mirror of
https://git.savannah.gnu.org/git/parallel.git
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279 lines
7.1 KiB
Perl
Executable file
279 lines
7.1 KiB
Perl
Executable file
#!/usr/bin/perl
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=pod
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=head1 NAME
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parsort - Sort (big files) in parallel
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=head1 SYNOPSIS
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B<parsort> I<options for sort>
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=head1 DESCRIPTION
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B<parsort> uses GNU B<sort> to sort in parallel. It works just like
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B<sort> but faster on inputs with more than 1 M lines, if you have a
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multicore machine.
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Hopefully these ideas will make it into GNU Sort in the future.
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=head1 EXAMPLE
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Sort files:
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parsort *.txt > sorted.txt
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Sort stdin (standard input) numerically:
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cat numbers | parsort -n > sorted.txt
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=head1 PERFORMANCE
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B<parsort> is faster on files, because these can be read in parallel.
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On a 48 core machine you should see a speedup of 3x over B<sort>.
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=head1 AUTHOR
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Copyright (C) 2020 Ole Tange,
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http://ole.tange.dk and Free Software Foundation, Inc.
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=head1 LICENSE
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Copyright (C) 2012 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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at your option any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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=head1 DEPENDENCIES
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B<parsort> uses B<sort>, B<bash>, B<parallel>, and B<mbuffer>.
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=head1 SEE ALSO
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B<sort>
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=cut
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use strict;
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use Getopt::Long;
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use POSIX qw(mkfifo);
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Getopt::Long::Configure("bundling","require_order");
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my @ARGV_before = @ARGV;
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GetOptions(
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"debug|D" => \$opt::D,
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"version" => \$opt::version,
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"verbose|v" => \$opt::verbose,
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"b|ignore-leading-blanks" => \$opt::ignore_leading_blanks,
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"d|dictionary-order" => \$opt::dictionary_order,
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"f|ignore-case" => \$opt::ignore_case,
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"g|general-numeric-sort" => \$opt::general_numeric_sort,
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"i|ignore-nonprinting" => \$opt::ignore_nonprinting,
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"M|month-sort" => \$opt::month_sort,
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"h|human-numeric-sort" => \$opt::human_numeric_sort,
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"n|numeric-sort" => \$opt::numeric_sort,
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"N|numascii" => \$opt::numascii,
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"r|reverse" => \$opt::reverse,
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"R|random-sort" => \$opt::random_sort,
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"sort=s" => \$opt::sort,
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"V|version-sort" => \$opt::version_sort,
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"k|key=s" => \@opt::key,
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"t|field-separator=s" => \$opt::field_separator,
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"z|zero-terminated" => \$opt::zero_terminated,
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"files0-from=s" => \$opt::files0_from,
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"random-source=s" => \$opt::dummy,
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"batch-size=s" => \$opt::dummy,
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"check=s" => \$opt::dummy,
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"c" => \$opt::dummy,
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"C" => \$opt::dummy,
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"compress-program=s" => \$opt::dummy,
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"T|temporary-directory=s" => \$opt::dummy,
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"parallel=s" => \$opt::dummy,
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"u|unique" => \$opt::dummy,
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"S|buffer-size=s" => \$opt::dummy,
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"s|stable" => \$opt::dummy,
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"help" => \$opt::dummy,
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) || exit(255);
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$Global::progname = ($0 =~ m:(^|/)([^/]+)$:)[1];
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$Global::version = 20200412;
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if($opt::version) { version(); exit 0; }
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@Global::sortoptions = @ARGV_before[0..($#ARGV_before-$#ARGV-1)];
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#if($opt::zero_terminated) { $/ = "\0"; }
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$ENV{'TMPDIR'} ||= "/tmp";
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sub merge {
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# Input:
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# @cmd = commands to 'cat' (part of) a file
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my @cmd = @_;
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chomp(@cmd);
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while($#cmd > 0) {
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my @tmp;
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while($#cmd >= 0) {
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my $a = shift @cmd;
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my $b = shift @cmd;
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$a &&= "<($a)";
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$b &&= "<($b)";
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# Ignore errors from mbuffer - it gives errors when a pipe is closed
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push @tmp, "sort -m @Global::sortoptions $a $b | ".buffer();
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}
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@cmd = @tmp;
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}
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return @cmd;
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}
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sub sort_files {
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# Input is files
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my @files = @_;
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# Let GNU Parallel generate the commands to read parts of files
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# The commands split at \n and there will be at least one for each CPU thread
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open(my $par,"-|",qw(parallel --pipepart --block -1 --dryrun -vv sort),
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@Global::sortoptions, '::::', @files) || die;
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my @cmd = merge(<$par>);
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close $par;
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# The command uses <(...) so it is incompatible with /bin/sh
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open(my $bash,"|-","bash") || die;
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print $bash @cmd;
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close $bash;
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}
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sub sort_stdin {
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# Input is stdin
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# Spread the input between n processes that each sort
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# n = number of CPU threads
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my $numthreads = `parallel --number-of-threads`;
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my @fifos = map { tmpfifo() } 1..$numthreads;
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map { mkfifo($_,0600) } @fifos;
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# This trick removes the fifo as soon as it is connected in the other end
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# (rm fifo; ...) < fifo
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my @cmd = map { "(rm $_; sort @Global::sortoptions) < $_" } @fifos;
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@cmd = merge(@cmd);
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if(fork) {
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} else {
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exec(qw(parallel -j),$numthreads,
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# 1M 30M = 43s
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# 3M 30M = 59s
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# 300k 30M = 40-45s
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# 100k 30M = 47s
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# 500k 30M = 44s
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# 300k 10M = 41-45s
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# 256k 10M = 42-44s
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# 300k 3M = 42-45s
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# 300k - = 47s
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# 286k is the best mean value after testing 250..350
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qw(--block 286k --pipe --roundrobin ),buffer(),qw(> {} :::),@fifos);
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}
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# The command uses <(...) so it is incompatible with /bin/sh
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open(my $bash,"|-","bash") || die;
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print $bash @cmd;
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close $bash;
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}
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sub tmpname {
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# Select a name that does not exist
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# Do not create the file as it may be used for creating a socket (by tmux)
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# Remember the name in $Global::unlink to avoid hitting the same name twice
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my $name = shift;
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my($tmpname);
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if(not -w $ENV{'TMPDIR'}) {
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if(not -e $ENV{'TMPDIR'}) {
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::error("Tmpdir '$ENV{'TMPDIR'}' does not exist.","Try 'mkdir $ENV{'TMPDIR'}'");
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} else {
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::error("Tmpdir '$ENV{'TMPDIR'}' is not writable.","Try 'chmod +w $ENV{'TMPDIR'}'");
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}
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::wait_and_exit(255);
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}
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do {
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$tmpname = $ENV{'TMPDIR'}."/".$name.
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join"", map { (0..9,"a".."z","A".."Z")[rand(62)] } (1..5);
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} while(-e $tmpname);
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return $tmpname;
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}
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sub tmpfifo {
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# Find an unused name and mkfifo on it
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my $tmpfifo = tmpname("psort");
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mkfifo($tmpfifo,0600);
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return $tmpfifo;
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}
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{
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my $buffer;
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sub buffer {
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if(not defined $buffer) {
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if(which("mbuffker")) {
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# Use mbuffer if installed
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# 30M = 43s
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# 10M = 41-45s
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# 3M = 42-45s
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# Ignore errors from mbuffer - it gives errors when a pipe is closed
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$buffer = "mbuffer -v0 -q -m 30M";
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} else {
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$buffer = "cat";
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}
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}
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return $buffer;
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}
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}
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sub which {
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# Input:
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# @programs = programs to find the path to
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# Returns:
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# @full_path = full paths to @programs. Nothing if not found
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my @which;
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for my $prg (@_) {
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push(@which, grep { not -d $_ and -x $_ }
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map { $_."/".$prg } split(":",$ENV{'PATH'}));
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if($prg =~ m:/:) {
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# Including path
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push(@which, grep { not -d $_ and -x $_ } $prg);
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}
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}
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return wantarray ? @which : $which[0];
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}
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if(@ARGV) {
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sort_files(@ARGV);
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} elsif(length $opt::files0_from) {
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$/="\0";
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open(my $fh,"<",$opt::files0_from) || die;
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my @files = <$fh>;
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chomp(@files);
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sort_files(@files);
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} else {
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sort_stdin();
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}
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# Test
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# -z
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# OK: cat bigfile | parsort
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# OK: parsort -k4n files*.txt
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# OK: parsort files*.txt
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# OK: parsort "file with space"
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