Akka 1.4.25

Maintenance Release for Akka.NET 1.4** Akka.NET v1.4.25 includes some significant performance improvements for Akka.Remote and a number of important bug fixes and improvements. Bug Fixes and Improvements** Akka.IO.Tcp: connecting to an unreachable DnsEndpoint never times out Akka.Actor: need to enforce stdout-loglevel = off all the way through ActorSystem lifecycle Akka.Actor: Ask should push unhandled answers into deadletter [Akka.Routing: Make Router.Routevirtual](https://github.com/akkadotnet/akka.net/pull/5238) [Akka.Actor: Improve performance onIActorRef.ChildAPI](https://github.com/akkadotnet/akka.net/pull/5242) - _signficantly_ improves performance of many Akka.NET functions, but includes a public API change onIActorRefthat is source compatible but not necessarily binary-compatible.IActorRef GetChild(System.Collections.Generic.IEnumerable name)is nowIActorRef GetChild(System.Collections.Generic.IReadOnlyList name). This API is almost never called directly by user code (it's almost always called via the internals of the ActorSystemwhen resolvingActorSelections or remote messages) so this change should be safe. [Akka.Actor: IsNobodythrows NRE](https://github.com/akkadotnet/akka.net/issues/5213) [Akka.Cluster.Tools: singleton fix cleanup of overdue _removed members](https://github.com/akkadotnet/akka.net/pull/5229) [Akka.DistributedData: ddata excludeExitingmembers in Read/WriteMajorityPlus](https://github.com/akkadotnet/akka.net/pull/5227) Performance Improvements** Using our standard RemotePingPong` benchmark, the difference between v1.4.24 and v1.4.24 is significant: v1.4.24

OSVersion:                         Microsoft Windows NT 6.2.9200.0
ProcessorCount:                    16
ClockSpeed:                        0 MHZ
Actor Count:                       32
Messages sent/received per client: 200000  (2e5)
Is Server GC:                      True
Thread count:                      111
Num clients, Total [msg], Msgs/sec, Total [ms]
1,  200000,     96994,    2062.08
5, 1000000,    194818,    5133.93
10, 2000000,    198966,   10052.93
15, 3000000,    199455,   15041.56
20, 4000000,    198177,   20184.53
25, 5000000,    197613,   25302.80
30, 6000000,    197349,   30403.82

v1.4.25

OSVersion:                         Microsoft Windows NT 6.2.9200.0
ProcessorCount:                    16
ClockSpeed:                        0 MHZ
Actor Count:                       32
Messages sent/received per client: 200000  (2e5)
Is Server GC:                      True
Thread count:                      111
Num clients, Total [msg], Msgs/sec, Total [ms]
1,  200000,    130634,    1531.54
5, 1000000,    246975,    4049.20
10, 2000000,    244499,    8180.16
15, 3000000,    244978,   12246.39
20, 4000000,    245159,   16316.37
25, 5000000,    243333,   20548.09
30, 6000000,    241644,   24830.55

This represents a 24% overall throughput improvement in Akka.Remote across the board. We have additional PRs staged that should get aggregate performance improvements above 40% for Akka.Remote over v1.4.24 but they didn't make it into the Akka.NET v1.4.25 release. You can see the full set of changes introduced in Akka.NET v1.4.25 here | COMMITS | LOC+ | LOC- | AUTHOR | | --- | --- | --- | --- | | 32 | 1301 | 400 | Aaron Stannard | | 4 | 358 | 184 | Andreas Dirnberger | | 3 | 414 | 149 | Gregorius Soedharmo | | 3 | 3 | 3 | dependabot[bot] | | 2 | 43 | 10 | zbynek001 | | 1 | 14 | 13 | tometchy | | 1 | 139 | 3 | carlcamilleri |