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Old 2012-03-06, 20:49   #1
fivemack
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Default So Sandy Bridge Xeons are now launched

http://www.anandtech.com/show/5553/t...ge-for-servers
http://www.tomshardware.com/reviews/...view,3149.html

Very fast, very expensive; will be interested to see what msieve Lanczos performance is like once someone has one of those monsters at the office.
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Old 2012-03-08, 20:53   #2
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let's wait for the 4 or 8 CPU- mobo that support them.... 64 or 128 cores... the power would be... over 9000!

Last fiddled with by firejuggler on 2012-03-08 at 20:53
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Old 2012-03-09, 00:18   #3
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The 2600 won't be usable in 4-CPU motherboards; there are going to be boards that support four E5-4600 CPUs, but nobody's got pricing for those yet, they're likely to be really quite expensive.

I will be interested to know how a dual E5-2650 compares with my quad Opteron 6168; I suspect it's comparable price (I paid £350 for each 6168) and comparable performance, using rather less electricity.
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Old 2012-03-14, 03:19   #4
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Quote:
Originally Posted by fivemack View Post
Very fast, very expensive; will be interested to see what msieve Lanczos performance is like once someone has one of those monsters at the office.
Well, I'm actually considering getting a dual E5-2687W system, with 64GB of ram, for myself. Perhaps in the next week or so.

I know this may be a silly question, but will msieve performance on 64-bit Windows be comparable to msieve performance on your Linux computer?

If I remember right, ggnfs does not have optimized assembly code for the sieving on Win64. So this means that relation gathering will take longer on Win64, correct?
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Old 2012-03-14, 07:00   #5
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Quote:
If I remember right, ggnfs does not have optimized assembly code for the sieving on Win64. So this means that relation gathering will take longer on Win64, correct?
Correct.
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Old 2012-03-14, 10:03   #6
fivemack
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Quote:
Originally Posted by WraithX View Post
I know this may be a silly question, but will msieve performance on 64-bit Windows be comparable to msieve performance on your Linux computer?
I expect performance of msieve with the native multi-threading to be the same on Linux or Windows.

My machine has sixteen memory channels and a dual-Sandy-Bridge-Xeon has 'only' eight; on the other hand the processors behind my memory channels are significantly more flimsy.

But I really don't know how the trade-offs go. In particular, I suspect this is a case where you might well want to be using MPI rather than the native multi-threading in msieve, and I don't know if that can readily be done under Windows.

Last fiddled with by fivemack on 2012-03-14 at 10:04
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Old 2012-03-14, 11:27   #7
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As I understand it, there is little to no overhead for using virtual machines so the os you boot with is not so important. Multiple os's at the same time will take a little extra memory though, but with 64 Gb that might not be a big consideration. Something to think about....
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