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fancyIX / sgminer-phi2-branch

A branch of sgminer optimized with GCN cross lane instructions on AMD (ethash, phi2, lyra2Z[z], allium, x25x, lyra2REv2/v3, argon2d, yescrypt, neoscrypt, 0x10)
GNU General Public License v3.0
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x22i keccak #106

Closed KL0nLutiy closed 5 years ago

KL0nLutiy commented 5 years ago

There is 2 known patterns that used for keccak kernel. The old one that is used in x22i now and newer one that was implemented by wolf I think. The second one used by avermore in x16r algo: https://github.com/brian112358/avermore-miner/blob/43e36dff5c21ad1ba98ef4b0efa07592780028d8/kernel/x16.cl#L993 This pattern is used by lycl miner: https://github.com/CryptoGraphics/lyclMiner/blob/master/kernels/keccakF1600/keccakF1600.cl And also it used by Ethash kernel: https://github.com/ethereum-mining/ethminer/blob/16e214428ddfc0954df10ba3a728149d68409606/libethash-cl/kernels/cl/ethash.cl#L87

I did a benchmark of this 2 patterns and the old one seems to be faster, but not sure why. Maybe this info will be useful for further x22i performance improvements.

fancyIX commented 5 years ago

@KL0nLutiy , did you run CodeXL on them? Which one has less vgpr usage and more occupancy? Anyone has vgpr spill. Any LDS banck conflicts?

fancyIX commented 5 years ago

Won't fix