[Haskell-cafe] Turn GC off

[Ovidiu Deac]

To me this sounds like a problem where Erlang might be a better choice.

On Wed, Sep 28, 2011 at 4:04 PM, Andreas Voellmy
<andreas.voellmy at gmail.com> wrote:
> On Sat, Sep 17, 2011 at 1:38 AM, Jesse Schalken <jesseschalken at gmail.com>
> wrote:
>>
>> There might be a way to do it, I don't know, but this sounds like an XY
>> problem. Can I ask what you're trying to achieve by doing this, or is it
>> just out of curiosity regarding how much garbage is created? (It's a lot, by
>> the way. Since the only thing a purely functional program can do is create
>> data and read data (as opposed to create, read and update in an impure
>> program) I imagine a purely functional program without GC would hit OOM
>> very, very quickly.)
>
> Sure. I'm writing a server that serves a number of long-lived TCP
> connections. The clients can be served mostly independently; there is a bit
> of shared state among the different connections. I'd like to use the
> concurrency available to scale the server to handle a large number of
> clients. Ideally I would just use more cores to handle a larger number of
> clients. It seems that GC is the biggest obstacle to doing this. The problem
> seems to be that the current GC stops all the processors before performing a
> GC. With a large number of processors this becomes expensive, and I find
> that a program that has really high mutator productivity with one processor
> can get terrible productivity at 12 or more processors. Of course, it helps
> to reduce the allocation rate of the program, but even after being very
> careful about how much memory is allocated, GC still takes up a significant
> amount of time. So I was looking for a way to turn off GC altogether just as
> an experiment to see how the program would perform without all the GC
> pauses.
> --Andreas
>
>
>>
>> On Thu, Sep 15, 2011 at 2:42 AM, Andreas Voellmy
>> <andreas.voellmy at gmail.com> wrote:
>> > Hi everyone,
>> > Is there a way to completely turn garbage collection off in the Haskell
>> > runtime system? I'm aware of the -A runtime option, but I'd like to
>> > completely turn it off, if possible. I'm OK with running the program
>> > until
>> > it runs out of memory, and I'm willing to recompile GHC if needed.
>> > Regards,
>> > Andreas
>> > _______________________________________________
>> > Haskell-Cafe mailing list
>> > Haskell-Cafe at haskell.org
>> > http://www.haskell.org/mailman/listinfo/haskell-cafe
>> >
>> >
>>
>>
>> _______________________________________________
>> Haskell-Cafe mailing list
>> Haskell-Cafe at haskell.org
>> http://www.haskell.org/mailman/listinfo/haskell-cafe
>>
>
>
> _______________________________________________
> Haskell-Cafe mailing list
> Haskell-Cafe at haskell.org
> http://www.haskell.org/mailman/listinfo/haskell-cafe
>
>