Dear Allin and Jack, I'have observed some increased efficiency in the built-in multi-core support during the last few months. Just out of curiosity: has really anything changed in this direction or is it simply my subjective impression that the CPU usage has substantially increased running the same script on the same machine? For instance, on a modern i5 4-core machine almost 2 cores are automatically exploited for heavy-loop and heavy-matrix computations. On an older AMD 2-core machine the CPU usage is slightly lower but still the 2nd core is at least used up to 40% or so.

On Thu, 19 Feb 2015, Artur T. wrote: > Dear Allin and Jack, > > I'have observed some increased efficiency in the built-in multi-core > support during the last few months. Just out of curiosity: has really > anything changed in this direction or is it simply my subjective > impression that the CPU usage has substantially increased running the > same script on the same machine? > > For instance, on a modern i5 4-core machine almost 2 cores are > automatically exploited for heavy-loop and heavy-matrix computations. > On an older AMD 2-core machine the CPU usage is slightly lower but > still the 2nd core is at least used up to 40% or so. Have you been seeing a noticeable increaswe in performance? I'm asking because the benefits from parallelisation are in most cases far from being linear, and we ran extensive tests on what the best strategy was; often (matrix products, for example) we settled on compromise solutions that appeard to work "well" on the hw/sw combos we had at our disposal, but of course the more real-life cases we hear, the better we can gauge multicore usage.