Bulat Ziganshin
Hello T,
Monday, November 3, 2008, 2:28:08 AM, you wrote:
What would it take to implement a -j equivalent for, say, GHC? Or if this is not possible, what is wrong with my reasoning?
problem is that make have rather large pices of work which it can run parallel. if ghc will try to parallel every machine operation, it will pend more time maintaining these jobs. 'par' is just the way to tell GHC "this part of job is large enough"
..and also that this piece of work will actually need to be evaluated. With lazyness, a program can have subexpressions that are bottom as long as they are not evaluated, any kind of speculative execution must take care to handle this properly. -k -- If I haven't seen further, it is by standing in the footprints of giants