> -----Original Message-----
> From: Ruediger Pluem [mailto:rpl...@apache.org]
> Sent: vrijdag 6 oktober 2017 09:47
> To: Apache HTTP Server Development List <dev@httpd.apache.org>
> Subject: httpd memory consumption
>
> I am currently looking at a core of a httpd 2.4 process using the event MPM
> that consumed a lot of memory (core dump file size about 1.4 GB).
> While taking the core actually no request was processed by this process.
> I suspect a memory leak in a 3rd party closed source module.
> As I have no view in the 3rd party module I tried to find out the heap
> memory usage of httpd and the included modules.
>
> For this I used the new dump_pool_and_children I added to .gdbinit which
> delivers me the memory used by all pools below 'apr_global_pool' and the
> amount of memory in the allocator free lists associated to these pools.
> This delivered a usage of only a few MB. Of course I am aware that the
> process consumes additional memory for stack, static data and text
> segments, but this usage should be static.
>
> Is there any heap usage by httpd that I could have missed?
>
> - We do not use the unmanaged pools from APR. So I should have caught all
> pools.
> - I do no think that we use allocators that are not used by a pool. Hence I
> should have caught all allocators and
> its free lists.
> - As no request was processed when I captured the core (all worker threads
> were waiting for work) I doubt that missed
> any or at least large memory consuming buckets.
Is APR configured to return memory to the OS? Otherwise you might just see all
the allocated memory in the free list of the pool allocator(s).
Bert
