On Jun 4, 2016, at 3:22 PM, Bill O'Hara <[email protected]> wrote:
> I see various hints that it's possible to use jemalloc to manage a given
> memory space. That is, given a pointer to say 16GB of byte addressable
> memory, use jemalloc to manage it as a heap.
>
> 1) Can someone point me in the direction of a simple example, or hints on how
> to configure jemalloc to do this?
Here's the relevant documentation:
http://www.canonware.com/download/jemalloc/jemalloc-latest/doc/jemalloc.html#arena.i.chunk_hooks
Here's a test case that gives a basic example of how to use the chunk hooks API:
https://github.com/jemalloc/jemalloc/blob/master/test/integration/chunk.c
> 2) Further -- is it possible to get jemalloc to put it's own data structures
> entirely within the given 16GB space, so that if the process restarts that
> the heap can be reattached?
No, there are lots of places where jemalloc uses static data, and it's
generally important to performance to do so. As of 4.2.0, application-created
arenas (see
http://www.canonware.com/download/jemalloc/jemalloc-latest/doc/jemalloc.html#arenas.extend)
put all their metadata in one of the automatically multiplexed arenas so that
it's possible to discard the contents of an arena with a single call
(http://www.canonware.com/download/jemalloc/jemalloc-latest/doc/jemalloc.html#arena.i.reset),
which is sort of the opposite of what you want.
Jason
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