UE4 Actor Replication(同步)的性能問題

來源： 52vr | 責(zé)任編輯：傳說的落葉 | 發(fā)布時(shí)間： 2019-06-06 08:26 | 瀏覽量：

看了下相關(guān)文檔，UE自帶的Replication機(jī)制效率還是很低的，UE為了提供通用的同步功能，這個(gè)Replication實(shí)現(xiàn)的非常簡(jiǎn)單粗暴，如果是承載客戶端鏈接很多的項(xiàng)目，這個(gè)Replication貌似不可取，最好還是根據(jù)自己的項(xiàng)目需求自己實(shí)現(xiàn)一套同步機(jī)制。

關(guān)掉Replication：
AActor::SetReplicates( false )

如果實(shí)在要用Replication，可以降低更新頻率來提升效率：
AActor::NetUpdateFrequency()

2016-03-29補(bǔ)充：

v4.4開始，shipping編譯出來的版本，會(huì)自動(dòng)禁用Replication，所以如果是對(duì)通信性能較高的項(xiàng)目，Replication不要用，只能作為測(cè)試工具使用。

Dedicated server connection

https://answers.unrealengine.com/questions/70015/dedicated-server-connection.html

官方解釋：

Performance and Bandwidth Tips

https://docs.unrealengine.com/latest/INT/Gameplay/Networking/Actors/ReplicationPerformance/

When gathering actors for replication, the server will check a few things like relevancy, update frequency, dormancy, etc. You can tweak any of these checks to affect performance. When thinking about making this process as efficient as possible, it's best to prioritize in this order:

Turning off replication (AActor::SetReplicates( false ))
- When is actor is not replicating, it's not on the list in the first place, so this is the biggest win, to make sure actors that don't need to replicate are marked as such.
Lower NetUpdateFrequency value
- The less an actor updates, the less time it takes to update. It's best to make this number as low as possible. This number represents how often per second this actor will replicate to clients.
Dormancy
Relevancy
NetClientTicksPerSecond

Don't mark properties to replicate if they aren't absolutely necessary. It's best to try and derive state from existing replicated properties when possible.

Try to take advantage of the quantization functionality that already exists. e.g. FVector_NetQuantize. These will greatly reduce the size needed to replicate this state over to clients, and if used properly, shouldn't cause any noticeable artifacts.

FNames are not generally compressed, so when you are using them as parameters to RPCs, keep in mind that they will generally send the string each call. This can be a lot of overhead.

另一篇關(guān)于UE的Replication解釋：
Everything you ever wanted to know about replication (but were afraid to ask)

https://wiki.beyondunreal.com/Everything_you_ever_wanted_to_know_about_replication_(but_were_afraid_to_ask)#Thi