ghc releasing memory during compilation

[Simon Marlow]

Ketil Malde wrote:
> Ketil Malde <ketil+haskell at ii.uib.no> writes:
> 
> 
>>  18580 ketil     18   0 1762m 945m  256 D  3.0 93.5  33:52.81 rbr
>>
>>So it used more than double the amount of memory.
> 
> 
> I can provide the source, but perhaps I should mention that the
> program basically just builds a large "Map Int Int".  No tricky FFI,
> arrays or anything, at least not explicitly in my code.

Is it reproducible?  I expect that the -M value might be exceeeded by a 
small amount sometimes, but double is surprising.

Please supply the source, it saves time trying to reproduce.

Cheers,
	Simon