Re: dynlist vs memberof performance issues

On 7/25/2022 10:38 AM, Shawn McKinney wrote: I'm still seeing performance issues with queries that simply return memberOf, with no reference to it in the actual search filter. For example, this query which searches on the static uid attribute and returns memberOf: time ldapsearch -H ldapi:/// uid=henson memberOf Most of the time it completes in fractions of a second: real 0m0.187s user 0m0.005s sys 0m0.003s But sometimes it takes 5 seconds, 10 seconds, or even more. These extremely slow response times coordinate with a high read I/O percentage on the server and the high number of page faults on the slapd process. When I first deployed 2.5, sometimes the server would get into a state where every query that requested memberOf would take in excess of 30 seconds to return until the server was restarted. I cranked up the memory on the servers and at this point I have had no more reoccurrences of that behavior, but I am still regularly seeing occasional slow performance on the queries and high read I/O percentages. The servers have way more memory now than they should need to fully cache the entire database: # du -sh /var/symas/openldap-data-cpp 2.6G /var/symas/openldap-data-cpp # free -m total used free shared buff/cache available Mem: 4818 703 124 0 3991 3831 Swap: 2047 136 1911 I haven't been able to correlate the slow response times with any other external criteria such as updates or query load. Sometimes it's just slow 8-/. We never saw this problem under 2.4 which used the previous implementation of dynlist to generate memberOf. I definitely appreciate the ability to query on dynamic memberOf that was added in 2.5, but it would be nice to sort out this performance issue.