Zetan Drableg wrote: > openldap 2.4.57 on 16 core OracleLinux VMs with NVME disk. > 8 nodes in n-way multi master configuration, MDB backend, 50k unique DNs. > We see about 10,000 auths per minute per node. > > Under heavy client load, the log shows many "deferring operation: binding" > messages in the same second. slapd is using only 400% cpu (of 1600 possible).
Probably you could increase # of listeners. In a pure Bind-only workload slapd ought to be able to utilize 100% of all cores. > > [2021-04-13 19:15:58] connection_input: conn=150474 deferring operation: > binding > > When I write LDIFs to one node like delete user or remove user from group, we > see spikes in authentication latency metrics (what's normally .2 - .5 second > response time goes up to 15-30 seconds) across all nodes in the cluster at > the same time. > > What knobs can be adjusted to allow for more concurrency? It seems like > writes are impacting reads. You need more information, like I/O wait %, network % utilization, to identify the cause of these latency spikes. Nobody can suggest what to tune without knowing why the bottleneck occurs. -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/
