From: C K Kashyap
Hi, I tried the first example from "A tutorial on Parallel and Concurrent programming in Haskell" but I cant seem to get sparks to get converted to OS threads.
Below is the program I am using. I did ghc --make -threaded program.hs then ./program +RTS -N2 I don't see any speed gain compared to N1. Am I missing something?
If you are using ghc 7.01, you need to compile with -rtsopts for the compiled program to parse +RTS options. I don't know of any way to provide a default value at compile time. http://www.haskell.org/ghc/docs/7.0-latest/html/users_guide/runtime-control.... Also, in general a program might not run faster with speculation, so if you want to check if several threads are used, check if CPU time used is over 100%. Brandon