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Old 2015-06-17, 14:39   #89
hokru
 
Jun 2015

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Hi,

sorry if this is the wrong thread, Is the current version 28.6 supposed to work on "Intel E5-2630 v3 " machines?
If I run mprime -t I get "FATAL ERROR: Rounding was 0.5, expected less than 0.4".

"Optimizing for CPU architecture: Unknown Intel, L2 cache size: 256 KB, L3 cache size: 20 MB"
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Old 2015-06-18, 21:30   #90
aurashift
 
Jan 2015

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CPUs are choice for P-1 factoring over GPUs right? If so a 100M exponent P-1 job would be appreciated. I saw usage for one exponent being ~130GB for 1440 relative primes (I think). That'd allow the folks like me with more RAM to do meaningful work in P-1 if we have the RAM but not the cores.

Code:
332225851	Factored	3240959103886636916852353
History	
Date	User	Type	Result
2015-06-18	aurashift	F-PM1	Factor: 3240959103886636916852353 / (P-1, B1=3000000)
This also makes me sad on a worker that was meant for LL. When I converted to doing a 100M exponent on 12 cores down to two, most if not all of them still needed P-1 done.

Last fiddled with by aurashift on 2015-06-18 at 21:32
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Old 2015-06-18, 21:34   #91
Dubslow
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Quote:
Originally Posted by hokru View Post
Hi,

sorry if this is the wrong thread, Is the current version 28.6 supposed to work on "Intel E5-2630 v3 " machines?
If I run mprime -t I get "FATAL ERROR: Rounding was 0.5, expected less than 0.4".

"Optimizing for CPU architecture: Unknown Intel, L2 cache size: 256 KB, L3 cache size: 20 MB"
Yes that is one of the primary targets of Prime95. The test failing usually indicates some sort of hardware issue. Are you overclocking your CPU? Sufficient cooling? A bad memory stick perhaps?
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Old 2015-06-27, 16:23   #92
pepi37
 
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Dec 2011
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I need next Prime95 configuration
First worker do first PRP
Second do second PRP
Last 3&4 worker do third PRP
Is that possible and if it is , what will be configuration?
Thanks for reply
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Old 2015-06-29, 12:47   #93
wyattwong
 
Feb 2011

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Why can't I execute Prime95 in OS X Yosemite ?
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Old 2015-07-20, 03:50   #94
aurashift
 
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Quote:
Originally Posted by hokru View Post
Hi,

sorry if this is the wrong thread, Is the current version 28.6 supposed to work on "Intel E5-2630 v3 " machines?
+1

I've got some v3's and even though it detects AVX & AVX2 it still runs everything with FMA3

CPU Information:
Intel(R) Xeon(R) CPU E5-2698 v3 @ 2.30GHz
CPU speed: 2297.32 MHz, 16 hyperthreaded cores
CPU features: Prefetch, SSE, SSE2, SSE4, AVX, AVX2, FMA
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 40 MB

[Worker #2 Jul 19 21:48] Starting primality test of M74058203 using FMA3 FFT length 4M, Pass1=512, Pass2=8K, 15 threads
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Old 2015-07-20, 12:45   #95
Prime95
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Quote:
Originally Posted by aurashift View Post

I've got some v3's and even though it detects AVX & AVX2 it still runs everything with FMA3
FMA3 is the latest, greatest, fastest FFTs available in prime95.
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Old 2015-07-20, 16:02   #96
aurashift
 
Jan 2015

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Quote:
Originally Posted by Prime95 View Post
FMA3 is the latest, greatest, fastest FFTs available in prime95.
oh.. OK I thought AVX/2 was faster.
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Old 2015-07-20, 23:12   #97
ATH
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On my Sandy Bridge Prime95 uses AVX FFT like it should but on the same computer with mprime inside a VMware linux 64bit installation it uses pentium4 FFT?
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Old 2015-07-20, 23:41   #98
aurashift
 
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Quote:
Originally Posted by ATH View Post
On my Sandy Bridge Prime95 uses AVX FFT like it should but on the same computer with mprime inside a VMware linux 64bit installation it uses pentium4 FFT?
Are you exposing the physical CPU attributes to the VM? vmware might be masking the CPUs capabilities.
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Old 2015-07-21, 17:48   #99
pepi37
 
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One question for maker of Prime95 ( or anybody else who knows answer)
Lets say that I start Prime95 with 1 thread and three logical cores for PRP test. Then I shutdown Prime95 change from three to four ( and vice-versa) cores and resume computing: will that in any case make result non-confidient?
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