2011/5/11 Stephen Bloch <[email protected]>: > So there are these things called "futures" and "places", of which I gather > the former are easier to use, but the latter, by being more constrained, take > better advantage of parallel hardware. I haven't tried working with either > of them yet, but I wanted to ask how feasible the following is. > > The "map-image" and "build-image" functions in the picturing-programs > collection both construct an image pixel by pixel, using a "for" loop of > which each iteration determines the color of a different pixel. It's a > perfect application for parallelism, as the iterations neither depend on one > another nor mutate the same memory location. If only there were a really > easy way to parallelize it... > > My ideal interface would be a "for/parallel" form that executes the "for" > body conceptually in parallel for each possible values of the loop variables. > Even friendlier would be for the existing "for" forms to do that > automatically until something order-dependent happens... but that seems very > difficult to detect. By using "for/parallel", I would be promising the > compiler that > (a) no iteration of the for-loop depends on results computed by any other > iteration of the for-loop, and > (b) different iterations of the for-loop either don't mutate any of the same > memory locations, or if they do, I don't care which one gets there first. > > > A related question: has anybody written a Racket interface to make use of > CUDA GPU's?
Yes: http://planet.racket-lang.org/display.ss?package=opencl.plt&owner=jaymccarthy > > > > > Stephen Bloch > [email protected] > > > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users > -- Jay McCarthy <[email protected]> Assistant Professor / Brigham Young University http://faculty.cs.byu.edu/~jay "The glory of God is Intelligence" - D&C 93 _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
