Re: ldapsearch hangs

[Quanah Gibson-Mount <quanah@zimbra.com>]

--On Thursday, September 10, 2009 10:07 PM +0200 Tihomir Culjaga 
<tculjaga@gmail.com> wrote:

> wow, Quanah,
>
> that's the best answer i ever got...
>
> I'm gong to move to 2.4.18 and try to tune up the machine... regarding
> more RAM ... i can get it but not tha fast.
>
> what can i expect with a total of 10 GB ?...
>
> I plan to set set_cachesize 7 0 1
>
> what is the relation between cachesize (in slapd.conf) and set_cachesize
> (in DB_CONFIG)?

They aren't related.  cachesize (in slapd.conf) is for the entry cache. 
set_cachesize is for the BDB backing cache.

> set_cachesize =>how much memory i wiill cache
> cachesize => number of entries i will keep within the cache
>
> how much one entry take ?
>
> Lets say if i use 7 GB of cache, what cachesize should i put?

Hard to say. ;)  A bit of the BDB cache will likely be swapped out.

You may also want to read:

<http://wiki.zimbra.com/index.php?title=OpenLDAP_Performance_Tuning_6.0>

It has some zimbra specific commands in it, but it should be fairly trivial 
to see how it maps to your openldap install.  I'd also particularly read 
over the bit about using a shared memory key for the BDB cache once you go 
beyond 8GB cachesize (which you will do after you get more RAM. ;) ).

--Quanah

--

Quanah Gibson-Mount
Principal Software Engineer
Zimbra, Inc
--------------------
Zimbra ::  the leader in open source messaging and collaboration