On 09/15/2010 09:59 PM, D. J. Bernstein wrote: > Thomas Pornin writes: >> So the G3 from a decade ago does about 2.5x more things per cycle than >> the PowerPC core in the Cell processor. I find this decidedly fishy. > > Welcome to reality! Actually, the PPU on the Cell is capable of more > 32-bit operations per cycle than the G3, _if_ you use it sensibly. (It > also has two threads, and of course a much higher clock speed.) You > might find the manual helpful: > > > https://www.ibm.com/chips/techlib/techlib.nsf/techdocs/7A77CCDF14FE70D5852575CA0074E8ED?Open >
Hi, If I may add my two cents, I'd also advise you to look at the AltiVec extension. It makes the performance of the PPU a bit less ridiculous. Nicolas. > Appendix A explains the performance of the PPU. Appendix B explains the > performance of the 6 (or 7 or 8) SPUs---I understand that you aren't > asking about the SPUs, but nobody would buy a Cell without the SPUs; the > PPU by itself is rather mediocre as a CPU. > > ---D. J. Bernstein > Research Professor, Computer Science, University of Illinois at Chicago > > _______________________________________________ > Gcc-cfarm-users mailing list > Gcc-cfarm-users@gna.org > https://mail.gna.org/listinfo/gcc-cfarm-users > -- Nicolas BENOIT http://megadictators.net _______________________________________________ Gcc-cfarm-users mailing list Gcc-cfarm-users@gna.org https://mail.gna.org/listinfo/gcc-cfarm-users
