Hello everyone,

I'm looking for suggestions on how to increase acceptance rate and effective hash rate for myriad-groestl mining with ccminer.

I have a mining rig with 3 older AMD cards and 2 new GTX 1070s. According to ccminer, the 2 1070s are hashing myriad-groestl at 162.x Mh/s which is 140% of the 115.x hashrate of the 3 AMD cards as reported by sph-sgminer-x11mod running with an updated myriad-groestl kernel.

The pool reports that both miners are mining at the same difficulty in the following screenshot, so I would expect to see the 1070s getting somewhere around 140% of the shares of the AMD cards. I'd also expect to see the effective Hashrate reported by the pool for the cuda worker to be closer to 160, I've never seen it go above 60.


Actually, the 1070s are getting less than half of the accepted shares of the amd cards. Here's a screenshot of both miners, started at the same time, after a 14h:42m run:


I've tried ccminer 2.0 x86, x64, 2.1-tribus, and 811. All exhibit the problem of reporting a high hash rate but finding fewer shares than the slower AMD cards hashing at the same difficulty for the myriad-groestl algorithm.

What sort of tuning might be done to ccminer or the cards to increase the effective hashrate in the pool and/or increase the rate of share acceptance in the miner? Or, is this a problem with the pool?

I'm only seeing this problem with ccminer/myr-gr. When mining equihash with different mining software (EWBF), the 1070s are also hashing around 140% faster than the AMD cards, and the effective hashrate in the pool and the number of accepted shares reflect the higher hash rate.