Let's buy GIMPS an Opteron! - Page 23

SalemTheCat100 · 2004-01-24, 15:06

I have a dual Opteron system with (2) Opteron 242's. The latest Prime95 client running on Windows 2000 is disappointing.

The Opterons running at 1.6ghz with SSE2 is running at 1/2 the speed of a Pentium 4 at 2.4ghz. 110ms (Opteron) vs 55ms (P4) per iteration.

Is there ANY PROGRESS in getting the bottleneck problem SOLVED?

Is there any work being done on a 64 bit client?

Salem

PrimeCruncher · 2004-01-24, 15:46

There IS work being done, and I think the problem was identified in some other thread. Any progress, George?

Xyzzy · 2004-01-24, 18:48

Quote:

Originally Posted by SalemTheCat100

The Opterons running at 1.6ghz with SSE2 is running at 1/2 the speed of a Pentium 4 at 2.4ghz. 110ms (Opteron) vs 55ms (P4) per iteration.

IMO, to be fair, you have to compare your Opterons to P4s that are rated at the same speed... How fast does a 1.6GHz P4 benchmark?

Angular · 2004-02-03, 17:14

Quote:

Originally Posted by Xyzzy

IMO, to be fair, you have to compare your Opterons to P4s that are rated at the same speed... How fast does a 1.6GHz P4 benchmark?

Here is a P4 1.6 GHz from the benchmark tread: <http://www.mersenneforum.org/showthread.php?t=59&page=1>
Intel(R) Pentium(R) 4 CPU 1.70GHz
CPU speed: 1694.64 MHz
CPU features: RDTSC, CMOV, PREFETCH, MMX, SSE, SSE2
L1 cache size: 8 KB
L2 cache size: 256 KB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 version 22.12, RdtscTiming=1
Best time for 256K FFT length: 17.666 ms.
Best time for 320K FFT length: 22.392 ms.
Best time for 384K FFT length: 26.849 ms.
Best time for 448K FFT length: 32.042 ms.
Best time for 512K FFT length: 36.454 ms.
Best time for 640K FFT length: 47.836 ms.
Best time for 768K FFT length: 57.960 ms.
Best time for 896K FFT length: 72.895 ms.
Best time for 1024K FFT length: 81.147 ms.
Best time for 1280K FFT length: 108.953 ms.
Best time for 1536K FFT length: 138.918 ms.
Best time for 1792K FFT length: 183.443 ms.

For easy reference purposes here is the 1.8GHz Opteron from earlier in the thread:

AMD Engineering Sample
CPU speed: 1799.79 MHz
CPU features: RDTSC, CMOV, PREFETCH, MMX, SSE, SSE2
L1 cache size: 64 KB
L2 cache size: 1024 KB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
L1 TLBS: 32
L2 TLBS: 512
Prime95 version 22.12, RdtscTiming=1
Best time for 256K FFT length: 16.347 ms.
Best time for 320K FFT length: 21.512 ms.
Best time for 384K FFT length: 25.947 ms.
Best time for 448K FFT length: 31.366 ms.
Best time for 512K FFT length: 34.787 ms.
Best time for 640K FFT length: 46.058 ms.
Best time for 768K FFT length: 56.882 ms.
Best time for 896K FFT length: 69.160 ms.
Best time for 1024K FFT length: 76.882 ms.
Best time for 1280K FFT length: 98.280 ms.
Best time for 1536K FFT length: 118.428 ms.
Best time for 1792K FFT length: 145.785 ms.

These are the closest two benchmarks I found, but it looks like the Opteron smokes the P4 per clock cycle. But more importantly which offers the most bang for the buck? Currently there is no competition the P4 wins hands down.

Xyzzy · 2004-02-04, 06:47

[pre]Linux opteron 2.6.2 #1 Wed Feb 4 01:34:31 EST 2004 x86_64 unknown unknown GNU/Linux[/pre]

QuintLeo · 2004-02-05, 07:28

Quote:

Originally Posted by Angular

Here is a P4 1.6 GHz from the benchmark tread:
.

More like a P4-1.7, but still pretty close.

Looks like a more-or-less dead heat untill you get up to 1.5Meg FFT range, then the Opteron starts pulling away. And at 1.7Meg (30-million-digit territory), the Opteron is a lot faster per clock.

Down side - it's NOT 1.5x times faster, while P4's are available a LOT faster than 1.5x the fastest Opteron right now.

I do wonder how the Opteron compares on Trial Factoring against a P4, though....

PrimeCruncher · 2004-02-06, 00:07

Quote:

Originally Posted by QuintLeo

I do wonder how the Opteron compares on Trial Factoring against a P4, though....

I'm also curious. Anyone have some benchmarks?

Xyzzy · 2004-02-06, 16:50

Some interesting developments:

I've backed the Opteron up, and transferred all of the scripts it ran to another Linux box, and I have installed a copy of 64-bit Windows... Microsoft is offering a free trial of this software...

So for the next few weeks, as a test, we'll be running 64-bit Windows...

What I need is for all the people who were doing development and testing to do is connect to this box using "remote desktop"... I think if you have a copy of XP on your machine you can graphically connect into the box here...

If you are interested in doing this, please email/pm me for details...

Comments are appreciated...

Xyzzy · 2004-02-06, 16:53

I think you can connect via Linux with this package:

http://www.rdesktop.org/

Edit: Wow, that was easy... I just typed in the IP address and it worked!

I'll have to figure out what port this is using so I can open a way through the firewall...

Xyzzy · 2004-02-06, 17:18

Here is what it looks like in Linux:

xilman · 2004-02-06, 17:21

Quote:

Originally Posted by Xyzzy

I think you can connect via Linux with this package:

http://www.rdesktop.org/

Edit: Wow, that was easy... I just typed in the IP address and it worked!

I'll have to figure out what port this is using so I can open a way through the firewall...

RDP: port 3389.

I think that's the only one, and I think it's only TCP and not UDP as well. Please contact me if you need more info.

Have fun.

2004-01-24, 15:06	#243
SalemTheCat100 Oct 2002 2·13 Posts	Disappointing Opteron 32-bit performance I have a dual Opteron system with (2) Opteron 242's. The latest Prime95 client running on Windows 2000 is disappointing. The Opterons running at 1.6ghz with SSE2 is running at 1/2 the speed of a Pentium 4 at 2.4ghz. 110ms (Opteron) vs 55ms (P4) per iteration. Is there ANY PROGRESS in getting the bottleneck problem SOLVED? Is there any work being done on a 64 bit client? Salem

2004-02-06, 17:18	#252
Xyzzy Aug 2002 2·3²·13·37 Posts	Here is what it looks like in Linux: Attached Thumbnails

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2004-01-24, 15:46	#244
PrimeCruncher Sep 2003 Borg HQ, Delta Quadrant 2·3³·13 Posts	There IS work being done, and I think the problem was identified in some other thread. Any progress, George?

2004-02-04, 06:47	#247
Xyzzy Aug 2002 21D2₁₆ Posts	[pre]Linux opteron 2.6.2 #1 Wed Feb 4 01:34:31 EST 2004 x86_64 unknown unknown GNU/Linux[/pre]

2004-02-06, 16:50	#250
Xyzzy Aug 2002 2·3²·13·37 Posts	Some interesting developments: I've backed the Opteron up, and transferred all of the scripts it ran to another Linux box, and I have installed a copy of 64-bit Windows... Microsoft is offering a free trial of this software... So for the next few weeks, as a test, we'll be running 64-bit Windows... What I need is for all the people who were doing development and testing to do is connect to this box using "remote desktop"... I think if you have a copy of XP on your machine you can graphically connect into the box here... If you are interested in doing this, please email/pm me for details... Comments are appreciated...

2004-02-06, 16:53	#251
Xyzzy Aug 2002 20722₈ Posts	I think you can connect via Linux with this package: http://www.rdesktop.org/ Edit: Wow, that was easy... I just typed in the IP address and it worked! I'll have to figure out what port this is using so I can open a way through the firewall...