Multi-Threaded Super-Pi Contest

poke349 · 11-20-2009, 09:21 PM

Quote:

Originally Posted by 87dtna

LOL, no biggie. I'm still third place in the 256m and second place in the 512m. I'm sure some I7's and some high clocked C2Q's will put me down LOL. I'm hoping to improve my scores some once I install my new motherboard and TRUE cpu cooler to try to hit 4.0ghz stable. Even 3.9ghz gets toasty with the GeminII cooler, about 68c.

Any decent dual-socket board will also do...

But it wouldn't be fair if I joined in. (since I know all the tweaks)

*I'll be glad to share them though.

And if anyone can beat the times here:

http://www.numberworld.org/y-cruncher/#FastestTimes

Lemme know, I'll be glad to update it as a new world record.

The times I use there are the "computation times", not the "total time including writing digits".
I do it this way because it throws out the effect of disk speed. (since it's a CPU/ram benchmark)

G25r8cer · 11-21-2009, 07:57 PM

Srry but could you change my stats again?

Im running a "Phenom II 955be"

Not be picky or anything but, I dont want to give other people a different impression/thoughts

THERMAL-REACTOR · 11-21-2009, 09:13 PM

Quote:

Originally Posted by poke349

Any decent dual-socket board will also do...

But it wouldn't be fair if I joined in. (since I know all the tweaks)

*I'll be glad to share them though.

And if anyone can beat the times here:

http://www.numberworld.org/y-cruncher/#FastestTimes

Lemme know, I'll be glad to update it as a new world record.

The times I use there are the "computation times", not the "total time including writing digits".
I do it this way because it throws out the effect of disk speed. (since it's a CPU/ram benchmark)

Here's some new runs, earlier I was only running my ram at 1333 but now these runs are with the ram at 1790.

2m- .598
http://i554.photobucket.com/albums/j...0/new2m598.jpg

4m- 1.193
http://i554.photobucket.com/albums/j...000/4m1193.jpg

8m- 2.352
http://i554.photobucket.com/albums/j...000/8m2352.jpg

16m- 4.611
http://i554.photobucket.com/albums/j...00/16m4611.jpg

32m- 9.472
http://i554.photobucket.com/albums/j...new32m9472.jpg

64m- 20.425
http://i554.photobucket.com/albums/j...0/64m20425.jpg

128m- 45.596
http://i554.photobucket.com/albums/j...000/128m-1.jpg

Btw Poke you wouldn't have any tips to give would you?

poke349 · 11-21-2009, 10:13 PM

Quote:

Originally Posted by THERMAL-REACTOR

Here's some new runs, earlier I was only running my ram at 1333 but now these runs are with the ram at 1790.

2m- .598
http://i554.photobucket.com/albums/j...0/new2m598.jpg

4m- 1.193
http://i554.photobucket.com/albums/j...000/4m1193.jpg

8m- 2.352
http://i554.photobucket.com/albums/j...000/8m2352.jpg

16m- 4.611
http://i554.photobucket.com/albums/j...00/16m4611.jpg

32m- 9.472
http://i554.photobucket.com/albums/j...new32m9472.jpg

64m- 20.425
http://i554.photobucket.com/albums/j...0/64m20425.jpg

128m- 45.596
http://i554.photobucket.com/albums/j...000/128m-1.jpg

Btw Poke you wouldn't have any tips to give would you?

Nice results!!! I'll update them later today.

Hmm tweaks...

Hardware/Software Tweaking:

For anything less than 15 million or so... disable HT.
On Core 2, get your FSB as high as possible, period. This program needs a LOT of bandwidth. (2x Xeon X5482 @ 3.2 GHz + 64GB DDR2 @ 800 MHz 1600 FSB is faster than 2x Xeon X5470 @ 3.33 GHz + 128GB DDR2 @ 667 Mhz 1333 FSB for computations over 50m.)*
Once your memory speed reaches a certain point (Core i7), it doesn't help much to go any higher. In that case, try lower frequency and tighter timings.
The program is quite sensitive to uncore frequency.
Windows Server HPC gives you control over a ton of thread and scheduling-related stuff. These can give a huge speedup on small computations where the programs spends a lot of time creating and destroying threads. (I think some of the other versions Windows may have it too.)
Try multiple runs. The smaller the computation, the more inconsistent the timings are (due to threading).
For this thread, write the digits to a ram disk. Since the times used for this thread include that final write to the disk which is disk-limiting.
For Core i7, keep your temps below 80C. That's about the point where turbo gets throttled. For my machine, for large computations (> 250m), 4.3 GHz runs slower than 4.2 GHz because 4.3 is just enough to push temps past 80C - which disables turbo and lowers the clock to 4.1 GHz.
For Core i7, use Windows 7 (or Server 2008). It knows how to deal with HT better than all previous versions of Windows.

*Sorry, I don't have any less extreme examples.
The only Core 2-based system I have is the dual X5482s with 64GB of ram. (in my sig)
The closest matching system I found benchmarks for is dual X5470s with 128GB of ram. (credit to Shigeru Kondo from Japan)

Program Tweaking:

Minimize the window.
Use the batch mode. It lets you loop benchmarks. It's complete with validation so results are just as valid as benchmark mode.
Batch mode gives you full control over the # of threads to run. This lets you override what the programs chooses. Sometimes it might be worth running more threads than cores. And for the really small runs, decreasing threads may help.
Try a different binary. The program chooses what it "thinks" is the fastest for your machine. But this isn't always true. For example: The "x64 SSE4.1 ~ Nagisa" binary runs faster than the "x64 SSE4.1 ~ Ushio" binary for anything less than ~16 million digits on Core i7.
Should memory be a tight squeeze, run the program a few times and kill it a few seconds after it sustains 100% cpu. This will force the OS to page out enough stuff to avoid thrashing. (This is crucial to getting 2.5b to run efficiently with 12GB of ram.)

THERMAL-REACTOR · 11-21-2009, 11:02 PM

Thanks man for all the information, I really wasn't expecting that. I am going to play around with the uncore frequency as well as my ram some more. I am trying to find a sweet spot with the timing and speed but my ram is limiting me. I really need to get some Corsair 2000 mhz stuff. I noticed that the top 1m was using a different binary and the best so far with the ushio for me is like .295 so I will also try re running all my sub 16m with the other binary.

G25r8cer · 11-22-2009, 05:56 AM

Got one for the 256m standings

High temp of only 42c

Jet · 11-22-2009, 07:10 PM

Hey all!

I updated the scores to not include the time to write to disk to mesh better with the official WR records that do not include that. The only change in placement is between bigrich0086 and 87dtna--87dtna got dropped to 5th in the 32M.

poke349 · 11-22-2009, 08:54 PM

Quote:

Originally Posted by Jet

Hey all!

I updated the scores to not include the time to write to disk to mesh better with the official WR records that do not include that. The only change in placement is between bigrich0086 and 87dtna--87dtna got dropped to 5th in the 32M.

Updated the WR list.

Sorry it took a while... was almost up the whole night in a Lan Party...

Also, the frequency that the program gives is almost always wrong when the multiplier isn't stock. (So it also won't detect turbo boost increases.)
So CPUz screenshots will be helpful.

It's very hard to detect the right frequency... hence why CPUz exists. But I keep it there to aid with validations.

Alex

G25r8cer · 11-23-2009, 01:23 AM

Dont forget my 256m run

Intel_man · 11-23-2009, 02:33 AM

32M

256M

512M

Keep in mind, this is Core i5 750 at stock 2.66GHz speed.

11-21-2009, 07:57 PM	#82 (permalink)
G25r8cer Diamond Member Join Date: Feb 2008 Location: Zeeland, MI Age: 19 Posts: 5,756	Srry but could you change my stats again? Im running a "Phenom II 955be" Not be picky or anything but, I dont want to give other people a different impression/thoughts __________________ Antec 300 w/Scyth Kaze Master Asus M4A785TD-V EVO Phenom II 955BE w/ CoolerMaster V8 @ 3.8GHZ 2 x 2gb Gskill DDR3 1600mhz Ultra X-Finity 600watt psu Samsung F3 500gb and F1 750gb XFX 9600GSO Logitech Illuminated, MX Revo, and x-540 speakers Team Stats FOLDING FOR THE GOOD OF MANKIND F@H Team 44358

11-21-2009, 11:02 PM	#85 (permalink)
THERMAL-REACTOR Platinum Member Join Date: Jan 2009 Location: Niagara Falls, Canada Posts: 757	Thanks man for all the information, I really wasn't expecting that. I am going to play around with the uncore frequency as well as my ram some more. I am trying to find a sweet spot with the timing and speed but my ram is limiting me. I really need to get some Corsair 2000 mhz stuff. I noticed that the top 1m was using a different binary and the best so far with the ushio for me is like .295 so I will also try re running all my sub 16m with the other binary. __________________ Intel Core i7 920 @ 4.2GHZ Asus P6T Deluxe 12Gb Patriot Viper DDR3 1600 Radeon HD4870X2 4 WD RE2 500GB Corsair HX1000W Samsung 46" 1080P LCD PIC'S : THERMAL-REACTOR

11-22-2009, 05:56 AM	#86 (permalink)
G25r8cer Diamond Member Join Date: Feb 2008 Location: Zeeland, MI Age: 19 Posts: 5,756	Got one for the 256m standings High temp of only 42c __________________ Antec 300 w/Scyth Kaze Master Asus M4A785TD-V EVO Phenom II 955BE w/ CoolerMaster V8 @ 3.8GHZ 2 x 2gb Gskill DDR3 1600mhz Ultra X-Finity 600watt psu Samsung F3 500gb and F1 750gb XFX 9600GSO Logitech Illuminated, MX Revo, and x-540 speakers Team Stats FOLDING FOR THE GOOD OF MANKIND F@H Team 44358

11-22-2009, 07:10 PM	#87 (permalink)
Jet VIP Member Join Date: Oct 2005 Posts: 5,996	Hey all! I updated the scores to not include the time to write to disk to mesh better with the official WR records that do not include that. The only change in placement is between bigrich0086 and 87dtna--87dtna got dropped to 5th in the 32M. __________________ Georgia Institute of Technology 2013 Mechanical Engineering

11-23-2009, 01:23 AM	#89 (permalink)
G25r8cer Diamond Member Join Date: Feb 2008 Location: Zeeland, MI Age: 19 Posts: 5,756	Dont forget my 256m run __________________ Antec 300 w/Scyth Kaze Master Asus M4A785TD-V EVO Phenom II 955BE w/ CoolerMaster V8 @ 3.8GHZ 2 x 2gb Gskill DDR3 1600mhz Ultra X-Finity 600watt psu Samsung F3 500gb and F1 750gb XFX 9600GSO Logitech Illuminated, MX Revo, and x-540 speakers Team Stats FOLDING FOR THE GOOD OF MANKIND F@H Team 44358

11-23-2009, 02:33 AM	#90 (permalink)
Intel_man Diamond Member Join Date: Feb 2008 Location: Vancouver, BC Posts: 1,872	32M 256M 512M Keep in mind, this is Core i5 750 at stock 2.66GHz speed. __________________ CPU:Intel Core i7 920 D0 @ 4.01GHz w/ Zalman CNPS9900A MOBO: eVGA X58 SLi E758-A1 PSU: Corsair HX650 VGA: Pallit GTX 260 Sonic 896MB x2 SLi HDD: Samsung Spinpoint F1 Series 500GB SATA RAM:Corsair XMS3 6GB DDR3-1600 CL 9-9-9-24 MONITOR: LG Flatron W2242TQ, NEC MultiSync LCD1530V NETWORK:D-Link DNS-323 - SeaGate Barracuda 500GB SATA2 OS: Windows 7 Pro 64 bit __________________

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