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parallel: kill -USR1 now lists running jobs on STDERR

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Ole Tange 2010-01-29 09:50:39 +01:00
parent fcfc9f6d70
commit 495293ccc4
2 changed files with 128 additions and 38 deletions
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91
parallel
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@ -2,7 +2,7 @@
=head1 NAME
parallel - build and execute command lines from standard input in parallel
parallel - build and execute shell command lines from standard input in parallel
=head1 SYNOPSIS
@ -232,7 +232,24 @@ B<seq -f %04g 0 9999 | parallel -X rm pict{}.jpg>
This will also only run B<rm> as many times needed to keep the command
line length short enough.
=head1 EXAMPLE 7: Keep order of output same as order of input
=head1 EXAMPLE 7: Group output lines
When runnning jobs that output data, you often do not want the output
of multiple jobs to run together. B<parallel> defaults to grouping the
output of each job, so the output is printed when the job finishes. If
you want the output to be printed while the job is running you can use
B<-u>.
Compare the output of:
B<(echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel traceroute>
to the output of:
B<(echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel -u traceroute>
=head1 EXAMPLE 8: Keep order of output same as order of input
Normally the output of a job will be printed as soon as it
completes. Sometimes you want the order of the output to remain the
@ -240,17 +257,18 @@ same as the order of the input. B<-k> will make sure the order of
output will be in the same order as input even if later jobs end
before earlier jobs.
If you have a directory with subdirectories that contain different
amount of files running:
B<(echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel traceroute>
B<ls | sort | parallel -v "ls {} | wc">
will give the output of each dir, but it will be sorted according to
which job completed first.
will give traceroute of foss.org.my, www.debian.org and
www.freenetproject.org, but it will be sorted according to which job
completed first.
To keep the order the same as input run:
B<ls | sort | parallel -kv "ls {} | wc">
B<(echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel -k traceroute>
This will make sure the traceroute to foss.org.my will be printed
first.
=head1 QUOTING
@ -298,6 +316,15 @@ easier just to write a small script and have B<parallel> call that
script.
=head1 LIST RUNNING JOBS
To list the jobs currently running you can run:
B<killall -USR1 parallel>
B<parallel> will then print the currently running jobs on STDERR.
=head1 COMPLETE RUNNING JOBS BUT DO NOT START NEW JOBS
If you regret starting a lot of jobs you can simply break B<parallel>,
@ -319,8 +346,14 @@ B<find -exec> only works on files. So processing other input (such as
hosts or URLs) will require creating these inputs as files. B<find
-exec> has no support for running commands in parallel.
B<xargs> deals badly with special characters (such as space, ' and ")
unless B<-0> or B<-d "\n"> is specified. Many input generators are not
B<xargs> deals badly with special characters (such as space, ' and
"). To see the problem try this:
touch important_file
touch 'not important_file'
ls not* | xargs rm
You can specify B<-0> or B<-d "\n">, but many input generators are not
optimized for using B<NUL> as separator but are optimized for
B<newline> as separator. E.g B<head>, B<tail>, B<awk>, B<ls>, B<echo>,
B<sed>, B<tar -v>, B<perl> (-0 and \0 instead of \n), B<locate>
@ -395,12 +428,25 @@ Implement the missing --features
monitor to see which jobs are currently running
http://code.google.com/p/ppss/
accept signal USR1 to complete current running jobs but do not start
new jobs.
Accept signal INT to complete current running jobs but do not start
new jobs. Print out the number of jobs waiting to complete on
STDERR. Accept sig INT again to kill now. This seems to be hard, as
all foreground processes get the INT from the shell.
distibute jobs to computers with different speeds/no_of_cpu using ssh
Distibute jobs to computers with different speeds/no_of_cpu using ssh
ask the computers how many cpus they have and spawn appropriately
accoring to -j setting
according to -j setting.
http://www.semicomplete.com/blog/geekery/distributed-xargs.html?source=rss20
=head2 -S
-S sshlogin[,sshlogin]
sshlogin is [user@]host or filename with list of sshlogin
What about copying data to/from remote host?
Parallelize so this can be done:
mdm.screen find dir -execdir mdm-run cmd {} \;
@ -719,8 +765,8 @@ sub processes_available_by_system_limit {
$max_system_proc_reached = 1;
}
debug("Time to fork ten procs ", time-$time, " process ", $system_limit);
if(time-$time > 1) {
# It took more than 1 second to fork ten processes. We should stop forking.
if(time-$time > 2) {
# It took more than 2 second to fork ten processes. We should stop forking.
# Let us give the system a little slack
debug("\nLimiting processes to: $system_limit-10%=".
(int ($system_limit * 0.9)+1)."\n");
@ -742,7 +788,7 @@ sub processes_available_by_system_limit {
$system_limit, " jobs in parallel.\n");
}
if($system_limit < $wanted_processes and $spawning_too_slow) {
print STDERR ("Warning: Starting 10 extra processes takes > 1 sec.\n",
print STDERR ("Warning: Starting 10 extra processes takes > 2 sec.\n",
"Limiting to ", $system_limit, " jobs in parallel.\n");
}
# Cleanup: Close the files
@ -859,7 +905,8 @@ sub init_run_jobs {
open $Global::original_stdout, ">&STDOUT" or die "Can't dup STDOUT: $!";
open $Global::original_stderr, ">&STDERR" or die "Can't dup STDERR: $!";
$Global::running_jobs=0;
$SIG{USR1} = \&StartNoNewJobs;
$SIG{USR1} = \&ListRunningJobs;
$SIG{USR2} = \&StartNoNewJobs;
}
sub next_command_line {
@ -1024,6 +1071,12 @@ sub print_job {
# Signal handling stuff
#
sub ListRunningJobs {
for my $v (values %Global::running) {
print STDERR "parallel: ",$v->{'command'},"\n";
}
}
sub StartNoNewJobs {
$Global::StartNoNewJobs++;
}

75
parallel.1
View file

@ -124,13 +124,13 @@
.\" ========================================================================
.\"
.IX Title "PARALLEL 1"
.TH PARALLEL 1 "2009-11-10" "perl v5.10.1" "User Contributed Perl Documentation"
.TH PARALLEL 1 "2010-01-29" "perl v5.10.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
parallel \- build and execute command lines from standard input in parallel
parallel \- build and execute shell command lines from standard input in parallel
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBparallel\fR [\-0cfgkqsuvxX] [\-I str] [\-j num] [command [arguments]] < list_of_arguments
@ -333,25 +333,41 @@ You could also run:
.PP
This will also only run \fBrm\fR as many times needed to keep the command
line length short enough.
.SH "EXAMPLE 7: Keep order of output same as order of input"
.IX Header "EXAMPLE 7: Keep order of output same as order of input"
.SH "EXAMPLE 7: Group output lines"
.IX Header "EXAMPLE 7: Group output lines"
When runnning jobs that output data, you often do not want the output
of multiple jobs to run together. \fBparallel\fR defaults to grouping the
output of each job, so the output is printed when the job finishes. If
you want the output to be printed while the job is running you can use
\&\fB\-u\fR.
.PP
Compare the output of:
.PP
\&\fB(echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel traceroute\fR
.PP
to the output of:
.PP
\&\fB(echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel \-u traceroute\fR
.SH "EXAMPLE 8: Keep order of output same as order of input"
.IX Header "EXAMPLE 8: Keep order of output same as order of input"
Normally the output of a job will be printed as soon as it
completes. Sometimes you want the order of the output to remain the
same as the order of the input. \fB\-k\fR will make sure the order of
output will be in the same order as input even if later jobs end
before earlier jobs.
.PP
If you have a directory with subdirectories that contain different
amount of files running:
\&\fB(echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel traceroute\fR
.PP
\&\fBls | sort | parallel \-v \*(L"ls {} | wc\*(R"\fR
.PP
will give the output of each dir, but it will be sorted according to
which job completed first.
will give traceroute of foss.org.my, www.debian.org and
www.freenetproject.org, but it will be sorted according to which job
completed first.
.PP
To keep the order the same as input run:
.PP
\&\fBls | sort | parallel \-kv \*(L"ls {} | wc\*(R"\fR
\&\fB(echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel \-k traceroute\fR
.PP
This will make sure the traceroute to foss.org.my will be printed
first.
.SH "QUOTING"
.IX Header "QUOTING"
For more advanced use quoting may be an issue. The following will
@ -395,6 +411,13 @@ Or for substituting output:
\&\fBConclusion\fR: To avoid dealing with the quoting problems it may be
easier just to write a small script and have \fBparallel\fR call that
script.
.SH "LIST RUNNING JOBS"
.IX Header "LIST RUNNING JOBS"
To list the jobs currently running you can run:
.PP
\&\fBkillall \-USR1 parallel\fR
.PP
\&\fBparallel\fR will then print the currently running jobs on \s-1STDERR\s0.
.SH "COMPLETE RUNNING JOBS BUT DO NOT START NEW JOBS"
.IX Header "COMPLETE RUNNING JOBS BUT DO NOT START NEW JOBS"
If you regret starting a lot of jobs you can simply break \fBparallel\fR,
@ -414,8 +437,14 @@ the currently running jobs are finished.
hosts or URLs) will require creating these inputs as files. \fBfind
\&\-exec\fR has no support for running commands in parallel.
.PP
\&\fBxargs\fR deals badly with special characters (such as space, ' and ")
unless \fB\-0\fR or \fB\-d \*(L"\en\*(R"\fR is specified. Many input generators are not
\&\fBxargs\fR deals badly with special characters (such as space, ' and
"). To see the problem try this:
.PP
touch important_file
touch 'not important_file'
ls not* | xargs rm
.PP
You can specify \fB\-0\fR or \fB\-d \*(L"\en\*(R"\fR, but many input generators are not
optimized for using \fB\s-1NUL\s0\fR as separator but are optimized for
\&\fBnewline\fR as separator. E.g \fBhead\fR, \fBtail\fR, \fBawk\fR, \fBls\fR, \fBecho\fR,
\&\fBsed\fR, \fBtar \-v\fR, \fBperl\fR (\-0 and \e0 instead of \en), \fBlocate\fR
@ -481,17 +510,25 @@ Report bugs to <bug\-parallel@tange.dk>.
xargs dropin-replacement.
Implement the missing \-\-features
.PP
\&\-I <string> replacement string
.PP
monitor to see which jobs are currently running
http://code.google.com/p/ppss/
.PP
accept signal \s-1USR1\s0 to complete current running jobs but do not start
new jobs.
Accept signal \s-1INT\s0 to complete current running jobs but do not start
new jobs. Print out the number of jobs waiting to complete on
\&\s-1STDERR\s0. Accept sig \s-1INT\s0 again to kill now. This seems to be hard, as
all foreground processes get the \s-1INT\s0 from the shell.
.PP
distibute jobs to computers with different speeds/no_of_cpu using ssh
Distibute jobs to computers with different speeds/no_of_cpu using ssh
ask the computers how many cpus they have and spawn appropriately
accoring to \-j setting
according to \-j setting.
http://www.semicomplete.com/blog/geekery/distributed\-xargs.html?source=rss20
.SS "\-S"
.IX Subsection "-S"
\&\-S sshlogin[,sshlogin]
.PP
sshlogin is [user@]host or filename with list of sshlogin
.PP
What about copying data to/from remote host?
.PP
Parallelize so this can be done:
mdm.screen find dir \-execdir mdm-run cmd {} \e;