[OTDev] OpenAM performance
Vedrin Jeliazkov vedrin.jeliazkov at gmail.comTue Jul 5 17:51:10 CEST 2011
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Hi again, On 5 July 2011 16:09, Vedrin Jeliazkov <vedrin.jeliazkov at gmail.com> wrote: > As the number of policies in our test setup grows, this rough > estimation is confirmed: > > 10000 policies require about 1 GB of RAM allocated to the OpenDJ service The RAM allocated to the OpenDJ directory server seems to be the major bottleneck. However, it is also interesting to investigate the CPU usage averaged over a longer period of time. Here are the figures for the last 3 hours of stress testing: OpenDJ: 4691 seconds OpenAM+Policy+Ambit2: 327 seconds MySQL: 33 seconds This gives a ratio of 142:10:1. Please note that I've added indexes to the pol table in MySQL which has helped reducing MySQL CPU requirements and the overal latency of the service. Given these figures I think that there could be a certain benefit in hosting OpenDJ on a separate server (virtual or not), not just in a separate JVM instance. It also looks like that it can be tuned to hold the entire directory in memory. To achieve higher throughput the server should have the fastest possible memory bus and RAM, as well as a multi-core processor. BTW, OpenDJ has a very complex configuration with a lot of parameters that can be tweaked. I've already tried adjusting some of these parameters according to hints I found on the web, however any advice on further optimisations would be most welcome, since I'm not an OpenDS/OpenDJ/LDAP expert. Kind regards, Vedrin PS: We have 45K policies installed already and the test instance still has lower latency than the production one :-)
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