webengine/osswebengine/WebKitTools/Scripts/parallelcl
author Simon Howkins <simonh@symbian.org>
Mon, 15 Nov 2010 14:53:34 +0000
branchRCL_3
changeset 105 871af676edac
parent 0 dd21522fd290
permissions -rw-r--r--
Adjusted to avoid exports, etc, from a top-level bld.inf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
0
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#!/usr/bin/perl
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use strict;
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use warnings;
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use File::Basename;
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use File::Spec;
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use File::Temp;
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use POSIX;
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sub makeJob(\@$);
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sub forkAndCompileFiles(\@$);
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sub Exec($);
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sub waitForChild(\@);
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sub cleanup(\@);
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my $debug = 0;
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chomp(my $clexe = `cygpath -u '$ENV{'VS80COMNTOOLS'}/../../VC/bin/cl.exe'`);
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if ($debug) {
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    print STDERR "Received " . @ARGV . " arguments:\n";
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    foreach my $arg (@ARGV) {
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        print STDERR "$arg\n";
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    }
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}
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my $commandFile;
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foreach my $arg (@ARGV) {
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    if ($arg =~ /^[\/-](E|EP|P)$/) {
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        print STDERR "The invoking process wants preprocessed source, so let's hand off this whole command to the real cl.exe\n" if $debug;
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        Exec("\"$clexe\" \"" . join('" "', @ARGV) . "\"");
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    } elsif ($arg =~ /^@(.*)$/) {
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        chomp($commandFile = `cygpath -u '$1'`);
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    }
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}
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die "No command file specified!" unless $commandFile;
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die "Couldn't find $commandFile!" unless -f $commandFile;
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my @sources;
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open(COMMAND, '<:raw:encoding(UTF16-LE):crlf:utf8', $commandFile) or die "Couldn't open $commandFile!";
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# The first line of the command file contains all the options to cl.exe plus the first (possibly quoted) filename
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my $firstLine = <COMMAND>;
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$firstLine =~ s/\r?\n$//;
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# To find the start of the first filename, look for either the last space on the line.
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# If the filename is quoted, the last character on the line will be a quote, so look for the quote before that.
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my $firstFileIndex;
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print STDERR "Last character of first line = '" . substr($firstLine, -1, 1) . "'\n" if $debug;
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if (substr($firstLine, -1, 1) eq '"') {
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    print STDERR "First file is quoted\n" if $debug;
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    $firstFileIndex = rindex($firstLine, '"', length($firstLine) - 2);
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} else {
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    print STDERR "First file is NOT quoted\n" if $debug;
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    $firstFileIndex = rindex($firstLine, ' ') + 1;
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}
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my $options = substr($firstLine, 0, $firstFileIndex) . join(' ', @ARGV[1 .. $#ARGV]);
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my $possibleFirstFile = substr($firstLine, $firstFileIndex);
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if ($possibleFirstFile =~ /\.(cpp|c)/) {
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    push(@sources, $possibleFirstFile);
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} else {
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    $options .= " $possibleFirstFile";
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}
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print STDERR "######## Found options $options ##########\n" if $debug;
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print STDERR "####### Found first source file $sources[0] ########\n" if @sources && $debug;
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# The rest of the lines of the command file just contain source files, one per line
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while (my $source = <COMMAND>) {
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    chomp($source);
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    $source =~ s/^\s+//;
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    $source =~ s/\s+$//;
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    push(@sources, $source) if length($source);
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}
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close(COMMAND);
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my $numSources = @sources;
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exit unless $numSources > 0;
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my $numJobs;
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if ($options =~ s/-j\s*([0-9]+)//) {
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    $numJobs = $1;
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} else {
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    chomp($numJobs = `num-cpus`);
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}
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print STDERR "\n\n####### RUNNING AT MOST $numJobs PARALLEL INSTANCES OF cl.exe ###########\n\n";# if $debug;
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# Magic determination of job size
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# The hope is that by splitting the source files up into 2*$numJobs pieces, we
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# won't suffer too much if one job finishes much more quickly than another.
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# However, we don't want to split it up too much due to cl.exe overhead, so set
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# the minimum job size to 5.
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my $jobSize = POSIX::ceil($numSources / (2 * $numJobs));
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$jobSize = $jobSize < 5 ? 5 : $jobSize;
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print STDERR "######## jobSize = $jobSize ##########\n" if $debug;
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# Sort the source files randomly so that we don't end up with big clumps of large files (aka SVG)
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sub fisher_yates_shuffle(\@)
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{
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    my ($array) = @_;
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    for (my $i = @{$array}; --$i; ) {
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        my $j = int(rand($i+1));
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        next if $i == $j;
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        @{$array}[$i,$j] = @{$array}[$j,$i];
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    }
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}
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fisher_yates_shuffle(@sources);    # permutes @array in place
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my @children;
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my @tmpFiles;
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my $status = 0;
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while (@sources) {
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    while (@sources && @children < $numJobs) {
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        my $pid;
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        my $tmpFile;
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        my $job = makeJob(@sources, $jobSize);
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        ($pid, $tmpFile) = forkAndCompileFiles(@{$job}, $options);
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        print STDERR "####### Spawned child with PID $pid and tmpFile $tmpFile ##########\n" if $debug;
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        push(@children, $pid);
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        push(@tmpFiles, $tmpFile);
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    }
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    $status |= waitForChild(@children);
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}
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while (@children) {
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    $status |= waitForChild(@children);
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}
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cleanup(@tmpFiles);
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exit WEXITSTATUS($status);
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   141
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sub makeJob(\@$)
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{
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    my ($files, $jobSize) = @_;
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    my @job;
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    if (@{$files} > ($jobSize * 1.5)) {
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        @job = splice(@{$files}, -$jobSize);
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    } else {
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        # Compile all the remaining files in this job to avoid having a small job later
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        @job = splice(@{$files});
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    }
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    return \@job;
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}
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   156
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sub forkAndCompileFiles(\@$)
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{
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    print STDERR "######## forkAndCompileFiles()\n" if $debug;
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    my ($files, $options) = @_;
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    if ($debug) {
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        foreach my $file (@{$files}) {
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            print STDERR "######## $file\n";
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        }
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parents:
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   166
    }
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parents:
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    my (undef, $tmpFile) = File::Temp::tempfile('clcommandXXXXX', DIR => File::Spec->tmpdir, OPEN => 0);
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   169
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    my $pid = fork();
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    die "Fork failed" unless defined($pid);
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    unless ($pid) {
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        # Child process
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        open(TMP, '>:raw:encoding(UTF16-LE):crlf:utf8', $tmpFile) or die "Couldn't open $tmpFile";
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        print TMP "$options\n";
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        foreach my $file (@{$files}) {
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            print TMP "$file\n";
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        }
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        close(TMP);
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parents:
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   181
        
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        chomp(my $winTmpFile = `cygpath -m $tmpFile`);
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parents:
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        Exec "\"$clexe\" \@\"$winTmpFile\"";
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parents:
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   184
    } else {
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        return ($pid, $tmpFile);
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parents:
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   186
    }
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parents:
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   187
}
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parents:
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   188
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   189
sub Exec($)
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   190
{
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    my ($command) = @_;
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   192
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    print STDERR "Exec($command)\n" if $debug;
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parents:
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   194
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    exec($command);
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   196
}
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parents:
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   197
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   198
sub waitForChild(\@)
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   199
{
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    my ($children) = @_;
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   201
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    return unless @{$children};
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parents:
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   203
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    my $deceased = wait();
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parents:
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   205
    my $status = $?;
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parents:
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   206
    print STDERR "######## Child with PID $deceased finished ###########\n" if $debug;
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parents:
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   207
    for (my $i = 0; $i < @{$children}; $i++) {
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parents:
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   208
        if ($children->[$i] == $deceased) {
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parents:
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   209
            splice(@{$children}, $i, 1);
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parents:
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   210
            last;
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parents:
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   211
        }
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parents:
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   212
    }
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parents:
diff changeset
   213
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parents:
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   214
    return $status;
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parents:
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   215
}
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parents:
diff changeset
   216
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parents:
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   217
sub cleanup(\@)
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   218
{
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   219
    my ($tmpFiles) = @_;
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parents:
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   220
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parents:
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   221
    foreach my $file (@{$tmpFiles}) {
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   222
        unlink $file;
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parents:
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   223
    }
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parents:
diff changeset
   224
}