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https://issues.apache.org/jira/browse/JAMES-3086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17051908#comment-17051908
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Rashid Mahmood commented on JAMES-3086:
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I would appreciate if we get some input to tune the Apache James for best
possible performance. What options we have to tune ActiveMQ, Cassandra? Is
there any possibility to Reduce Thread(s) blocking as observed in attached
thread dump?
> Mail Server Load Test giving very low throughput
> ------------------------------------------------
>
> Key: JAMES-3086
> URL: https://issues.apache.org/jira/browse/JAMES-3086
> Project: James Server
> Issue Type: Bug
> Components: POP3Server, SMTPServer
> Affects Versions: 3.3.0
> Reporter: Rashid Mahmood
> Priority: Blocker
> Attachments: executors-waiting-to-acquire.png,
> image-2020-03-04-09-30-30-054.png, threaddump.txt
>
>
> 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?
> !image-2020-03-04-09-30-30-054.png!
>
> See the thread dump in attachment.
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