Here a rapid tests done on Power 8 Cloud (http://runabove.com, only 1$ per hour, so go test it !
) on 176 threads :CPUMiner, not optimised for P8
BTC/SHA256 :
below 20 threads,
88 threads => 62 MHashs/s
176 threads => 46 MHash/s
LTC/Scrypt :
below 20 threads, 2 Khash/s per thread
88 threads => 105 Khash/s
176 threads => 82.72 Khash/s
Not good... But I think that with a specificaly designed Miner, it could be awsome, but it will not be better than ASIC...
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Here all the command to do to run CPUMiner on Power8 from RA
[admin@test-p8 cpuminer-2.4]$ history
1 sudo yum install wget git bzip2 tar make diff gcc make automake libcurl-devel.ppc libcurl-devel.ppc64 libcurl.ppc libcurl.ppc64
2 wget http://sourceforge.net/projects/cpuminer/files/pooler-cpuminer-2.4.tar.gz
3 tar xzf pooler-cpuminer-*.tar.gz
4 cd cpuminer-2.4/
5 ./configure CFLAGS="-O3"
6 make
7 ./minerd --url=stratum+tcp://ltc.ghash.io:3333 --userpass=xxxx --threads=88 --algo scrypt
8 ./minerd --url=stratum+tcp://ltc.ghash.io:3333 --userpass=xxxx --threads=176 --algo scrypt
9 ./minerd --url=stratum+tcp://uk1.ghash.io:3333 --userpass=xxxx --threads=88 --algo sha256d
10 ./minerd --url=stratum+tcp://uk1.ghash.io:3333 --userpass=xxxx --threads=176 --algo sha256d
11 history
Do you want me to do some other test ?
Have a nice day,
Maiko