It seems that is very slow to decode the Posting List...

I create a posting list with 30000 doc ids and only 2 word ids for each doc and took 35 secs to decode the posting list.. 
##### PACK THE POSTING LIST...
    my $str = '';
    for my $doc_id( 0 .. 30000 ) {
        print "Doc id:\t",$doc_id,"\n";
        $str .= (pack "I", $doc_id) | $SET_MSB;
        for my $pos ( 0 .. 2 ) {
            $str .= (pack "I", $pos) & $UNSET_MSB;
        }
    }
print "pack time \t",time()-$Aa,"\n";

# UNPACK THE POSTING LIST
my $Aaa=time();

    my $dat = {};
        my $doc_id = undef;
    for( my $i=0;$i<length $str; $i+=4) 
    {
        my $int = unpack "I", (substr $str,$i);
        if ( $int > $MSB ) 
        {
            $doc_id = unpack "I", ((pack "I", $int) & $UNSET_MSB);

        }
        else 
        {
            push @{$dat->{$doc_id}}, $int;
        }
    }

print "unpack time \t",time()-$Aaa,"\n";

[download]
pack time     2
unpack time     35

[download]


Did i make something wrong??

In reply to Re^4: Byte allign compression in Perl.. by MimisIVI
in thread Byte allign compression in Perl.. by MimisIVI

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