Nvidia GT640 takes 10,000 seconds to crunch 1 opencl_sah workunit

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The_Matrix
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Message 1803120 - Posted: 17 Jul 2016, 14:07:10 UTC
Last modified: 17 Jul 2016, 14:34:37 UTC

Hey folks, i am very surprised that my GT640 (4 to 5 times slower than my GTX 670)
is not only slow, but really super super slow on opencl_sah workunits.

Could someone explain this, i got no clue to make this thing faster
on this workunits.

On the gtx it takes about 1,000 seconds, thought it will take 5,000 seconds, but its about 10,000 !!! Won´t believe that.

OK SOLVED: GOT AN ERROR on this workunits, now it´s clear...truely NOT.

Wrong workunit, completed without error, but over 10,000 seconds to run...

Any guesses what happens there ?

Greets

Got only a gpu usage of 30 to 60 % of the nvidia GT 640, the GTX looking normal.
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Message 1803124 - Posted: 17 Jul 2016, 14:36:54 UTC

The GT 640 is a very slow card.
I bought one last year for testing purposes.

Without any app args no surprise at all.

You should at least use -sbs 256 in comand line.txt file.


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Message 1803125 - Posted: 17 Jul 2016, 14:38:14 UTC
Last modified: 17 Jul 2016, 14:56:58 UTC

oh, thanks for the reply, i will imedeatly config that,
perhaps it will do it.

edited , i will restart the client an watch it.

looks like stinking in a deep swamp, i´ll try this card in a diffent PCIe slot.

Can´t believe it crunches so badly...

1 to 2 % gpu usage, LOL , i think it died right before my eyes, i try another PC.
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Message 1803138 - Posted: 17 Jul 2016, 15:42:09 UTC
Last modified: 17 Jul 2016, 15:42:29 UTC

Full load on another pc, gremlins !?

So far, but i have to wait for opencl_sah workunits...

Even some utilities don´t work anymore on my main pc, like Kepler BIOS Editor and others.

Thought i did the right install on it (just 2 weeks old).
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Message 1803152 - Posted: 17 Jul 2016, 17:10:13 UTC - in response to Message 1803138.  

Hello The_Matrix,
From looking at Shaggi76e's incredible charts, we finally have something that allows us to classify GPUs as high-end, mid-range, and low-end.
If we split by cr/hr into 3 simple categories then we get:
1. high-end: >600 cr/hr; AMD Hawaii and above (on chart)
2. mid-range: 300-600 cr/hr; starting at GTX 750 Ti
3. low-end: <300 cr/hr; ending at GTX 750
Others might choose diff cutoffs.

All this to state: the GT640 is low-end (for me) in productivity when running stock apps with no commandline.

As for the GT640 and opencl_sah, that combo might be a bad one.
I hope this helps in putting things into perspective.
Cheers,
Rob ;-)
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Message 1803165 - Posted: 17 Jul 2016, 18:56:53 UTC - in response to Message 1803120.  

As usual posting links to results under question will help a lot.
Check stderr of that super-slow task - does it have "LowPerformancePAth" enabled?
What app's rev? Stock 8.12? If so it' known issue and will be fixed in next rev.
Also worth to check support thread for 8.12 app to get some impression what is known and how deal with that.
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Message 1803171 - Posted: 17 Jul 2016, 19:32:22 UTC
Last modified: 17 Jul 2016, 19:51:54 UTC

r k

http://setiathome.berkeley.edu/result.php?resultid=5046002781

LowPerformanceGPU path: yes

app 8.12

i am sorry when others don´t effect it, but i am also thinking SOON my mainboard will go down the river. Not yet but soon, as i see what happens all the time with my PCIe bus settings.

is that good for a kepler gpu ?: FERMI path used: yes
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Message 1803204 - Posted: 17 Jul 2016, 22:38:18 UTC - in response to Message 1803171.  



http://setiathome.berkeley.edu/result.php?resultid=5046002781

LowPerformanceGPU path: yes

For low-performance GPU path use_sleep enabled with 5ms per iteration


Try to upgrade to r3486 or add
-use_sleep_ex 1
to your current command line for 8.12.
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Message 1803208 - Posted: 17 Jul 2016, 23:04:53 UTC

Stick a fan on it and overclock it.
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Message 1803226 - Posted: 18 Jul 2016, 3:49:42 UTC
Last modified: 18 Jul 2016, 4:06:46 UTC

Changes have been made to SoG.txt file...

http://setiathome.berkeley.edu/result.php?resultid=5046974830

hab to stop this one.

can´t get SAH workunits, but got SoGs , and it must be the app whos responsible for these faults.

On Asteroids@home and cuda , no issues. Full load of the gpu.
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Message 1803227 - Posted: 18 Jul 2016, 3:51:28 UTC - in response to Message 1803208.  
Last modified: 18 Jul 2016, 3:51:47 UTC

Stick a fan on it and overclock it.


It´s aint a passiv cooled gpu, overlocking , sure i did +200Mhz on the gpu core. XD
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Message 1803258 - Posted: 18 Jul 2016, 8:35:38 UTC

Hi....for comparison this is my GT 640 nVidia with GDDR3 memory on board...

https://setiathome.berkeley.edu/result.php?resultid=5039798809

Marco.
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Message 1803259 - Posted: 18 Jul 2016, 8:43:41 UTC

700 gflops ? ok, then i must have bricked the cuda instructions somehow.

I flash another BIOS to the card.
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Message 1803263 - Posted: 18 Jul 2016, 10:15:20 UTC
Last modified: 18 Jul 2016, 10:18:14 UTC

don´t know what to say, BOINC client shows 692 gflops, board table says 104.4 gflops...

running 2 wus SoG at 70% gpu usage...
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Message 1803265 - Posted: 18 Jul 2016, 10:43:32 UTC

You have to free at least one core, preferably two to get more GPU usage.
I also have a GT 640 and it is running >95% usage with only one WU, same applies to AP-WUs.
Aloha, Uli

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Message 1803267 - Posted: 18 Jul 2016, 11:09:11 UTC
Last modified: 18 Jul 2016, 11:11:12 UTC

1.5 cores free, usage raised only 3 %. Think that was it, this card no more good for only some middleclass games now, but no more for cunching.

I build in my last AMD card.

Thanks all for ur advice and tips.
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Message 1803281 - Posted: 18 Jul 2016, 13:57:39 UTC - in response to Message 1803267.  
Last modified: 18 Jul 2016, 14:01:39 UTC

1.5 cores free, usage raised only 3 %. Think that was it, this card no more good for only some middleclass games now, but no more for cunching.

I build in my last AMD card.

Thanks all for ur advice and tips.

The 640 appears to be working nearly normal with the CUDA App. This result is around what you would expect from that card, https://setiathome.berkeley.edu/result.php?resultid=5046753244
Name: blc4_2bit_guppi_57451_68700_HIP117559_0021.20858.831.17.26.222.vlar_1
Run time: 1 hours 22 min 22 sec
CPU time: 3 min 32 sec

The problem with the Low End nVidia GPUs and the Current OpenCL Apps is a known problem. A newer Windows build helps those running Windows, but CUDA will probably still work better on the Low End GPUs such as the ones with only 2 Compute Units.
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Message 1803496 - Posted: 19 Jul 2016, 13:32:40 UTC - in response to Message 1803281.  

The 640 appears to be working nearly normal with the CUDA App.


ok, i am always bored ;) i´ll give it a try and install the GT640 + Lunarics and run only cuda 5.0 app.

We´ll see.
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Message 1803842 - Posted: 21 Jul 2016, 2:00:24 UTC

ok, results are NOT VALID. rip
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Message 1803879 - Posted: 21 Jul 2016, 6:45:52 UTC - in response to Message 1803227.  

It´s aint a passiv cooled gpu, overlocking , sure i did +200Mhz on the gpu core. XD

Well, then it's no wonder, the results are corrupted. That's way too much.
Aloha, Uli

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Message boards : Number crunching : Nvidia GT640 takes 10,000 seconds to crunch 1 opencl_sah workunit


 
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