2010/8/2 Rich Megginson rmeggins@redhat.com
Juan Asensio Sánchez wrote:
Hi
I am trying to tune the performance of the Directory Server. We have increased the memory for the database cache and for each database entry cache. These are the new values:
cn=config, cn=ldbm database, cn=plugins, cn=config nsslapd-dbcachesize: 838860800 (~800MB)
cn=*,cn=ldbm database, cn=plugins, cn=config nsslapd-cachememsize: 125829120 (~120MB)
We have 27 databases, and the servers have 16 GB of RAM, so the server should be able to handle all that memory (800 + 120*27 = 4040MB). But when I go to the monitoring section of the management console, the database cache says the hit ratio is 99% (this is OK according to the documentation, near 100%), but the entry cache is 0%, that is very far for 100% that the documentation recomends (see screenshots attached). Am I confused or the configuration is not correct?
When you start out with an empty cache, the cache hit ratio will be 0 until entries get into the cache and are pulled from the cache rather than the database.
Try doing a search like ldapsearch ... -b "basesuffixofdatabase" "objectclass=*"
Well, the servers are running for a long time, not only a days. I have done that search, but the "Entry cache hit ratio" remains 0. I have also noticed that "Current entry cache size (in entries)" is only 4168, even after the search, although out directory cointains about 50000 entries. Is this normal?
Regards.