[Haskell-cafe] Threads with high CPU usage

Andrea Vezzosi sanzhiyan at gmail.com
Sun Dec 21 19:47:19 EST 2008

Tried running the program with +RTS -Nn where n = 2 or more? that should use
more OS threads

On Sun, Dec 21, 2008 at 10:43 PM, Günther Schmidt <redcom at fedoms.com> wrote:

> Hi,
> in an application of mine I start a long-running operation in a thread via
> forkIO so that the UI process doesn't get blocked.
> It just so happens, that the long-running process also takes the CPU to
> nearly 100% while it runs.
> During that time the run-time system does *not* switch back and forth
> between the UI-process and the long-running task, it seems that the UI
> process only gets woken up *after* the high CPU thread finishes completely.
> To the effect of course that it makes no difference at all to the UIs
> responsiveness whether I use forkIO or not.
> The long running process is pretty atomic, it's a single query to the
> database which takes up to a minute to complete so I don't see a chance to
> squeeze a "mainIteration" in there.
> What can I do?
> Günther
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