Prime95 vs mprime

Sticks210 · 2014-01-01, 08:04

I've been running Prime95 on my main Windows box for a couple weeks now and have decided to give mprime a go on my Fedora home server. I'm no stranger to command line, but for the life of me I can't get it to run at 50% load in mprime like it does be default in Prime95, and it's giving me speed issues. Does anyone else using mprime experience something similar or have a fix?

Brian-E · 2014-01-01, 10:12

One weird experience with mprime which I had 2 or 3 years ago was that a particular version, and sorry I don't remember which, ran at half speed. I left this situation for months, not quite knowing what to do about it. But when I finally upgraded to install the newest version of mprime, which is something I don't readily do, it was immediately back to running at normal speed. So it's just faintly possible that installing another version of mprime could be your solution too.

EDIT: That's a response to the general "speed issues" which you mention rather than any help about setting the load yourself, which is something I don't know how to do.

ATH · 2014-01-01, 11:46

Sounds like your Windows box is hyperthreaded, which means it has for example 4 physical cores but it has 8 threads it can run. On such a machine Windows often reports only 50% cpu usage even if it runs as fast as possible.

Your Fedora system is either not hyperthreaded or Linux is better at reporting cpu usage on a hyperthreaded system.

Prime95 · 2014-01-01, 17:13

or if your machine is hyperthreaded, mprime may not be detecting which logical CPUs form the physical CPUs. Try changing your worker threads to "run on any CPU".

NBtarheel_33 · 2014-01-03, 10:26

You mentioned that the machine in question is a server. Do you know if it has multiple CPU sockets (rather than just cores)? That is, how many physical processors are plugged into the motherboard?

2014-01-01, 08:04	#1
Sticks210 Dec 2013 1 Posts	Prime95 vs mprime I've been running Prime95 on my main Windows box for a couple weeks now and have decided to give mprime a go on my Fedora home server. I'm no stranger to command line, but for the life of me I can't get it to run at 50% load in mprime like it does be default in Prime95, and it's giving me speed issues. Does anyone else using mprime experience something similar or have a fix?

2014-01-01, 10:12	#2
Brian-E "Brian" Jul 2007 The Netherlands 7×467 Posts	One weird experience with mprime which I had 2 or 3 years ago was that a particular version, and sorry I don't remember which, ran at half speed. I left this situation for months, not quite knowing what to do about it. But when I finally upgraded to install the newest version of mprime, which is something I don't readily do, it was immediately back to running at normal speed. So it's just faintly possible that installing another version of mprime could be your solution too. EDIT: That's a response to the general "speed issues" which you mention rather than any help about setting the load yourself, which is something I don't know how to do. Last fiddled with by Brian-E on 2014-01-01 at 10:14

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2014-01-01, 11:46	#3
ATH Einyen Dec 2003 Denmark 3⁵×13 Posts	Sounds like your Windows box is hyperthreaded, which means it has for example 4 physical cores but it has 8 threads it can run. On such a machine Windows often reports only 50% cpu usage even if it runs as fast as possible. Your Fedora system is either not hyperthreaded or Linux is better at reporting cpu usage on a hyperthreaded system.

2014-01-01, 17:13	#4
Prime95 P90 years forever! Aug 2002 Yeehaw, FL 2×53×71 Posts	or if your machine is hyperthreaded, mprime may not be detecting which logical CPUs form the physical CPUs. Try changing your worker threads to "run on any CPU".

2014-01-03, 10:26	#5
NBtarheel_33 "Nathan" Jul 2008 Maryland, USA 5·223 Posts	You mentioned that the machine in question is a server. Do you know if it has multiple CPU sockets (rather than just cores)? That is, how many physical processors are plugged into the motherboard?