northwood optimizations

E_tron · 2006-01-04, 18:53

are there any further pentium 4 northwood optimizations between versions 23.4 and the current version, 24.14?

Im wondering if my northwoods should be updated. Most are not HT enabled.

Prime95 · 2006-01-04, 20:42

Yes. Version 23 was written for a 256K L2 cache. Version 24 makes use of the Northwood's larger L2 cache for many FFT lengths.

garo · 2006-01-04, 21:11

Yes definitely update to v24 for all Pentium4s and Athlon XPs and above.

patrik · 2006-01-06, 21:55

I just upgraded my clients at home to 24.14 and got good improvements for many computers. However, my Celeron D went from 0.034 s to 0.042 s per iteration for my double checks, so I went back to version 23.9 which I was running earlier. Which version is best to run for a Celeron D?

patrik · 2006-01-07, 11:45

OK, I just saw that there was only one more recent version to download, v 24.13, and that one also turned out to be slower. I think I'll have to stick with version 23.9.

For 896K FFT length on a Celeron D 3.06@3.335 GHz I get:

Code:

Version  Iteration time
23.9        0.034 s
24.13       0.040 s
24.14       0.042 s

Prime95 · 2006-01-07, 14:45

Is your Celeron D a 128K L2 cache?

PhilF · 2006-01-07, 16:23

I just did my own test on a Celeron D running at 3.57 Mhz:

For a 896K FFT:

V23.9: 28.254 ms.
V24.14: 25.992 ms.

This benchmark was done with the static linked mprime, not Prime95.

George, all Celeron D's are 256K cache. Also, the fastest 128K Celeron was 2.8 Ghz.

Prime95 · 2006-01-07, 16:36

Quote:

Originally Posted by PhilF

George, all Celeron D's are 256K cache.

Then v24 should be faster

patrik · 2006-01-08, 15:15

The times dropped after reboot, so now 24.14 is faster. Thanks for the info.

Code:

Version Iteration time
23.9       0.032 s
24.14      0.030 s

For version 24 I am running sprime since I don't have libstdc++.so.6, only libstdc++.so.5.

2006-01-04, 18:53	#1
E_tron Sep 2002 Austin, TX 3·11·17 Posts	northwood optimizations are there any further pentium 4 northwood optimizations between versions 23.4 and the current version, 24.14? Im wondering if my northwoods should be updated. Most are not HT enabled.

2006-01-06, 21:55	#4
patrik "Patrik Johansson" Aug 2002 Uppsala, Sweden 5²×17 Posts	Which version is best for Celeron D? I just upgraded my clients at home to 24.14 and got good improvements for many computers. However, my Celeron D went from 0.034 s to 0.042 s per iteration for my double checks, so I went back to version 23.9 which I was running earlier. Which version is best to run for a Celeron D?

2006-01-07, 11:45	#5
patrik "Patrik Johansson" Aug 2002 Uppsala, Sweden 5²·17 Posts	OK, I just saw that there was only one more recent version to download, v 24.13, and that one also turned out to be slower. I think I'll have to stick with version 23.9. For 896K FFT length on a Celeron D 3.06@3.335 GHz I get: Code: Version Iteration time 23.9 0.034 s 24.13 0.040 s 24.14 0.042 s

2006-01-08, 15:15	#9
patrik "Patrik Johansson" Aug 2002 Uppsala, Sweden 110101001₂ Posts	The times dropped after reboot, so now 24.14 is faster. Thanks for the info. Code: Version Iteration time 23.9 0.032 s 24.14 0.030 s For version 24 I am running sprime since I don't have libstdc++.so.6, only libstdc++.so.5. Last fiddled with by patrik on 2006-01-08 at 15:16

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2006-01-04, 20:42	#2
Prime95 P90 years forever! Aug 2002 Yeehaw, FL 1110101100110₂ Posts	Yes. Version 23 was written for a 256K L2 cache. Version 24 makes use of the Northwood's larger L2 cache for many FFT lengths.

2006-01-04, 21:11	#3
garo Aug 2002 Termonfeckin, IE 2²×691 Posts	Yes definitely update to v24 for all Pentium4s and Athlon XPs and above.

2006-01-07, 14:45	#6
Prime95 P90 years forever! Aug 2002 Yeehaw, FL 2·53·71 Posts	Is your Celeron D a 128K L2 cache?

2006-01-07, 16:23	#7
PhilF Feb 2005 Colorado 2²×7×23 Posts	I just did my own test on a Celeron D running at 3.57 Mhz: For a 896K FFT: V23.9: 28.254 ms. V24.14: 25.992 ms. This benchmark was done with the static linked mprime, not Prime95. George, all Celeron D's are 256K cache. Also, the fastest 128K Celeron was 2.8 Ghz.