ghc releasing memory during compilation
simonmarhaskell at gmail.com
Mon Mar 13 09:02:04 EST 2006
Bulat Ziganshin wrote:
> SM> I think what you're suggesting is that the runtime should detect the
> SM> amount of physical memory on the system and auto-tune itself to switch
> SM> to compacting collection when its residency reaches that amount. This
> SM> is certainly something we could do. Bear in mind that GHC is not
> SM> necessarily the only process running on the machine, though, and what
> SM> about running multiple GHCs?
> i suggest checking of AVAILABLE physical ram, that is perfectly
> possible in windows
Ok, fair enough
> SM> Also, you can do this by setting your GHC_RTS environment variable.
> SM> Suppose you have 1G of physical mem. You want GHC to give up when it
> SM> reaches 1.5G, and you want to switch to compacting collection when the
> SM> residency reaches 300M. You could do this:
> SM> export GHC_RTS='-M1.5G -c20'
> SM> because 300M is 20% of 1.5G. Perhaps a better interface would be to
> SM> allow you to specify exactly the residency at which to switch to compaction.
> you mix up two questions:
> 1) switching from copying to compacting algorithm
> 2) return memory to OS after GC
No, I was just talking about (1). See my other replies in this thread
for comments about (2).
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