[JAMES-3086] Mail Server Load Test giving very low throughput

• Type: Bug
• Status: Open
• Priority: Blocker
• Resolution: Unresolved
• Affects Version/s: 3.3.0
• Component/s: POP3Server, SMTPServer
• Assignee: Unassigned
• Reporter: Rashid Mahmood
• Created: 04/Mar/20 08:38
• Updated: 05/May/22 04:56

Description

After functional tests, we are performing load tests against James Server setup with Casandra/Elasticsearch(cassandra-ldap-guice) packaging option. With JMeter constant throughput timer of 300 SMPT requests per seconds we are achieving around 10 requests per seconds. Each Request is with 100KB attachment. Observed CPU of the machine (where MailServer running) was over exhausted.

Many of the threads in thread dump were in awaiting notifications state.

I see around 100 threads from Elastic search, is there any configuration to control this?

Where is the bottleneck?

 
See the thread dump in attachment.