[jhc] What are these garbage-collectors?
john at repetae.net
Mon Dec 20 20:35:37 CET 2010
The boehm collector is a pure C garbage collector which can be linked
into the output of jhc, it can be found here
(http://www.hpl.hp.com/personal/Hans_Boehm/gc/) but many distrubtions
contain it pre-packaged. It is the GC used
by many language implementations, such as the gnu java implementation.
Although it works, it is not well optimized for haskell and is quite
was mainly used as a debugging tool by me and as an option to get
things to work that just wouldn't otherwise. the "jgc" gc is a native
implemented by jhc and will be the standard one going forward. It is
not enabled by default yet as there are a couple cases it can't handle
(collecting ForeignPtrs and very large arrays) but I am working on
On Mon, Dec 20, 2010 at 1:55 AM, Robert Clausecker <fuzxxl at gmail.com> wrote:
> Hi guys!
> Since a while I'm playing around with JHC and wanted to ask something
> about the garbage collector(s). First, what is this "Boehm" thing? Is it
> some other garbage collector written by somebody else? I can't run it on
> my machine.
> The other thing: When I compile this* program with GC enabled, the
> output is random crap or it segfaults. What happens here? I should dig
> into it deeper. Possibly someone can give my some adivise, I guess it's
> mostly a matter of the arrays or something else.
> Yours, Robert Clausecker
> *: The program is available here: https://github.com/fuzxxl/BWInf in the
> folder Aufgabe4.
> Make shure to checkout the "performance" branch. I changed some stuff to
> make it compile with JHC, and reverted it afterwards. Sorry, as this was
> pure homework for some competition, I coded in German. I can try to
> translate it, but maybe it's understandable as is. The program
> calculates the expected result of some game or may play for n times.
> Given no parameters, it will analyze, with "-n -c ###" it will play n
> games. On GHC, it will run in constant space and 1000000 games are done
> in about 6 seconds. JHC is much worse.
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