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SIGUSR1 tells parallel to wait for running jobs to finish, but not start new jobs.

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Lazy evaluation of max_length_of_command_line and no_of_cpus
This commit is contained in:
Ole Tange 2009-10-26 12:22:21 +01:00
parent 2d930320ad
commit 5059b5453a
5 changed files with 173 additions and 33 deletions
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112
parallel
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@ -241,7 +241,7 @@ amount of files running:
B<ls | sort | parallel -v "ls {} | wc">
will give the output of each dir, but it will be sorted accoring to
will give the output of each dir, but it will be sorted according to
which job completed first.
To keep the order the same as input run:
@ -294,6 +294,18 @@ easier just to write a small script and have B<parallel> call that
script.
=head1 COMPLETE RUNNING JOBS BUT DO NOT START NEW JOBS
If you regret starting a lot of jobs you can simply break B<parallel>,
but if you want to make sure you do not have halfcompleted jobs you
should send the signal B<-USR2> to B<parallel>:
B<killall -USR2 parallel>
This will tell B<parallel> to not start any new jobs, but wait until
the currently running jobs are finished.
=head1 DIFFERENCES BETWEEN xargs/find -exec AND parallel
B<xargs> and B<find -exec> offer some of the same possibilites as
@ -323,7 +335,8 @@ run together, e.g. the first half of a line is from one process and
the last half of the line is from another process.
B<xargs> has no support for keeping the order of the output, therefore
output of the second job cannot be postponed till the first job is done.
if running jobs in parallel using B<xargs> the output of the second
job cannot be postponed till the first job is done.
B<xargs> has no support for context replace, so you will have to create the
arguments.
@ -348,6 +361,19 @@ becomes
B<ls | xargs -d "\n" -P10 -I {} bash -c "echo {}; ls {}|wc">
=head1 DIFFERENCES BETWEEN mdm/middleman AND parallel
middleman(mdm) is also a tool for running jobs in parallel.
Here are the shellscripts of http://mdm.berlios.de/usage.html ported
to parallel use:
B<seq 1 19 | parallel -j+0 buffon -o - | sort -n >>B< result>
B<cat files | parallel -j+0 cmd>
=head1 BUGS
Filenames beginning with '-' can cause some commands to give
@ -362,6 +388,29 @@ Report bugs to <bug-parallel@tange.dk>.
xargs dropin-replacement.
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.
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
Parallelize so this can be done:
mdm.screen find dir -execdir mdm-run cmd {} \;
Maybe:
find dir -execdir parallel --communication-file /tmp/comfile cmd {} \;
=head2 Comfile
This will put a lock on /tmp/comfile. The number of locks is the number of running commands.
If the number is smaller than -j then it will start a process in the background ( cmd & ),
otherwise wait.
parallel --wait /tmp/comfile will wait until no more locks on the file
=head1 AUTHOR
Copyright (C) 2007-10-18 Ole Tange, http://ole.tange.dk
@ -423,14 +472,8 @@ $Global::input_is_filename = (@ARGV);
$/="\n";
$Global::debug = (defined $::opt_d);
if(defined $::opt_x) {
$Global::xargs = 1;
$Global::command_line_max_len = max_length_of_command_line();
}
if(defined $::opt_X) {
$Global::Xargs = 1;
$Global::command_line_max_len = max_length_of_command_line();
}
if(defined $::opt_x) { $Global::xargs = 1; }
if(defined $::opt_X) { $Global::Xargs = 1; }
if(defined $::opt_v) { $Global::verbose = 1; }
if(defined $::opt_s) { $Global::verbose = 0; }
if(defined $::opt_k) { $Global::keeporder = 1; }
@ -501,7 +544,7 @@ sub generate_command_line {
# debug("arglen $arg_length = $number_of_substitution * (1 + length ($next_arg)) + $length_of_context\n");
my $job_line_length = $length_of_command_no_args + 1 + $arg_length;
# debug("linelen $job_line_length = $length_of_command_no_args + 1 + $arg_length\n");
if($job_line_length >= $Global::command_line_max_len) {
if($job_line_length >= max_length_of_command_line()) {
unget_arg(pop @quoted_args);
if($quoted_args[0]) {
last;
@ -571,12 +614,15 @@ sub shell_quote {
sub max_length_of_command_line {
# Find the max_length of a command line
# First find an upper bound
my $len = 2;
do {
$len += $len+1;
} while (is_acceptable_command_line_length($len));
# Then search for the actual max length between 0 and upper bound
return binary_find_max_length(0,$len);
if(not $Global::command_line_max_len) {
my $len = 2;
do {
$len += $len+1;
} while (is_acceptable_command_line_length($len));
# Then search for the actual max length between 0 and upper bound
$Global::command_line_max_len = binary_find_max_length(0,$len);
}
return $Global::command_line_max_len;
}
sub binary_find_max_length {
@ -755,15 +801,16 @@ sub user_requested_processes {
}
sub no_of_cpus {
my $no_of_cpus =
(no_of_cpus_gnu_linux() ||
no_of_cpus_solaris());
if($no_of_cpus) {
return $no_of_cpus;
} else {
warn("Cannot figure out no of cpus. Using 1");
return 1;
if(not $Global::no_of_cpus) {
my $no_of_cpus = (no_of_cpus_gnu_linux() || no_of_cpus_solaris());
if($no_of_cpus) {
$Global::no_of_cpus = $no_of_cpus;
} else {
warn("Cannot figure out no of cpus. Using 1");
$Global::no_of_cpus = 1;
}
}
return $Global::no_of_cpus;
}
sub no_of_cpus_gnu_linux {
@ -805,6 +852,7 @@ 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;
}
sub next_command_line {
@ -854,10 +902,12 @@ sub drain_job_queue {
sub start_more_jobs {
my $jobs_started = 0;
while($Global::running_jobs < $Global::processes_to_run
and
start_another_job()) {
$jobs_started++;
if(not $Global::StartNoNewJobs) {
while($Global::running_jobs < $Global::processes_to_run
and
start_another_job()) {
$jobs_started++;
}
}
return $jobs_started;
}
@ -967,6 +1017,10 @@ sub print_job {
# Signal handling stuff
#
sub StartNoNewJobs {
$Global::StartNoNewJobs++;
}
sub CountSigChild {
$Global::SigChildCaught++;
}

51
parallel.1
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@ -1,4 +1,4 @@
.\" Automatically generated by Pod::Man 2.1801 (Pod::Simple 3.05)
.\" Automatically generated by Pod::Man 2.22 (Pod::Simple 3.07)
.\"
.\" Standard preamble:
.\" ========================================================================
@ -124,7 +124,7 @@
.\" ========================================================================
.\"
.IX Title "PARALLEL 1"
.TH PARALLEL 1 "2009-09-02" "perl v5.10.0" "User Contributed Perl Documentation"
.TH PARALLEL 1 "2009-10-26" "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
@ -343,7 +343,7 @@ amount of files running:
.PP
\&\fBls | sort | parallel \-v \*(L"ls {} | wc\*(R"\fR
.PP
will give the output of each dir, but it will be sorted accoring to
will give the output of each dir, but it will be sorted according to
which job completed first.
.PP
To keep the order the same as input run:
@ -392,6 +392,16 @@ 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 "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,
but if you want to make sure you do not have halfcompleted jobs you
should send the signal \fB\-USR2\fR to \fBparallel\fR:
.PP
\&\fBkillall \-USR2 parallel\fR
.PP
This will tell \fBparallel\fR to not start any new jobs, but wait until
the currently running jobs are finished.
.SH "DIFFERENCES BETWEEN xargs/find \-exec AND parallel"
.IX Header "DIFFERENCES BETWEEN xargs/find -exec AND parallel"
\&\fBxargs\fR and \fBfind \-exec\fR offer some of the same possibilites as
@ -421,7 +431,8 @@ run together, e.g. the first half of a line is from one process and
the last half of the line is from another process.
.PP
\&\fBxargs\fR has no support for keeping the order of the output, therefore
output of the second job cannot be postponed till the first job is done.
if running jobs in parallel using \fBxargs\fR the output of the second
job cannot be postponed till the first job is done.
.PP
\&\fBxargs\fR has no support for context replace, so you will have to create the
arguments.
@ -445,6 +456,16 @@ and
becomes
.PP
\&\fBls | xargs \-d \*(L"\en\*(R" \-P10 \-I {} bash \-c \*(L"echo {}; ls {}|wc\*(R"\fR
.SH "DIFFERENCES BETWEEN mdm/middleman AND parallel"
.IX Header "DIFFERENCES BETWEEN mdm/middleman AND parallel"
middleman(mdm) is also a tool for running jobs in parallel.
.PP
Here are the shellscripts of http://mdm.berlios.de/usage.html ported
to parallel use:
.PP
\&\fBseq 1 19 | parallel \-j+0 buffon \-o \- | sort \-n \fR>\fB result\fR
.PP
\&\fBcat files | parallel \-j+0 cmd\fR
.SH "BUGS"
.IX Header "BUGS"
Filenames beginning with '\-' can cause some commands to give
@ -456,6 +477,28 @@ Report bugs to <bug\-parallel@tange.dk>.
.IX Header "IDEAS"
xargs dropin-replacement.
Implement the missing \-\-features
.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.
.PP
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
.PP
Parallelize so this can be done:
mdm.screen find dir \-execdir mdm-run cmd {} \e;
Maybe:
find dir \-execdir parallel \-\-communication\-file /tmp/comfile cmd {} \e;
.SS "Comfile"
.IX Subsection "Comfile"
This will put a lock on /tmp/comfile. The number of locks is the number of running commands.
If the number is smaller than \-j then it will start a process in the background ( cmd & ),
otherwise wait.
.PP
parallel \-\-wait /tmp/comfile will wait until no more locks on the file
.SH "AUTHOR"
.IX Header "AUTHOR"
Copyright (C) 2007\-10\-18 Ole Tange, http://ole.tange.dk

20
unittest/actual-results/test13
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3
unittest/tests-to-run/test13.sh
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@ -4,3 +4,6 @@
ulimit -n 50
(echo "sleep 3; echo begin"; seq 1 30 | parallel -kq echo "sleep 1; echo {}"; echo "echo end") \
| parallel -k -j0
# Test SIGUSR1
(sleep 5; killall parallel -USR1) & seq 1 100 | parallel -k sleep 3';' echo

20
unittest/wanted-results/test13
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@ -30,3 +30,23 @@ begin
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