Combined Sieving speed

Joe O · 2006-09-05, 15:40

Prior to finding this prime a Prescott @3000Mhz was getting 204.100 kp/sec.
Now it is getting 213.111 kp/sec. This is a 4.4% increase.

Greenbank · 2006-09-11, 16:03

From 630 kp/sec to 670 kp/sec on a G5 PPC for combined sieving (173T).

Still too warm to start up the new toy but a 6.3% increase would boost it up to ~4250 kp/sec.

Brucifer · 2006-09-12, 15:34

Hmmm........ you get that new toy running and that will end the need for the rest of us sievers. One machine replaces a decent sized farm.

While it was said in jest, there's definitely a degree of truth there.

hhh · 2006-09-12, 16:14

Have you thought about underclocking it? And the harddisks are perhaps not needed? Anyways, you will not need your heater this winter. H.

Greenbank · 2006-09-13, 09:43

It won't be the end of sieving, it will just make it all faster. My Quad G5 already does combined sieving at 2720 kp/sec.

I've been toying with the idea of removing the HDDs, that should remove quite a bit of the heat. There are 96 of them :-)

I've got PXE booting working (I needed to to get around the unknown root password) so it shouldn't be too hard to build an appropriate ramdisk image for sieving...

VJS · 2006-09-13, 16:40

96 of them ???? please explain...

Greenbank · 2006-09-13, 17:22

I have two RLX 300EX chassis each with 24 blades installed.

They cost 1500 UKP each from EBay.

They look like this:-

http://www.newtech.co.jp/products/sa...ages/300ex.jpg

Each blade has a 800MHz PIII CPU, 1GB of memory and 2 x 40GB 2.5" HDDs.

So that's 2 * 24 * 800MHz = 38.4GHz of PIII goodness.
2 * 24 = 48 GB total Memory.
2 * 2 * 24 = 96 HDDs
2 * 2 * 24 * 40 = 3.84TB of HDD space

All of that in just 6U of rack space.

However, at full pelt they draw close to a 1kW of power and an awful lot of that comes back out as heat. Plus the fans make quite a bit of noise, not good in a 2 bed 1st floor (US: 2nd floor) flat (US: appartment).

Looking to move house and ideally I want somewhere with a nice cool cellar to stick all of my computer stuff in (and bicycles). Until then it only gets turned on when it's cool and the GF is away.

Chino112 · 2006-09-22, 09:34

you are cool

2006-09-05, 15:40	#1
Joe O Aug 2002 3×5²×7 Posts	Combined Sieving speed Prior to finding this prime a Prescott @3000Mhz was getting 204.100 kp/sec. Now it is getting 213.111 kp/sec. This is a 4.4% increase.

2006-09-12, 16:14	#4
hhh Jun 2005 373 Posts	Have you thought about underclocking it? And the harddisks are perhaps not needed? Anyways, you will not need your heater this winter. H. Last fiddled with by hhh on 2006-09-12 at 16:15

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2006-09-11, 16:03	#2
Greenbank Jul 2005 2·193 Posts	From 630 kp/sec to 670 kp/sec on a G5 PPC for combined sieving (173T). Still too warm to start up the new toy but a 6.3% increase would boost it up to ~4250 kp/sec.

2006-09-12, 15:34	#3
Brucifer Dec 2005 313 Posts	Hmmm........ you get that new toy running and that will end the need for the rest of us sievers. One machine replaces a decent sized farm. While it was said in jest, there's definitely a degree of truth there.

2006-09-13, 09:43	#5
Greenbank Jul 2005 2·193 Posts	It won't be the end of sieving, it will just make it all faster. My Quad G5 already does combined sieving at 2720 kp/sec. I've been toying with the idea of removing the HDDs, that should remove quite a bit of the heat. There are 96 of them :-) I've got PXE booting working (I needed to to get around the unknown root password) so it shouldn't be too hard to build an appropriate ramdisk image for sieving...

2006-09-13, 16:40	#6
VJS Dec 2004 13·23 Posts	96 of them ???? please explain...

2006-09-13, 17:22	#7
Greenbank Jul 2005 2×193 Posts	I have two RLX 300EX chassis each with 24 blades installed. They cost 1500 UKP each from EBay. They look like this:- http://www.newtech.co.jp/products/sa...ages/300ex.jpg Each blade has a 800MHz PIII CPU, 1GB of memory and 2 x 40GB 2.5" HDDs. So that's 2 * 24 * 800MHz = 38.4GHz of PIII goodness. 2 * 24 = 48 GB total Memory. 2 * 2 * 24 = 96 HDDs 2 * 2 * 24 * 40 = 3.84TB of HDD space All of that in just 6U of rack space. However, at full pelt they draw close to a 1kW of power and an awful lot of that comes back out as heat. Plus the fans make quite a bit of noise, not good in a 2 bed 1st floor (US: 2nd floor) flat (US: appartment). Looking to move house and ideally I want somewhere with a nice cool cellar to stick all of my computer stuff in (and bicycles). Until then it only gets turned on when it's cool and the GF is away.

2006-09-22, 09:34	#8
Chino112 Mar 2006 19 Posts	you are cool