mfaktc: a CUDA program for Mersenne prefactoring - Page 171

TObject · 2012-08-21, 20:19

Quote:

Originally Posted by James Heinrich

If you care to fiddle with mfaktc.ini::ProgressFormat a bit, GHz-days/day (%g) is probably more useful to look at than M/s (%r). This is the number you really want to maximize.

Sure. Thanks.

Three threads:
16-minute assignement - 94 GHz-days/day
8-hour assignement - 97 GHz-days/day
8-day assignement - 96 GHz-days/day

GPU load: 97%
GPU clock: 797 MHz
GPU Memory Clock: 2025 MHz

GTX 580

SievePrimes has auto-adjusted down to 2000 on all three threads. That probably means there is more performance to milk out of the GPU, but still we are somewhat close to maximum with only three threads.

That is with me using the computer (web browsing and email at the moment).

kladner · 2012-08-21, 21:21

Thanks for pointing out these options, James. Showing g-d/d is a welcome addition.

lalera · 2012-08-28, 13:28

is it possible to make a lessclasses version of mfaktc v 0.19
for win7 64bit ?
especially because of the new and fast 76bit kernel

TheJudger · 2012-08-30, 16:34

Quote:

Originally Posted by lalera

is it possible to make a lessclasses version of mfaktc v 0.19
for win7 64bit ?
especially because of the new and fast 76bit kernel

Yes, it is possible!
Windows executeables with "Less Classes": http://www.mersenneforum.org/mfaktc/...essClasses.zip

Oliver

NormanRKN · 2012-08-30, 17:25

hi!
what is the difference between the lessclasses and the stock version ?

TheJudger · 2012-08-30, 17:53

Hi Norman,

the "LessClasses" version splits the job into 96 of 420 classes instead of 960 of 4620 classes.
This version is good for short running jobs (below 1s per class with the default version) because of less overhead for class switch at the cost of a slightly lower sieve efficency (because multiples of 11 are not avoided with the residue classes).
This option is a compiletime option in src/params.h.

Oliver

NormanRKN · 2012-08-30, 18:00

thx Olli,

but I can use it for long running jobs too without any trouble ?

Norman

TheJudger · 2012-08-30, 18:04

Hi Norman,

yes, for sure. Worst case it runs a little bit slower and/or higher demand for CPU.

Oliver

Dubslow · 2012-08-30, 18:04

Quote:

Originally Posted by NormanRKN

thx Olli,

but I can use it for long running jobs too without any trouble ?

Norman

Yes, but it will be slower than the default version. It's faster for very short jobs, slower for the work that GIMPS usually does.

NormanRKN · 2012-08-30, 18:16

aaah ok!!
is there a range where "short" starts or ends to know what versions I should use or is it dependent on hardware (speed) ?

Norman

Dubslow · 2012-08-30, 18:22

Quote:

Originally Posted by NormanRKN

is there a range where "short" starts or ends to know what versions I should use or is it dependent on hardware (speed) ?

Quote:

Originally Posted by TheJudger

This version is good for short running jobs (below 1s per class with the default version)

^^^

2012-08-28, 13:28	#1873
lalera Jul 2003 13·47 Posts	i have a question is it possible to make a lessclasses version of mfaktc v 0.19 for win7 64bit ? especially because of the new and fast 76bit kernel

2012-08-30, 17:53	#1876
TheJudger "Oliver" Mar 2005 Germany 11×101 Posts	Hi Norman, the "LessClasses" version splits the job into 96 of 420 classes instead of 960 of 4620 classes. This version is good for short running jobs (below 1s per class with the default version) because of less overhead for class switch at the cost of a slightly lower sieve efficency (because multiples of 11 are not avoided with the residue classes). This option is a compiletime option in src/params.h. Oliver Last fiddled with by TheJudger on 2012-08-30 at 17:57

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2012-08-21, 21:21	#1872
kladner "Kieren" Jul 2011 In My Own Galaxy! 2·3·1,693 Posts	Thanks for pointing out these options, James. Showing g-d/d is a welcome addition.

2012-08-30, 17:25	#1875
NormanRKN Jul 2012 Saarland / Germany 2²×17 Posts	hi! what is the difference between the lessclasses and the stock version ?

2012-08-30, 18:00	#1877
NormanRKN Jul 2012 Saarland / Germany 1000100₂ Posts	thx Olli, but I can use it for long running jobs too without any trouble ? Norman

2012-08-30, 18:04	#1878
TheJudger "Oliver" Mar 2005 Germany 11×101 Posts	Hi Norman, yes, for sure. Worst case it runs a little bit slower and/or higher demand for CPU. Oliver

2012-08-30, 18:16	#1880
NormanRKN Jul 2012 Saarland / Germany 104₈ Posts	aaah ok!! is there a range where "short" starts or ends to know what versions I should use or is it dependent on hardware (speed) ? Norman