To avoid this in future, you can use the strict-concurrency package on hackage, which has some stricter container types, with their strategies. MVars and Chans are the main examples of where a stricter strategy is sometimes useful.
kolar: > Yes, that's is. Thanks. My fault - missing wood seeing trees. ;-) > > Best regards, > > Dusan > > Roberto Zunino wrote: > >Dusan Kolar wrote: > >>Dear all, > >> > >> I've thought the following three (dummy) programs would run some of > >>their parts in parallel (on dual core) if compiled with option > >>threaded (smp). The truth is that only the first one exploits > >>multicore CPU. Why? > > > >> h1 <- forkIO $ putMVar v1 $ fibs (n-1) > > > >You are putting an unevaluated thunk in the MVar. Try: > > > >h1 <- forkIO (putMVar v1 $! fibs (n-1)) > > > >Zun. > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
