strange thing happening in factordb

[EdH]

All's fine here. Uploaded and downloaded some certificate work.

Thanks, Syd. Appreciate all your efforts.

[science_man_88]

Originally Posted by akruppa

While factordb is not a part of mersenneforum, I consider behaviour like this - crapflooding the a database that so many of our members use - a serious enough offense to warrant a permanent ban from the forum. Goodbye, cmd.

if C40's can wreck it I wonder what all the C126 + 's I've got in my current sequence are doing been doing my sequence for 37 lines and all are C126 or greater.

[fivemack]

Your C126s are not being handled automatically, and there are only dozens of them rather than tens of thousands.

[science_man_88]

Originally Posted by fivemack

Your C126s are not being handled automatically, and there are only dozens of them rather than tens of thousands.

feels like it from how long they take some times if I kept all my data collection stuff properly it takes almost 400 hours to crack a low C127 by what I have written down but I haven't kept records of timings for all lines.

[science_man_88]

Originally Posted by science_man_88

feels like it from how long they take some times if I kept all my data collection stuff properly it takes almost 400 hours to crack a low C127 by what I have written down but I haven't kept records of timings for all lines.

I don't know now because I calculated that I've been doing this sequence barely 400 hours but have got 37 lines mostly completed , but I recorded the total time values the files gave me given so I may be confused.

[Random Poster]

Originally Posted by Syd

I dont know what to do about this at the moment!

Call your ISP and tell them you are under a denial-of-service attack. They should have the ability to detect and stop this sort of thing before you even notice it.

Also, while this may not immediately help the problem, make the code used by the database public. It's much easier to suggest improvements if people can see how thing are implemented currently.

[xilman]

Originally Posted by Random Poster

Also, while this may not immediately help the problem, make the code used by the database public. It's much easier to suggest improvements if people can see how thing are implemented currently.

Careful, that's a double-edged sword.

It's much easier to find ways to cause damage if people can see how thing are implemented currently.

[Random Poster]

Originally Posted by xilman

Careful, that's a double-edged sword.

It's much easier to find ways to cause damage if people can see how thing are implemented currently.

Not if things are implemented properly; if you are afraid to let people see your code, you shouldn't expose it to the Internet in the first place.

Besides, the database is in severe need of independent code review; just yesterday I saw a composite of the form 9^x-2^x without any known factors, which is ridiculous since 7 is both an algebraic factor and a single digit prime. Since the database apparently uses yafu, it should at least let yafu do its usual trial division on every entered number.

[xilman]

Originally Posted by Random Poster

Not if things are implemented properly; if you are afraid to let people see your code, you shouldn't expose it to the Internet in the first place.

True, but the critical word is the first "if" in your statement above.

If the code was implemented properly, we wouldn't be having this discussion in the first place.

[henryzz]

All prps proved upto 1300 digits. Pretty certain it shouldn't take more than an hour or two of processing a day to keep up most of the time.

[pinhodecarlos]

For factoring the database composites automatically there's a perl script available. Maybe someone could update it to use primo.

#!/bin/perl

use warnings;
use strict;
use LWP::Simple;

while(1){
    print "get composites\n";
    my $rand=int(rand(50))+13;
        my $mindig=90;
        my $contents = get("http://factorization.ath.cx/listtype.php?

t=3&mindig=$mindig&perpage=1&start=$rand&download=1");

    if (!defined $contents or $contents =~ /[a-z]/ ){
        print "$contents\n";
        print "Error, no composites fetched\n";
        sleep(60);
    }
    
    my @composites=split(/\s/, $contents);
    foreach my $composite (@composites) {
        print "Factoring ".length($composite)." digits: $composite\n";
        my @results;
        open(YAFU, "yafu siqs($composite) -p -v -threads 2|") or die "Couldn't start 

yafu!";
        while (<YAFU>) {
                print "$_";
                chomp;
            if (/^[CP].*? = (\d+)/) {
              push( @results, $1 );
            print "*****\n";
          }
        }
        close(YAFU);
        
        if ( scalar(@results) > 0 ) {
            print 

"===========================================================================\n";
            print "report factors\n";
            my $url="http://factorization.ath.cx/report.php?report=".$composite."%

3D".join('*',@results);
            #print "$url\n";
            $contents=get($url);
            #print "$contents\n";

      my $nofactors     = ($contents =~ s/Does not divide//g);
      my $already_known = ($contents =~ s/Factor already known//g);
      my $added         = ($contents =~ s/Factor added//g);
      my $small         = ($contents =~ s/Small factor//g);

      print "\tNew factors added:        " . ($added         ? $added         : 0) . "\n";
      print "\tFactors already known:    " . ($already_known ? $already_known : 0) . "\n";
      print "\tSmall factors:            " . ($small         ? $small         : 0) . "\n";
      print "\tErrors (does not divide): " . ($nofactors     ? $nofactors     : 0) . "\n";
      print "===========================================================================\n";
        }else {
            print "Error, no result found\n";
            sleep(60);
        }
    }
}
die;