)/100;
|
||||
print "Sleeping $self->{'recheck'}s\n";
|
||||
}
|
||||
::debug("recheck in $self->{'recheck'}s\n");
|
||||
::usleep(1000*$self->{'recheck'});
|
||||
}
|
||||
|
||||
sub sleep_while_running {
|
||||
my $self = shift;
|
||||
::debug("check in $self->{'runtime'}s\n");
|
||||
if($self->verbose()) {
|
||||
$self->{'runtime'} = int($self->{'runtime'}*100)/100;
|
||||
print "Running $self->{'runtime'}s\n";
|
||||
}
|
||||
::usleep(1); # For some reason this gets interrupted
|
||||
::usleep(1000*$self->{'runtime'});
|
||||
}
|
||||
|
||||
sub load_status {
|
||||
# Returns:
|
||||
# loadavg
|
||||
my $self = shift;
|
||||
# Cache for some seconds
|
||||
if(not defined $self->{'load_status'} or
|
||||
$self->{'load_status_cache_time'}+$self->{'recheck'} < time) {
|
||||
$self->{'load_status'} = load_status_linux();
|
||||
$self->{'load_status_cache_time'} = time;
|
||||
}
|
||||
::debug("load_status: $self->{'load_status'}\n");
|
||||
return $self->{'load_status'};
|
||||
}
|
||||
|
||||
sub load_status_linux {
|
||||
my ($loadavg);
|
||||
if(open(IN,"/proc/loadavg")) {
|
||||
# Linux specific (but fast)
|
||||
|
|
@ -547,7 +737,43 @@ sub loadavg {
|
|||
return $loadavg;
|
||||
}
|
||||
|
||||
sub mem_free {
|
||||
sub swap_status {
|
||||
# Returns:
|
||||
# (swap in)*(swap out) kb
|
||||
my $self = shift;
|
||||
# Cache for some seconds
|
||||
if(not defined $self->{'swap_status'} or
|
||||
$self->{'swap_status_cache_time'}+$self->{'recheck'} < time) {
|
||||
my $status = swap_status_linux();
|
||||
$self->{'swap_status'} = ::max($status-$self->{'swap'},0);
|
||||
$self->{'swap_status_cache_time'} = time;
|
||||
}
|
||||
::debug("swap_status: $self->{'swap_status'}\n");
|
||||
return $self->{'swap_status'};
|
||||
}
|
||||
|
||||
sub swap_status_linux {
|
||||
my $swap_activity;
|
||||
$swap_activity = "vmstat 1 2 | tail -n1 | awk '{print \$7*\$8}'";
|
||||
# Run swap_activity measuring.
|
||||
return qx{ $swap_activity };
|
||||
}
|
||||
|
||||
sub mem_status {
|
||||
# Returns:
|
||||
# number of bytes (free+cache)
|
||||
my $self = shift;
|
||||
# Cache for one second
|
||||
if(not defined $self->{'mem_status'} or
|
||||
$self->{'mem_status_cache_time'}+$self->{'recheck'} < time) {
|
||||
$self->{'mem_status'} = mem_status_linux();
|
||||
$self->{'mem_status_cache_time'} = time;
|
||||
}
|
||||
::debug("mem_status: $self->{'mem_status'}\n");
|
||||
return $self->{'mem_status'};
|
||||
}
|
||||
|
||||
sub mem_status_linux {
|
||||
# total used free shared buffers cached
|
||||
# Mem: 3366496 2901664 464832 0 179228 1850692
|
||||
# -/+ buffers/cache: 871744 2494752
|
||||
|
|
@ -557,48 +783,36 @@ sub mem_free {
|
|||
return $free*1024;
|
||||
}
|
||||
|
||||
sub swap_activity {
|
||||
my $swap_activity;
|
||||
$swap_activity = "vmstat 1 2 | tail -n1 | awk '{print \$7*\$8}'";
|
||||
# Run swap_activity measuring.
|
||||
return qx{ $swap_activity };
|
||||
}
|
||||
|
||||
sub suspend_pids {
|
||||
my @pids = @_;
|
||||
signal_pids("STOP",@pids);
|
||||
}
|
||||
|
||||
sub resume_pids {
|
||||
my @pids = @_;
|
||||
signal_pids("CONT",@pids);
|
||||
}
|
||||
|
||||
sub signal_pids {
|
||||
my ($signal,@pids) = @_;
|
||||
|
||||
# local $SIG{$signal} = 'IGNORE';
|
||||
for my $pid (@pids) {
|
||||
kill $signal => -$pid; # stop PID group
|
||||
sub io_status {
|
||||
# Returns:
|
||||
# max percent for all devices
|
||||
my $self = shift;
|
||||
# Cache for one second
|
||||
if(not defined $self->{'io_status'} or
|
||||
$self->{'io_status_cache_time'}+$self->{'recheck'} < time) {
|
||||
$self->{'io_status'} = io_status_linux();
|
||||
$self->{'io_status_cache_time'} = time;
|
||||
}
|
||||
return $self->{'io_status'};
|
||||
}
|
||||
|
||||
sub multiply_binary_prefix {
|
||||
# Evalualte numbers with binary prefix
|
||||
# 13G = 13*1024*1024*1024 = 13958643712
|
||||
my $s = shift;
|
||||
$s =~ s/Ki?/*1024/gi;
|
||||
$s =~ s/Mi?/*1024*1024/gi;
|
||||
$s =~ s/Gi?/*1024*1024*1024/gi;
|
||||
$s =~ s/Ti?/*1024*1024*1024*1024/gi;
|
||||
$s =~ s/Pi?/*1024*1024*1024*1024*1024/gi;
|
||||
$s =~ s/Ei?/*1024*1024*1024*1024*1024*1024/gi;
|
||||
$s =~ s/Zi?/*1024*1024*1024*1024*1024*1024*1024/gi;
|
||||
$s =~ s/Yi?/*1024*1024*1024*1024*1024*1024*1024*1024/gi;
|
||||
$s =~ s/Xi?/*1024*1024*1024*1024*1024*1024*1024*1024*1024/gi;
|
||||
$s = eval $s;
|
||||
return $s;
|
||||
sub io_status_linux {
|
||||
# Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
|
||||
# sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
|
||||
# sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
|
||||
# sdd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
|
||||
# sde 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
|
||||
# sdf 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
|
||||
# dm-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
|
||||
# sdg 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
|
||||
my @iostat_out = `LANG=C iostat -x 1 2`;
|
||||
# throw away all execpt the last Device:-section
|
||||
my @iostat = grep (/1/../Device:/, reverse @iostat_out);
|
||||
print @iostat;
|
||||
|
||||
my $io = (split(/\s+/,$iostat[2]))[3];
|
||||
return $io*1024;
|
||||
}
|
||||
|
||||
# Keep -w happy
|
||||
$::opt_soft = 1;
|
||||
# = 1;
|
||||
|
|
|
|||
|
|
@ -60,7 +60,8 @@ http://www.youtube.com/watch?v=1ntxT-47VPA
|
|||
=item I<command>
|
||||
|
||||
Command to execute. If I<command> or the following arguments contain
|
||||
{} every instance will be substituted with the input line.
|
||||
replacement strings (such as B<{}>) every instance will be substituted
|
||||
with the input.
|
||||
|
||||
If I<command> is given, GNU B<parallel> will behave similar to B<xargs>. If
|
||||
I<command> is not given GNU B<parallel> will behave similar to B<cat | sh>.
|
||||
|
|
|
|||
Loading…
Reference in a new issue