pepe wrote:
On 27/03/2008, at 3:49, Ian Lynagh wrote:
On Wed, Mar 26, 2008 at 02:33:20PM -0700, Jim Snow wrote:
-Memory consumption is atrocious: 146 megs to render a scene that's a
33k ascii file. Where does it all go? A heap profile reports the max
heap size at a rather more reasonable 500k or so. (My architecture is
64 bit ubuntu on a dual-core amd.)
I haven't looked properly yet, but it looks like something is leaking
memory that shouldn't be. The attached Gloom.hs uses constant memory,
but if you replace the "map" with the commented out "(parMap rnf)" then
the memory use seems to keep increasing, even once it has run display
once and is running it a second or third time.
In my system the leak only appears with +RTS -N1 (which is the default).
If I use -N2 or higher, then your version runs in constant memory with
(parmap rnf).
Cheers
pepe
Using Ian Lynagh's Gloom.hs (I'm not sure if that's a typo, but it's a
convenient way to distinguish it
from my original Glome.hs):
With parMap and +RTS -N2, I get 59 megs total mapped memory, 18 megs
resident all three iterations.
With parMap and +RTS -N1, I get 53/21, then 99/66, then 145/112 megs
total/resident.
With map and no RTS options, memory use is 37/4.8 all three iterations.
I'm using ghc 6.8.2 on 64-bit ubuntu.
-jim
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