[R-sig-hpc] Why pure computation time in parallel is longer than the serial version?

[Ei-ji Nakama]

> maybe this performance of NEHALEM Core.
> and hyperthread decreases the efficiency of cache in the procession.

oops, PENRYN(SIMD) core used if you use 32bit ubuntu
development of 32bit stopped with PENRYN core.

Best Regards,
--
EI-JI Nakama  <nakama (a) ki.rim.or.jp>
"\u4e2d\u9593\u6804\u6cbb"  <nakama (a) ki.rim.or.jp>