CUDALucas (a.k.a. MaclucasFFTW/CUDA 2.3/CUFFTW) - Page 14

odin · 2010-04-23, 22:59

Also does MacLucasFFTW support a 3072K FFT length?

odin · 2010-04-24, 00:32

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

msft · 2010-04-24, 00:51

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?

login GIMPS website->Manual Testing->Assignments->Get Assignments

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

login GIMPS website->Manual Testing->Results->Submit

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.

frmky · 2010-04-24, 01:14

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.

lavalamp · 2010-04-24, 09:30

Quote:

Originally Posted by frmky

Expect a GTX 295 to add about 450 Watts to your system.

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.

frmky · 2010-04-24, 20:29

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.

lavalamp · 2010-04-24, 20:53

Perhaps it does not take into account the losses in the PSU?

lfm · 2010-04-24, 23:40

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.

odin · 2010-04-25, 04:17

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.

lfm · 2010-04-25, 10:42

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.

msft · 2010-04-30, 01:26

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.

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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, 20:53	#150
lavalamp Oct 2007 Manchester, UK 2×3×223 Posts	Perhaps it does not take into account the losses in the PSU?

2010-04-24, 23:40	#151
lfm Jul 2006 Calgary 5²·17 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 3³ 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.