Need Help in porting Jemalloc.

[RajaKishore Sahu]

Hi,

Please provide your valuable inputs for my below question?

Thanks
Rajakishore

On Mon, Jan 18, 2016 at 8:23 AM, RajaKishore Sahu <raju.sahu at gmail.com>
wrote:

> Hi,
>
> I have a follow up question.
>
> We have only 40 MB of memory for our sub system.
>
> I start up Jemalloc is keep asking for new chunks and by the time the
> system becomes ready it almost consumes 38 MB of memory.
>
> How we can tell Jemalloc to uses already allocated memory chuck when we
> run out of our 40 MB of memory?
>
> Thanks
> Rajakishore
>
> On Tue, Oct 13, 2015 at 8:21 AM, RajaKishore Sahu <raju.sahu at gmail.com>
> wrote:
>
>> Hi Luke,
>>
>> Thanks for sharing the details. I will go through the code and come back
>> if I need some more help.
>>
>> Thanks
>> Rajakishore Sahu
>>
>> On Mon, Oct 12, 2015 at 5:09 PM, D'Alessandro, Luke K <
>> ldalessa at indiana.edu> wrote:
>>
>>>
>>> > On Oct 12, 2015, at 1:12 AM, RajaKishore Sahu <raju.sahu at gmail.com>
>>> wrote:
>>> >
>>> > Hi,
>>> >
>>> > I am trying to port Jemalloc. We are going to use it for our
>>> sub-system not for the whole system.
>>> >
>>> > Main system has its own memory manager. While initializing the
>>> sub-system (in boot up) we will allocate memory from main system (Ex:- 10
>>> MB) which will be contiguous memory then we want to give the start address
>>> and size to Jemalloc to manage it. Please let us know where to provide the
>>> start address to jemalloc?
>>>
>>> Hi. This dlmalloc-mspace-like interface isn’t really supported by
>>> jemalloc, which wants to be able to request “chunks” of memory from the
>>> system using a chunk allocator (typically mmap()).
>>>
>>> To do what you want you need to write a chunk provider based on [the
>>> chunk hooks class](
>>> http://www.canonware.com/download/jemalloc/jemalloc-latest/doc/jemalloc.html),
>>> and then install it for all of the threads in your code. Your chunk
>>> provider will have to give jemalloc chunks from your contiguous region.
>>>
>>> We do this in HPX-5 to manage a network-registered global heap. The
>>> callback chunks are [here](
>>> https://gitlab.crest.iu.edu/extreme/hpx/blob/develop/libhpx/gas/pgas/jemalloc_global.c)
>>> and the “heap” is implemented (here)[
>>> https://gitlab.crest.iu.edu/extreme/hpx/blob/develop/libhpx/gas/pgas/heap.c].
>>> This code is slightly complex but it’s basically just using a bitmap to
>>> allocate chunks from a large contiguous heap, and can serve as an example
>>> for you.
>>>
>>> > Main system will provide thread, Mutex/Semaphore and the memory for
>>> this will not be allocated from the sub-system. In this scenario how can we
>>> enable thread caching? We do have a rapper to create threads, which means
>>> we know which are the the threads created by sub-system. Will it help in
>>> enabling the thread caching?
>>>
>>> Thread caching will likely be on by default for the threads. In more
>>> complex code where you might want to manage more than one memory space, you
>>> may need to explicitly allocate new caches.
>>>
>>> Luke
>>>
>>> >
>>> > Any help will greatly appreciated!
>>> >
>>> >
>>> > --
>>> > Thanx
>>> > Rajakishore Sahu
>>> > Mail:-raju.sahu at gmail.com
>>> > _______________________________________________
>>> > jemalloc-discuss mailing list
>>> > jemalloc-discuss at canonware.com
>>> > http://www.canonware.com/mailman/listinfo/jemalloc-discuss
>>>
>>>
>>
>>
>> --
>> Thanx
>> Rajakishore Sahu
>> Mail:-raju.sahu at gmail.com
>> Mobile:-+91 9886719841
>>
>
>
>
> --
> Thanx
> Rajakishore Sahu
> Mail:-raju.sahu at gmail.com
> Mobile:-+91 9886719841
>



-- 
Thanx
Rajakishore Sahu
Mail:-raju.sahu at gmail.com
Mobile:-+91 9886719841
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