On Fri 29 Mar 2013 06:49, Mark H Weaver <m...@netris.org> writes: >> scheme@(guile-user)> ,time (define a (map (lambda (x) (expt x 5)) (iota >> 10000))) >> ;; 0.008019s real time, 0.007979s run time. 0.000000s spent in GC. >> scheme@(guile-user)> ,time (define a (par-map (lambda (x) (expt x 5)) >> (iota 10000))) >> ;; 6.596471s real time, 6.579375s run time. 1.513880s spent in GC. > > The timings above suggest that, on your machine, the overhead of > 'par-map' is in the neighborhood of 660 microseconds per thread (that's > the total run time divided by 10000 iterations).
Per item, you mean? Anyway this seems like a really high overhead, and we shouldn't make too many excuses for it ;) Andy -- http://wingolog.org/
