[Haskell-cafe] Long running Haskell program

Bryan O'Sullivan bos at serpentine.com
Wed Nov 11 12:51:58 EST 2009

On Wed, Nov 11, 2009 at 7:43 AM, David Leimbach <leimy2k at gmail.com> wrote:

> I recently ran into some serious space leak difficulties that would
> ultimately cause this program to crash some time after startup (my simulator
> is also written in Haskell, and runs a LOT faster than the real application
> ever could, this has enabled me to fast forward a bit the data growth issues
> and crash in minutes instead of days!)

It sounds to me like you were storing a Map in a StateT. Since the usual
State and StateT monads don't force the evaluation of their payload, I'm not
terribly surprised that such a leak should arise.
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