Discussion related to cado-nfs

[Paul Leyland <paul.leyland@gmail.com>]

I will leave the real experts to answer your questions about CADO-NFS.  All I'll say about it at present is that it runs very well on multiple physical machines which may themselves have multiple cores.

Where I may be able to comment more authoritatively is to point you at http://www.mersenneforum.org/showthread.php?t=21398 and http://www.mersenneforum.org/showthread.php?t=20779 --- especially the latter.  Although those threads discuss the problems primarily in terms of yafu / msieve (another NFS factoring software suite, some ways worse than CADO-NFS, some ways better) there is a good deal of advice and information about the Teslacrypt ransom-ware and how to combat it over and above the technical problem of factoring a given integer.

Paul

On Sun, 2016-07-03 at 15:20 +0300, Владимир Мартьянов wrote:

Hello! First of all I want to say Thankyou for your software. It starts working just out of the box, and moreover it can be started on several mchines, it's great!

I'm working in Russian antivirus company Dr.Web and for the last 4 years I'm fighting with encoders aka cryptolockers which encrypts user's files and ask for money to decrypt them. Now we're started to deal with RSA, so we need a software to factorize integers, so I have some questions about cado-nfs.

1) How cado-nfs works on multiple-core systems? For example, I'm planning to use 32-CPU-cores servers. Should I specify threads number in commandline, or cado-nfs will scale on all the cores?

2) I want to use cado-nfs in multiple-machine mode with server and slaves. What will happens if some of the slaves will be terminated without finishing it's work? Will the master reassign it's task to other slaves?

3) Is it possible to see a statistics in multi-machine mode: how many slaves do we have, how many active slaves, how many CPU-cores etc?

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