ghc needs memory

Edward Z. Yang ezyang at MIT.EDU
Sat Jan 28 01:46:46 CET 2012

Hello John,

When this has happened to me in the past, it was because I was trying to
allocate using a corrupted read (though, this was a userland).  So it's very
plausible you've hit a bug in GHC. Have you tried 7.2? HEAD?


Excerpts from John Meacham's message of Fri Jan 27 19:33:13 -0500 2012:
> So... I knew that ghc was a memory hog.. but I am suddenly running
> into it dying with messages like the following:
> ghc: out of memory (requested 5997056753664 bytes)
> make[1]: *** [jhc] Error 1
> Before I go out and find a machine with 6 terrabytes of RAM, I figured
> I'd post here first :)
> now the strange thing is, this started happening at the same time for
> both ghc 6.12.1 and 7.0.x (will report exact version  later) so
> clearly something about my code is tickling ghc the wrong way. Though,
> ghc 7.0.x is slightly better in that it requests only one and a half
> terrabytes of ram :)
> Hmm.. I will try to track down a smaller test case, or narrow down
> what change caused it, but everything looks quite benign. I did
> recently add NoMonomorphismRestriction, NoMonoLocalBinds, and
> OverloadedStrings to my standard options, which is the only global
> change across the board I can think of...
>    John

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