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[Official] BitCoin LiteCoin DigitalCoin and all Crypto Currencies Club And General Information Thread - Page 87

post #861 of 22534
Thread Starter 
Increase thread concurrency, and play with queue, scan time and expiry values if you get hw. Also, what's your look-up gap value at?

What coin are you mining? Gpu instability normally crashes the rig, hw are a config problem, not clock related. (In general)
post #862 of 22534
cgminer.exe --scrypt -o stratum+tcp://stratum.give-me-ltc.com:3334 -u bluestang.1 -p x -w 256 -v 1 -I 19 -g 1 -s 30 --lookup-gap 2 --thread-concurrency 8000
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post #863 of 22534
Thread Starter 
For intensity 19 you need 24000 for thread concurrency...min 21712.
post #864 of 22534
Quote:
Originally Posted by ivanlabrie View Post

For intensity 19 you need 24000 for thread concurrency...min 21712.

Can you explain what exactly thread concurrency is?

Using GUIMiner and an intensity of 19, my 7950 @1030/1600 has a hash rate of 605 kHash/s. Does that sound about right?
post #865 of 22534
Thread Starter 
What thread concurrency value?

I can't explain exactly what it is tongue.gif
I know for a fact that it's tied to intensity, and if you want to use higher intensity you need to increase TC, otherwise you'll get HW.

The cgminer scrypt readme explains it in more detail.
post #866 of 22534
directly from the CGMiner scrypt-readme
Quote:
--thread-concurrency:
This tunes the optimal size of work that scrypt can do. It is internally tuned by cgminer to be the highest reasonable multiple of shaders that it can allocate on your GPU. Ideally it should be a multiple of your shader count. vliw5 architecture (R5XXX) would be best at 5x shaders, while VLIW4 (R6xxx and R7xxx) are best at 4x. Setting thread concurrency overrides anything you put into --shaders and is ultimately a BETTER way to tune performance.

SUMMARY: Spend lots of time finding the highest value that your device likes and increases hashrate.

it is only used on scrypt-based coins

the README is one of the most helpful I've seen in a long time, definitely a MUST read
post #867 of 22534
seriously though bluestang, thanks again for that suggestion
so far soo good (Click to show)
post #868 of 22534
Quote:
Originally Posted by ivanlabrie View Post

For intensity 19 you need 24000 for thread concurrency...min 21712.

Nope, can't do anything over 8192 on this 7850 w/o cgminer erroring and telling me to either decrease TC or LG. At least I've only gotten 1 HW in the past couple hours with 8192....Sucks though as I only get ~380 kh/s compared to ~415 kh/s with 8000.
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post #869 of 22534
Quote:
Originally Posted by bluestang View Post

Nope, can't do anything over 8192 on this 7850 w/o cgminer erroring and telling me to either decrease TC or LG. At least I've only gotten 1 HW in the past couple hours with 8192....Sucks though as I only get ~380 kh/s compared to ~415 kh/s with 8000.

you can delete the .bin files that it creates inside the cgminer folder, then set your TC to 0 in the config. Cgminer will then try to find the best TC for your card. Thats how i have my 7950's setup and i'm pulling 650+ on all 4. I also use that setting with a 6970 in another machine without any issues.. I did have a small issue with the Intensity, but after making sure i had the latest version of cgminer all my issues went away
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post #870 of 22534
So, out of curiosity, why is it that Nvidia cards fail so hard at mining? I read before that it was because Nvidia uses fewer, but more complex shaders which were inefficient for hashing. And that was true with Fermi. But with Kepler, the GK110 cards have even more shaders than anything in the AMD line up and yet the Titan hashes like a 7790...

So what's the deal? Why can't CUDA be leveraged for mining? headscratch.gif
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