I'm uploading files in my CGI::Application app, some of them are going to be ~4GB. I think I'm suffering from buffering or something. At the moment a 3.5GB file is failing to upload at around th 10% mark. I've checked the disk space and it's ok. I've added some debug lines to warn out some values so that I can get an idea of what's going on, but none of it is displayed until the file upload has completed. It works well for files we've tested so far, just not this large one. 
sub Upload{

    my $self = shift;
    my $q = $self->query();

    my $emailbody;
    my $bytes_retreived = 0;
    my $bufsize = 1024;
    my $buffer = '';

    my $fh                  =       $q->upload('upfile');
    my $filename    =       uc( $q->param('upfile') );

    return '' if ! $filename;

    my $tmp = File::Temp->new(
        DIR => $self->cfg('UploadDIR'),
        SUFFIX => '.zip',
        UNLINK => 0,
        );
    warn "temp file - $tmp";
    binmode $fh;
    while (read ($fh, $buffer, $bufsize))
    {
        print $tmp $buffer;
        $bytes_retreived += $bufsize;
        warn "bytes recieved: $bytes_retreived"; # I expect to see thi
+s in real time when tailing the error_log
    }
    close $fh;
    #close $tmp;

    my $file = $self->session->param('UPLOADPATH') . "/" . $filename;
    warn "file -- $file";
    move($tmp, $file) or die "file move failed $!";
    
    # some more code follows which isn't relevant to the problem.
    }

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In reply to CGI::Application file uploads buffering by Anonymous Monk

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