Possible performance degration compare to old Akka?

[He-Pin]

My colleague reported that she experienced performance degradation after upgrading from Akka 2.6.1 to Pekko 1.2.0. She compiled with Scala 2.13 and had the same number of threads and configuration. Is this possible?

[pjfanning]

While unfortunate, there is not much in this description to help in analysis. Elsewhere, you mentioned a colleague who used Artery remoting. Maybe that is the case here.
There are 3 years of changes between Akka 2.6 and Pekko 1.2.
Most of the changes were small but maybe 1 or more them have had unexpected impacts on performance. Some of changes were meant to improve performance but a lot of those relate to reducing allocations as opposed to fundamental rewrites. One big change was the switch to Netty 4 but I'm not sure if that affects this case.
If you are not using remoting, maybe a Java profiler can help catch hotspots. If remoting/clustering are in use, maybe open telemetry or Kamon could help. Both have Pekko support.

[He-Pin]

yes, but she gives me.nothing too...