OK
Hashrate comparisons alone are arbitrary. As Adam Back (hashcash inc=ventor and genius cryptographer) has pointed out:
2x hashrate > 2x difficulty = status quoThus the whole "energy efficiency" thing is therefore something of a fallacy!
To decide which algo wins we must study their individual characters.Groestl, as is used in Groestlcoin (the only Groestl PoW crypto), has such a unique characteristic. It shares a similar design to the AES S-Box and therefore its performance can be accelerated by AES implementations like AES-NI (Intel) and NEON (ARM). This helps to reduce the efficiency gap between CPU and GPU mining with Groestl. Groestl is the only algo with this S-box design.
To quote from an official Grøstl Team paper, see:
http://www.groestl.info/groestl-implementation-guide.pdf7 Conclusions
In this paper, we have shown the details of the currently best known Grøstl implementations. Using AES-NI extensions and AVX instructions, we are able to implement Grøstl-256 with close to 10 cycles/byte. Furthermore, the design of Grøstl also provides many possibilities for efficient implementation techniques. We have presented the most important methods and hope that they will serve as an inspiration for further optimizations. Especially the vperm implementation has some room for improvements, on x86 CPUs as well as on new platforms. For example, NEON byte permute instructions can be used to speed-up Grøstl on new ARM platforms
efficient implementation techniques?
inspiration for further optimizations?
improvements, on x86 CPUs as well as on new platforms?
NEON byte permute instructions can be used to speed-up Grøstl on new ARM platforms?
Just wait to u get to the bit about bit-slicing…
Dev cbuchner1 of cudaminer/ccminer fame will soon be releasing his "killer groestl" implementation (based om bit-slice i believe). It will offer 3x speed for 2x energy at a bare min and prob much more.
AMD opts in the works…
In short, Groestl performs well on all platforms and thus democratizes (decentralizes) mining.
Good performance on many platforms is the measure of a good PoW algo.Good performance on ARM could be revolutionary…
Ultimate PoW still waiting to be unleashed…
Check out Groestlcoin:
https://bitcointalk.org/index.php?topic=525926.0\Ø/