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Old 2002-08-21, 20:45   #1
Tasuke
 
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Default 4096 P4 help wanted

I am going to be running a 77.9 M on a fast P4, that has The highest quality PC2700 i could get my hands on(cl2 @190, CL2.5@220) I would like to see some benchmarks of 2.4-2.5 Ghz P4's(to eliminate processor speed as a variable) doing 4096 ffts. Also what ram timings, type of ram,and chipset are you using. Anyone who can help will be well appreciated. I will be posting my timings as I get them tonight. Thanks.
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Old 2002-08-21, 21:20   #2
Xyzzy
 
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Is it 4096K or 4608K? I ask because for the time I did mine (I gave up after 2 weeks!) I used a 4608K FFT...
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Old 2002-08-21, 21:32   #3
Tasuke
 
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from the status page at mersenne.org

[code:1]69100000 79300000 562,700 0 299,584 0 0 263,116 0.35 8,866,276 2.604 4096 [/code:1]
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Old 2002-08-22, 00:41   #4
Prime95
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P4 2.329 GHz is 246 milliseconds

PC870 RDRAM


Note: Version 23 will likely speed this up by 7% (or more).
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Old 2002-08-22, 03:04   #5
Tasuke
 
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ok, P4 2.46ghz DDR308 cl2

244 ms(average 100 iterations)

Lemme find a keyboard and i will try 4/5 (cpu/ram) and some other CL values.

I should be able to get DDR380, 266, 333, and 400(2 systems)

/edit version 22.8 knocked a ms off the time versus 22.7. That is nearly 22 hours saved.
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Old 2002-08-22, 05:31   #6
xtreme2k
 
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How to benchmark such high FFT size?
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Old 2002-08-22, 05:39   #7
Tasuke
 
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in the advanced menu choose time and enter 77900000 for the exponent size, and a number for the #of iterations(i use 100 as there are many things that can skew a benchmark, the larger sample size helps keep errors too a minimum)

Then take the total time and divide by the number of iterations for an average, or use the best time and post it. I like to use the average, but I am not picky.

And thank you.
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Old 2002-08-22, 05:45   #8
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~224ms

P4 1.8@ 2520MHz
RD1120
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Old 2002-08-22, 22:21   #9
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This thing is pretty linear until some 'outside' factor kicks in, such as the cache size limitation. Let t be the table size and s be the time in miliseconds, my XP 1800+ is roughly

s = 0.1t - 4

It gives me ~400 ms for ~4000k table size but my test told me 466. Need another approximation once the 256k cache shows.

For 512k cache, I suspect it is linear till ~4000k. Once we are in the 200 day range, a day or two wont matter as much.
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Old 2002-08-22, 23:10   #10
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Default some data...

Average time on 1,000 it:
P4 1.6a@2.24 (16X140)=260.483
P4 2.0a@2.3 (20X115)=246.706
P4 2.26b@2.6 (17X153)=223.251
P4 2.0a (20X100)=294.332
P4 1.8a@2.52 (18X140)=234.151
Regards from Italy.
Guido
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Old 2002-08-22, 23:22   #11
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Default Re: 4096 P4 help wanted

[quote="Tasuke"]I am going to be running a 77.9 M ...quote]
Hi! My faster P4 should take less than 195 days for testing M77,900,000 wich is not much more than 150 days needed by my "old" TBird 0.9 Ghz for a 10mio digits exp. some time ago. So I'd like to test such a monster number as well...
How to ask Primenet for exponents like these? Thanks and regards from Italy.
Guido
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