[Haskell-cafe] GHC 7.0.1 developer challenges
marlowsd at gmail.com
Wed Dec 15 13:59:15 CET 2010
On 13/12/2010 15:45, Peter Simons wrote:
> Hi Mathieu,
> > Why don't you use ulimit for this job?
> > $ ulimit -m 32M; ./cpsa
> yes, I was thinking the same thing. Relying exclusively on GHC's ability to
> limit run-time memory consumption feels like an odd choice for this task.
> It's nice that this feature exists in GHC, but it's inherently non-portable
> and outside of the scope of the language. There really ought to be a better
> way to catch an infinite loop that this.
ulimit is a good way to catch an infinite loop. But it's not a good way
to tell GHC how much memory you want to use - if GHC knows the memory
limit, then it can make much more intelligent decisions about how to
manage memory. The -M flag causes the GC algorithm to switch from
copying (fast but hungry) to compaction (slow but frugal) as the limit
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