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Old 2014-05-04, 16:16   #12
kracker
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Intel is much faster(right now) than AMD, especially with FMA3.
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Old 2014-05-04, 16:20   #13
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But Intel servers costs much more. I was hoping that AMD's were capable of running LLR with avx but it is not the case. I will have to stick with a fleet of desktop cpu's.
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Old 2014-05-04, 20:59   #14
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Code:
Starting Lucas Lehmer Riesel prime test of 179*2^1636808-1
Using AMD K8 FFT length 112K, Pass1=448, Pass2=256
179*2^1636808-1, iteration : 10000 / 1636808 [0.61%].  Time per iteration : 3.301 ms.
@vendor_id       : AuthenticAMD
cpu family      : 15
model           : 65
model name      : Dual-Core AMD Opteron(tm) Processor 8220 SE
stepping        : 2
cpu MHz         : 2800.305
cache size      : 1024 KB

Starting Lucas Lehmer Riesel prime test of 179*2^1636808-1
Using Pentium4 FFT length 112K, Pass1=448, Pass2=256
179*2^1636808-1, iteration : 10000 / 1636808 [0.61%].  Time per iteration : 1.298 ms.
@vendor_id       : GenuineIntel
cpu family      : 6
model           : 26
model name      : Intel(R) Xeon(R) CPU           X5570  @ 2.93GHz
stepping        : 5
cpu MHz         : 2926.102
cache size      : 8192 KB
Opteron 8220 is a very old series though (~2007).
X5570 is not new either (~2009).

P.S. We are talking about multi-CPU servers here.
Quote:
Originally Posted by pinhodecarlos View Post
I was in doubt because it is much cheaper to buy an AMD server with 4 processors than one from Intel. Thank you.
Servers are conservatively clocked and quite expensive.
Tom's got some special deal at some point. Ask him.

Last fiddled with by Batalov on 2014-05-04 at 22:57
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Old 2014-05-04, 22:35   #15
kracker
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Intel i5 4670k at 4.0GHz

Code:
Starting Lucas Lehmer Riesel prime test of 179*2^1636808-1
Using FMA3 FFT length 100K, Pass1=320, Pass2=320
V1 = 4 ; Computing U0...
V1 = 4 ; Computing U0...done.
Starting Lucas-Lehmer loop...
179*2^1636808-1, iteration : 10000 / 1636808 [0.61%].  Time per iteration : 0.335 ms.
179*2^1636808-1, iteration : 20000 / 1636808 [1.22%].  Time per iteration : 0.318 ms.
179*2^1636808-1, iteration : 30000 / 1636808 [1.83%].  Time per iteration : 0.317 ms.
179*2^1636808-1, iteration : 40000 / 1636808 [2.44%].  Time per iteration : 0.317 ms.
179*2^1636808-1, iteration : 50000 / 1636808 [3.05%].  Time per iteration : 0.316 ms.
179*2^1636808-1, iteration : 60000 / 1636808 [3.66%].  Time per iteration : 0.317 ms.
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Old 2014-05-05, 07:49   #16
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The four-socket Opteron system I have cost me £4344 in April 2011

£1589 for the chassis and SSD
£1075 for sixteen 4G DIMMs
£1680 (special price) for four 1.9GHz Opteron 6168

For comparable performance on GNFS sieving, I'd now need two and a half Haswell 4770 boxes; I would have change from £2000 even if I bought three. And for linear algebra the i7-4930K box is no slower than running 48-way MPI on the Opteron, and much less disruptive (because I have to reboot the Opteron and lose all the state in the jobs on it to make the MPI work at full efficiency).

So I'd not really recommend large servers; you're paying more for the convenience than it's worth. Having 64G of memory available all at once is occasionally very useful, but you can now do that on a single-socket Socket 2011 platform.

Last fiddled with by fivemack on 2014-05-05 at 07:50
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Old 2014-05-05, 11:58   #17
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I really think for the moment the best choice is to have a fleet of Intel's i5 4670k to run some LLR. I would consider AMD servers to help NFS@home in sieving but my priority right now is LLRing.
Thank you guys.

Last fiddled with by pinhodecarlos on 2014-05-05 at 11:59
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Old 2014-05-05, 14:24   #18
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Quote:
Originally Posted by pinhodecarlos View Post
I really think for the moment the best choice is to have a fleet of Intel's i5 4670k to run some LLR. I would consider AMD servers to help NFS@home in sieving but my priority right now is LLRing.
Thank you guys.
If you don't overclock, get the 4670(not the K)
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Old 2014-05-05, 16:42   #19
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Check this budget.
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Old 2014-05-05, 16:49   #20
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Quote:
Originally Posted by pinhodecarlos View Post
Check this budget.
Hmm.. I'm assuming it's not just for LLR alone.

Also, it will be AVX, not FMA3 since it is not a Haswell CPU. You may want to wait a few more months for the 8-core Haswells to come out, but all your choice

Last fiddled with by kracker on 2014-05-05 at 16:51
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Old 2014-05-05, 18:04   #21
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Checking AMD 6380 specs it says it features:

FMA3 / 3-operand Fused Multiply-Add instructions
FMA4 / 4-operand Fused Multiply-Add instructions
AVX / Advanced Vector Extensions

I still don't understand why it is not worth to use LLR on it.
Just asked a budge for a quad 6380.

Carlos
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Old 2014-05-05, 18:16   #22
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Quote:
Originally Posted by pinhodecarlos View Post
Checking AMD 6380 specs it says it features:

FMA3 / 3-operand Fused Multiply-Add instructions
FMA4 / 4-operand Fused Multiply-Add instructions
AVX / Advanced Vector Extensions

I still don't understand why it is not worth to use LLR on it.
Just asked a budge for a quad 6380.

Carlos
AMD supports then all. But AMD CPU's suck at them, and are often faster without them.
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