Re: Scaling for performance : Results and comments????

[Howard Chu <hyc@symas.com>]

Trevor Warren wrote:

> Fellas,
>
>  Thanks for your help. The results for the same are as
> below. Averaged at about 100+ writes/sec(See TPS).
> This setup is DB(4.2.52 + patches) and OpenLdap
> 2.2.12. for results see below.....
>
>  During one such test with the same config i had
> openldap crash with following msg:
>
> "[root@blade2 openldap]# ../../libexec/slapd -d0
> slapd: ch_malloc.c:122: ch_calloc: Assertion `0'
> failed.
> slapd: ch_malloc.c:122: ch_calloc: Assertion `0'
> failed.
> slapd: modify.c:957: slap_mods_opattrs: Assertion
> `mod->sml_mod.sm_nvalues[0].bv_val' failed.
> slapd: modify.c:957: slap_mods_opattrs: Assertion
> `mod->sml_mod.sm_nvalues[0].bv_val' failed.
> Aborted"

Well, technically, an assert() due to malloc failure isn't a "crash." 
I.e., in this case, it's not the result of a coding bug, it's just the 
result of the slapd process being unable to allocate any more memory. 
First you should check what resource limits are in effect (if any) and 
then you should monitor the slapd process size wrt the total amount of 
memory on your machine. You're clearly running into one of these two 
(logical vs physical) limits, and you need to raise them to avoid this 
problem.

--
  -- Howard Chu
  Chief Architect, Symas Corp.       Director, Highland Sun
  http://www.symas.com               http://highlandsun.com/hyc
  Symas: Premier OpenSource Development and Support