Re: slapd leaking memory on i386?

[Howard Chu <hyc@symas.com>]

John Morrissey wrote:
> 2.4.16 (with BDB4.7 + patches and the POSIX threads build options) has been
> stable on amd64/x86_64 for us, but I'm encountering problems with 2.4.16 on
> i386.

On what OS?

I've been seeing similar issues on Linux, but using heap profilers / leak 
checkers don't turn up any results. At least in the Linux case, it appears to 
be general heap fragmentation caused by continual mmap/munmap of malloc'd 
memory blocks.

> slapd will run happily for several hours at a RSS of ~1.2GB, but then will
> suddenly gobble memory until it hits the i386 address space limit of 3GB and
> dies due to random segfaults as memory allocation fails. BDB caches are set
> to ~1.25GB total and the entry cache to 10,000 entries. I'm not sure how
> long it takes slapd to consume the extra 2GB of memory, but it's definitely
> less than 20 minutes according to sar(1).
>
> I have a couple core files from when this happens. Are there structures that
> are likely suspects for unchecked growth (the entry and BDB caches, for
> example) that I can poke at with a debugger to get an idea what's going on?
>
> john


--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
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