Hello,
Reduce this to 1024, otherwise the runtime will eventually find itself dealing with file descriptors beyond the select() limit mentioned above. Someone with more knowledge of the Haskell runtime will have to advise as to possible ways around it if you really need more than 1024 file descriptors.
There's no easy workaround. We could have the IO library switch to using blocking read() calls for the out-of-range FDs to avoid the error from the IO manager, but that is likely to lead to a different problem: too many OS threads.
Thank you for reply. I changed forkIO to forkOS. But I received the following error. ERRORCannot create OS thread. I want to decrease the stack size of threads to increase the number of threads to be created. How can I do this? I tried to decrease ResourceStackSize and tried the RTS -k option but both does not increase the number of threads... --Kazu