Hello, On Wed, Nov 18, 2009 at 02:21:54PM +0000, Simon Marlow wrote:
[...] is now @a -> a@. This change helps to fix the space leak described in \"Runtime Support for Multicore Haskell\". The problem is that the runtime will currently retain the memory referenced by all sparks, until they are evaluated. Hence, we must arrange to evaluate all the sparks eventually, just in case they aren't evaluated in parallel, so that they don't cause a space leak. This [...]
I tried to understand the implications of this, read the relevant sections in the paper, and put together a little piece of code:
sparkN 0 f = f sparkN !n f = (n + 42) `par` sparkN (n-1) f
main = sparkN 100000000 $ do performGC getLine
I compiled that with GHC 6.10.4 and expected to get a huge space leak, which didn't happen. What am I doing wrong? Thanks in advance for any tips. Regards, -- Tomáš Janoušek, a.k.a. Liskni_si, http://work.lisk.in/