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 2010-04-23, 22:59 #144 odin   Apr 2010 33 Posts Also does MacLucasFFTW support a 3072K FFT length?
2010-04-24, 00:32   #145
odin

Apr 2010

338 Posts

Quote:
 Originally Posted by odin Also does MacLucasFFTW support a 3072K FFT length?
never mind. Oliver answered my question. Thanks.

Quote:
 Originally Posted by TheJudger Supported FFT sizes are 2M, 4M and 8M. A pessimistically guess: these FFT sizes should be able to process exponents up to 35M, 70M and 140M. Oliver

2010-04-24, 00:51   #146
msft

Jul 2009
Tokyo

2·5·61 Posts

Quote:
 Originally Posted by odin The specs are: Intel I5 750 2.66Ghz overclocked to 3.6Ghz 2GB 1333Mhz DDR3 RAM GIGABYTE GA-H55M-S2H
My PC specs:
Quote:
 INTEL Q8400 2.66GHz INTEL GD41RQ LGA775 GIGABYTE GTX260 GV-N26OC-896I (PCIExp 896MB)
Quote:
 Originally Posted by odin If MacLucasFFTW can run on the GPU and use only 5% on the CPU then I would like to purchase something like a GTX 295 which is a Dual GPU card and run two instances of MacLucasFFTW on one CPU core and have each instance run on one GPU.
On my PC:
Quote:
 MacLucasFFTW 2% CPU mprime(LL Double check) 99% CPU * 4
Quote:
 Originally Posted by odin What I really want to know is how can I run MacLucasFFTW and give it an exponent to first time LL test which I can manually assign myself from the mprime website?
Quote:
 Originally Posted by odin Does this program support something like the worktodo.txt file in mprime to assign an exponent to test?
Quote:
 $./MacLucasFFTW 216091 Iteration 10000 M( 216091 )C, 0x30247786758b8792, n = 2097152, MacLucasFFTW v8.1 Ballester or$ cat p 216091 756839 859433 $./MacLucasFFTW p Iteration 10000 M( 216091 )C, 0x30247786758b8792, n = 2097152, MacLucasFFTW v8.1 Ballester ... Quote:  Originally Posted by odin How do I make MacLucasFFTW create checkpoint file regularly like mprime in case my system restarts due to power loss? When get kill signal,MacLucasFFTW create checkpoint file. Quote: $ ls MacLucasFFTW $./MacLucasFFTW 216091 & [2] 30142$ Iteration 10000 M( 216091 )C, 0x30247786758b8792, n = 2097152, MacLucasFFTW v8.1 Ballester kill 30142 $[2]+ Done ./MacLucasFFTW 216091$ ls c216091 MacLucasFFTW $./MacLucasFFTW c216091 caso 2 Iteration 20000 M( 216091 )C, 0x13e968bf40fda4d7, n = 2097152, MacLucasFFTW v8.1 Ballester ... And -cN option Create a new checkpoint after every N iterations. Quote: $ ls MacLucasFFTW $./MacLucasFFTW -c1000 216091 & [2] 30158$ Iteration 10000 M( 216091 )C, 0x30247786758b8792, n = 2097152, MacLucasFFTW v8.1 Ballester $ls c216091 MacLucasFFTW t216091 Quote:  Originally Posted by odin If MacLucasFFTW finds a prime what would the result look like? Would it place the result in a text file so I could upload it to the mprime website? Quote:  t$ tail mersarch.txt M( 44497 )P, n = 131072, MacLucasFFTW v8.1 Ballester M( 44495 )C, 0xd9e1a6c23716e0fb, n = 131072, MacLucasFFTW v8.1 Ballester M( 756839 )P, n = 131072, MacLucasFFTW v8.1 Ballester M( 859433 )P, n = 131072, MacLucasFFTW v8.1 Ballester
Quote:
 Originally Posted by odin Have you guys, msft and frmky, checked the power usage of your system? How many watts is it pulling now?
What can i say...
Quote:
 Originally Posted by odin Does MacLucasFFTW support SLI?
SLI no effect for CUDA.

2010-04-24, 01:14   #147
frmky

Jul 2003
So Cal

2·3·347 Posts

Quote:
 Originally Posted by odin Have you guys, msft and frmky, checked the power usage of your system? How many watts is it pulling now?
Expect a GTX 295 to add about 450 Watts to your system. You need a minimum 700W power supply.

Our S1070, which is a separate 1U box containing 4 Tesla C1060 cards, uses about 900 W under load according to the UPS it's on.

2010-04-24, 09:30   #148
lavalamp

Oct 2007
Manchester, UK

17·79 Posts

Quote:
I'm pretty certain that to get the seal of approval from PCI-SIG, no card is allowed to be sold that will draw more than 300 W at stock settings. That's not to say a card can't be overclocked to draw more than that, but it'll almost certainly void any warranty.

Additionally, a PCIe card is allowed to draw 75 W from the slot, 75 W from a 6 pin PCIe power connector, and 150 W from an 8 pin PCIe power connector. Essentially what this means is that a 6 pin and an 8 pin connector is all you need, any more is out of spec anyway. That is why almost all high power cards have a 6 pin and 8 pin connector, just like the GTX 295.

However, there are enthusiast cards with two 8 pin PCIe power connectors, they are rare, but available, and are only sold because they expect people to madly overclock them.

Perhaps the most extreme of all is this card with two 8 pin and one 6 pin PCIe power connectors, allowing it to draw up to 450 W:
http://nexus404.com/Blog/2010/03/02/...sapphire-card/

Anyway, my point is, you shot too high, the GTX-295 draws about 290 W under full load. With odins spec, I'd say the minimum PSU size should be around 550 W to be able to cope when the whole system is under full load. However, the sweet spot for PSU efficiency seems to be about 50% loading, so I'd recommend an 800 - 1000 W PSU. But if odins current PSU is at least 550 W, I wouldn't worry about it too much.

2010-04-24, 20:29   #149
frmky

Jul 2003
So Cal

40428 Posts

Quote:
 Originally Posted by lavalamp Anyway, my point is, you shot too high,
You're right. It is spec'd at just below 300W. Interestingly, the S1070 is spec'd at 700W, but our UPS claims higher under load. Perhaps the UPS lies.

 2010-04-24, 20:53 #150 lavalamp     Oct 2007 Manchester, UK 17·79 Posts Perhaps it does not take into account the losses in the PSU?
 2010-04-24, 23:40 #151 lfm     Jul 2006 Calgary 1101010012 Posts The "start up" load on power supplies is usually the determining factor. The normal running load even under maximum processing load is less so your meter or UPS measure isn't too useful to determine the size of power supply needed.
 2010-04-25, 04:17 #152 odin   Apr 2010 110112 Posts Hi all, thanks for the replies. I asked because I saw this article on TomsHardware: http://www.tomshardware.com/reviews/...0,2585-15.html They measured the power at the plug, I think using a Kill-a-Watt device which I have. So this power draw includes the MB, CPU and RAM. 487W for GTX 295 under full load! Frmky power reading is probably correct. I'm thinking about what this is going to do to my electric bill if I run this 24/7! Thanks for the info.
2010-04-25, 10:42   #153
lfm

Jul 2006
Calgary

52·17 Posts

Quote:
 Originally Posted by odin Hi all, thanks for the replies. I asked because I saw this article on TomsHardware: http://www.tomshardware.com/reviews/...0,2585-15.html They measured the power at the plug, I think using a Kill-a-Watt device which I have. So this power draw includes the MB, CPU and RAM. 487W for GTX 295 under full load! Frmky power reading is probably correct. I'm thinking about what this is going to do to my electric bill if I run this 24/7! Thanks for the info.

Something like running slightly less than 5 100watt light bulbs 24/7 We don't know what rate you pay for power so we can't give you an exact answer.

For example if your rate is $0.10 per KWH then you'd pay 24*0.487*0.10 dollars per day. It works out to about$1.17 per day. Substitute your rate from your power bill for the \$0.10.

2010-04-30, 01:26   #154
msft

Jul 2009
Tokyo

2×5×61 Posts

Hi,
Version "N" at .0106 sec/iter for the 2048K FFT , .0218 sec/iter for the 4096K FFT and .0439 sec/iter for the 8192K FFT on GTX260.
Attached Files
 MacLucasFFTW.cuda.N.tar.gz (40.9 KB, 92 views)

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