Gather Arena stats

[Jason Evans]

On Nov 26, 2013, at 11:40 AM, Eduardo Silva <edsiper at gmail.com> wrote:
> i am interested into gather memory usage per Linux thread, as i am using jemalloc i think this can be done quering the arenas per thread. if i am correct, do you have some code example that accomplish something similar to this ?

Threads don't own memory; allocated regions can be shared among threads, and allocation/deallocation can be split between threads.  That said, jemalloc does track total volume of allocation and deallocation on a per thread basis, so you can derive the information you want as long as you account for allocated regions that are shared among threads.  Take a look at the "thread.allocated" and "thread.deallocated" mallctl() interfaces in the man page:

	http://www.canonware.com/download/jemalloc/jemalloc-latest/doc/jemalloc.html

There is a relevant test program included with jemalloc:

	https://github.com/jemalloc/jemalloc/blob/dev/test/allocated.c

Jason
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