Re: Performance issue with In-Memory BDB

[Howard Chu <hyc@symas.com>]

Suhel Momin wrote:
> Hi,
>
>     I have made changes such that backend BDB ( ver 4.5 ) resides in 
> memory instead of on disk . This is with default slapd configuration.
> I was hoping to have a better performance with this.

back-bdb as currently residing in HEAD already yields efficiencies of 95% of 
available system bandwidth. It is extremely unlikely that you are going to be 
able to improve the performance significantly, most changes you could make to 
the code at this point will only yield performance losses.

> But what I now see 
> is that do_add  takes much more time then what it use to take when BDB 
> was on-Disk. Indexing is done on objectclass in both the cases.
>
> Any pointers on why this could be an issue?

--
  -- Howard Chu
  Chief Architect, Symas Corp.  http://www.symas.com
  Director, Highland Sun        http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP     http://www.openldap.org/project/