Re: Recommended SLAPD cache sizes

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Hi Paul,


On 7/16/19 9:16 AM, Paul Whitney wrote:
Is there some formula or recommendation on determining what would be the optimal cache settings for a directory server (389-ds of course) with following sizes? I looked at the DS 10 Admin Guide online and am getting conflicting information.  But the manual shows a table and suggests that the max size for the cn=config dbcache is 512MB.
There is no limit on the cache size value besides what you are limited to by a unsigned long integer.  Do you have a link to where it says 512 MB is a maximum?
  But I tried with 5GB and it appears to work fine with it, although over time start to see negative values (prob not enough cache) and roevicts while running the dbmon.sh script.

__db files = ~6GB
groupRoot = 1.5GB
userRoot = 20GB

What values would yield best performance for:

cn=config dbcache? currently set to 5GB but are still seeing lots of roevicts. As much 

userRoot entry cache? currently set to 21GB (hit ratio so far at 95%)

groupRoot entry cache? currently set to 2GB (hit ration so far at 96%)

Virtual machine configured with 8CPU, 128GB RAM. Load is in the low 20's with occasional spikes to high 20's.

If you have 128 GB available to you then I would continue to increase the cache sizes until you get to 99% hit ratio for the two entry caches, and the db cache.  Also make sure the DN and NDN caches also have a 99% cache hit ratio:


https://access.redhat.com/documentation/en-us/red_hat_directory_server/10/html/performance_tuning_guide/tuning-dn-cache


https://www.port389.org/docs/389ds/design/normalized-dn-cache.html




I would also look into running the DB on a RAM disk since you have the resources to do so:


https://access.redhat.com/documentation/en-us/red_hat_directory_server/10/html/performance_tuning_guide/tuning-db-cache#db-cache-on-ram-disk



HTH,

Mark



Paul M. Whitney, RHCSA, CISSP
Chesapeake IT Consulting, Inc.

2680 Tobacco Rd

Chesapeake Beach, MD 20732 


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