Quote from: nwoolls on December 13, 2013, 11:51:08 PM

Okay folks, I'm calling out atomicchaos, skyhigh2004, and techstorm2 specifically. Please get in touch with me if you get better scrypt performance with cgminer than you do with bfgminer so I can investigate. I'm going to be digging into the scrypt code in bfgminer and I need some sort of lead on the performance difference you guys are seeing.

Each time I've asked for more details on this I've been met with silence. I really would like to get this reproduced and fixed.

I'm sorry, I missed this message originally, as I wasn't checking the forums as much. The performance difference is bad, especially when multiplied by the number of rigs I have. I think my biggest issue is that Luke has already stated that he doesn't care about Scrypt, so it's going to turn out exactly like CGminer did I think. However, it appears that Luke at least works with you, where CK and crew were a bit difficult from what I'm reading into things.

Here are my arguments for CGminer on this sample rig with 4 x 7950s:

Code:

-s 1 --intensity 20 --gpu-engine 1020 --gpu-vddc 1100 --thread-concurrency 24000 --lookup-gap 2 --worksize 256 -g 1 --expiry 10 --queue 0 --auto-fan --failover-only

Output with CGMiner:
True   GPU   opencl   Litecoin   3231.18329466   .02937   1610%      74   641.5   4963   76   0   1.9223   20
True   GPU   opencl   Litecoin   3231.18329466   .02937   1610%      82   628.2   5001   82   0   1.9371   20
True   GPU   opencl   Litecoin   3231.18329466   .02937   1610%      90   628.5   4782   99   0   1.8522   20
True   GPU   opencl   Litecoin   3231.18329466   .02937   1610%      74   641.4   4961   79   0   1.9216   20

Output with BFGMiner:
True   OCL   opencl   Litecoin   3231.18329466   .02929969   1606%      73   616   23   0   0   2.441   20
True   OCL   opencl   Litecoin   3231.18329466   .02929969   1606%      81   590   19   0   0   2.016   20
True   OCL   opencl   Litecoin   3231.18329466   .02929969   1606%      88   592   26   0   0   2.759   20
True   OCL   opencl   Litecoin   3231.18329466   .02929969   1606%      74   621   25   0   0   2.653   20

Multiply this by 40+ rigs and I've got a significant loss in hashing power. Programatically, I can't offer any help, as I don't have that skill set, but I'd certainly love to test a solution, as I miss having the latest Multi-miner, really grew to love it.