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[Cado-nfs-discuss] Computation on multi-socket server


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  • From: Valentin Janser <valentin@wans-janser.de>
  • To: cado-nfs-discuss@lists.gforge.inria.fr
  • Subject: [Cado-nfs-discuss] Computation on multi-socket server
  • Date: Wed, 15 Apr 2020 02:12:29 +0200
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Hello there,


in the last time I get more and more interested in your project.

That's why I upgraded one of my servers from a single E5-2680 to two
E5-2680s.

For testing purposes I used the RSA-100-number from the wikipedia page
"rsa numbers"
(1522605027922533360535618378132637429718068114961380688657908494580122963258952897654000350692006139).

With one single CPU I get: CPU time: 10574s    WCT: 911s

With both CPUs I get:         CPU time: 24070s    WCT: 987s.

I use the following command: ./cado-nfs.py <number> server.ssl=no
--server-threads <16/32> --slaves <8/16> --client-threads 2

The CPU usage is nearly 100 % in both cases.


Why does the second CPU not achieve any speedup whatsoever?

Do you need futher debug information?


Thanks in advance!


Valentin Janser




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