[rsyslog] memory alloc problems - any advise?

[RB]

On Fri, Jun 19, 2009 at 10:14, Rainer Gerhards<rgerhards at hq.adiscon.com> wrote:
> What is surprising is that the memory is not given back to the OS when the
> data has been processed. Well... I know that some data blocks may still be
> held and thus prevent giving memory back. But that should be solved when a
> few new messages come in. Still, nothing changes in that scenario. What
> puzzles me even more is that when I start a new burst of messages (I send
> around one million each), it looks like almost only new memory is obtained
> from the OS for them. At least here I had expected that the allocator would
> re-use what was already claimed.

Can you clarify what you mean by "not given back to the OS"?  Do you
mean that the RSS of rsyslog remains the same, or that the system
'free' memory does not go back up, or something else entirely?  I'm
wondering if you're seeing caching effects.