Re: Help: Slow LDAP search with high %iowait

Hi, Victor&lt;victorfuman(a)yahoo.com&gt; 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. Something like time ldapsearch<parameters>, charge, http://loadtesting.sourceforge.net, slamd, http://www.slamd.com. > 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.