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Akka-Cluster: Decreasing system performance having many active actors

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Hello everyone,

we are running an actor system (cluster sharding) having about 5 Million per node. With a constant inbound message rate we are seeing the system slowing down having more and more actors in memory.

few actors: 1 ms
5M actors: > 200 ms

Does the amount of active but unused actors have a significant negative impact on the latency?

System:

  • 5 node cluster
  • akka-cluster-sharding
  • akka-persistence-cassandra

F.e. does the dispatcher need to check 5M mailboxes when only 1K mailboxes have messages?

Thanks in advance and best regards
Thomas S.

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