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Re: Help: Slow LDAP search with high %iowait
Victor <email@example.com> writes:
> Hi Dieter,
> Many thanks for your response. I increased the cache size by 10 times in both
> slapd.conf and DB_CONFIG. The performance got improved, but not impressive.
> For example,
> Searching by first name only using "scott*" only (for wildcard) for the 1st
> time still took 12937 ms to find 881 users (BTW, I was using SpringLDAP Java
> client). My other responses are inline.
Ah, java clients. Performance of java clients is really a design
matter. To my experience in most cases java clients are badly designed
and in most cases responsible for performance loss.
Try OpenLDAP tools or a benchmarking tool to get comparable results.
time ldapsearch <parameters>,
> I wanted to consider scaling factor. If we use OpenLDAP in production, we will
> have over 350million user entries. I probably don't want to put so many
> entries in cache unless it is really needed. That is why I used a relatively
> small cache in my prorotyping (in the hope it can scale up).
Howard Chu has conducted some large scale tests, search the archive
for his reports.
> Did I have a flaw in organizing/grouping the data/entries? Any further advice
> will be greatly appreciated. Thanks.
Dieter Klünter | Systemberatung
GPG Key ID:8EF7B6C6