Yay, that fixed it. Thanks! On Sun, Mar 18, 2012 at 2:50 PM, Aleksey Khudyakov <alexey.sklad...@gmail.com> wrote: > On 18.03.2012 22:32, Clark Gaebel wrote: >> >> Hey list. >> >> I was recently fixing a space leak by dropping down to imperative >> programming in a section of my code, when it started developing space >> leaks of its own. >> >> I found the problem though - it was my "for loop": http://hpaste.org/65514 >> >> Can anyone provide suggestions on why that stack overflows? It seems >> ridiculously tail recursive. I tried to do it more haskell-like with >> http://hpaste.org/65517, but it was still spending 75% of its time in >> GC. >> > Excessive laziness could be cleverly hiding. modifyIORef doesn't modify > IORef's value but builds huge chain of thunks. When you try to evaluate > it you get stack overflow. Forcing value of IORef will fix this space leak. > > You could use strict version of modifyIORef: > > modifyIORef' x f = do > a <- readIORef x > writeIORef x $! f a > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe >
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