Need Help in porting Jemalloc.

[RajaKishore Sahu]

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
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