Allocation doesn't work very well in parallel. It is one of the few operations that doesn't work well in parallel and yet will still support a little because it is so hard to eliminate completely. But when the two futures are doing essentially only allocation, then you will see no parallel speedup.
If this is the essence of some larger program where the allocation doesn't actually need to be shared, you might try places. hth, Robby On Mon, Jul 18, 2011 at 10:04 AM, Stees, Micheal T. <mst...@monmouthcollege.edu> wrote: > I am trying to create a matrix like structure in parallel. It was my > intention to create each row of the matrix in parallel, and then simply > combine them together using a list or some other collection. My questions is > this, the following code will create the structure that I am looking for, but > it will not execute the creation of the two lists in parallel, am I doing > something wrong here? > > (define (buildRow row) > (build-list row (lambda (x) (random 10000000)))) > > (let ([f (future (lambda () (buildRow 5000)))]) > (list (buildRow 5000) > (touch f))) > > -Mike > > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users > _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
