Re: [MirageOS-devel] Memory exhaustion in Mirage

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

CCing the list.

> On 19 Dec 2014, at 08:49, Masoud Koleini <masoud.koleini@xxxxxxxxxxxxxxxx> 
> wrote:
> 
> I have added the function to stub_alloc_pages.c and defined it as external 
> function in io_page.ml. No problem in installing io_page, but when compiling 
> the program, I receive the error:
> 
> undefined reference to `caml_dealloc_page'
> 
> how do you think I can fix it?
> 
> Thanks.
> 
> On 18/12/14 13:46, Anil Madhavapeddy wrote:
>> Not at the moment, although we could easily add an explicit deallocator into
>> Io_page.  You need to very careful that the page is not used after its 
>> lifetime,
>> so more pool-based abstractions are preferred (where the pages are recycled 
>> into
>> an OCaml-managed data structure and reused rather than GCed).
>> 
>> You should be able to pump up the amount of RAM the VM gets temporarily to 
>> 4GB
>> or so -- if the page allocator still remains low, then it's unlikely to be a 
>> GC
>> issue and an actual leak somewhere due to holding onto references and keeping
>> the page live.
>> 
>> -anil
>> 
>>> On 18 Dec 2014, at 05:41, Masoud Koleini <masoud.koleini@xxxxxxxxxxxxxxxx> 
>>> wrote:
>>> 
>>> Is it possible to deallocate an Io_page after packet is send, not to wait 
>>> for GC?
>>> 
>>> On 16/12/14 23:45, Anil Madhavapeddy wrote:
>>>> On 16 Dec 2014, at 15:23, Masoud Koleini <masoud.koleini@xxxxxxxxxxxxxxxx> 
>>>> wrote:
>>>>> I am wondering if the following issue is already addressed:
>>>>> 
>>>>> https://github.com/mirage/mirage-tcpip/issues/33
>>>>> 
>>>>> https://lists.cam.ac.uk/pipermail/cl-mirage/2013-August/msg00104.html
>>>>> 
>>>> It probably still happens at 64MB of RAM -- it requires some code to adjust
>>>> the GC parameters in the OCaml runtime to trigger a collection more often.
>>>> It should be harmless however, since (as the bug report observes), a 
>>>> failure
>>>> to allocate an Io_page results in a GC compaction that frees up memory so
>>>> that the allocation eventually succeeds.
>>>> 
>>>> Any particular reason for asking -- is the bug affecting your switch 
>>>> somehow?
>>>> 
>>>> -anil
>>> 
>>> 
>>> 
>>> 
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> 
> 
> 
> 
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