Hi all,

I try to create a queue for multithreaded processing of a huge image file.

Here is what i figured out:

#!/usr/bin/env perl

use strict;
use warnings;
use Data::Dump;
use Time::HiRes qw(time);
# use feature qw(say);

my $start = time;
my @queue;
my @line;

# ratio 1.25 - i guess 160 pixel
# my $width  = 20;
# my $height = 8;
# my $qsize  = 4;

# same ratio - i guess 20 MP
my $width  = 1280 * 4;
my $height = 1024 * 4;
my $qsize  = 32;

for my $x ( 0 .. $width - 1 ) {
    for my $y ( 0 .. $height - 1 ) {
        my $coords = [ $x, $y ];
        push @line, $coords;
        if ( scalar @line == $width ) {
            push @queue, [@line];
            @line = ();
            # audacious actions start here
            if ( scalar @queue == $qsize ) {
                # dd \@queue; 
                @queue = ();
            }
        }
    }
}
printf "Took %.3f seconds\n", time - $start;

__END__

karls-mac-mini:monks karl$ ./queue.pl 
Took 13.531 seconds

[download]

It looks like it works as designed.

But i can't suppress the vague feeling that this solution is ungeschickt.

How can i improve this code?

Update: Thank you very much to all that contributed to this interesting thread. I have little time this week, but when i have studied the numerous examples given, i'll reply more detailed respectively ask more questions :-)

Thank you very much for any hint and best regards,

Karl

«The Crux of the Biscuit is the Apostrophe»

In reply to Threads From Hell #3: Missing Some Basic Prerequisites [Solved] by karlgoethebier

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