工具
https://medium.com/neobards/ue4-network-profiler-1-fa8a22372d46
这里面是总结使用UE4 Replicate系统进行优化
首先介绍一些调试命令
net.Reliable.Debug 2 查看Reliable 的RPC函数（具体看函数发起在哪 如果是客户端发起调用，那么只能在客户端查看到该命令的rpc，以下命令也是这种情况）
net.ListActorChannels 查看同步的actor
net.RPC.Debug 1 查看RPC函数调用
netprofile 切换停止/开始录制net profiler数据
1.设置Actor的更新频率，对于一些不需要频繁更新状态的actor可以将频率设置的很低，当需要执行具体联网操作时调用ForceNetUpdate进行更新，例如一扇门，只有打开关闭的时候 调用ForceNetUpdate（注意不要使用Reliable的rpc函数，如果使用的话是会无视更新频率的）
2.设置NetCull距离 注意 这里面的数值是距离的平方 也就是说默认的距离实际是15000（150m）
3.使用NetworkProfiler查看网络信息
工具的位置在引擎Engine\Binaries\DotNET 查看的数据通过netprofile命令获得位置在工程/Saved\Profiling
如果没有特殊设置的 一般默认的17777是客户端 61358是作为服务器端
4.设置Actor的Net Dormancy属性
如果设置为Initial的时候 actor不进行复制 可以通过蓝图SetNetDormancy修改该值，经过测试 设置为其他任何值都会进行复制， 同样有FlushNetDormancy进行强制刷新（应对NetUpdateFrequency比较低的情况）
5.就是参照NetSerialization.h中的说明 自己创建需要复制的struct 并进行序列化
可以手动确定哪些变量进行复制
USTRUCT(BlueprintType)
struct FTestA
{
GENERATED_USTRUCT_BODY()
public:
UPROPERTY(BlueprintReadWrite)
int a;
UPROPERTY(BlueprintReadWrite)
int b;
/**
* @param Ar FArchive to read or write from.
* @param Map PackageMap used to resolve references to UObject*
* @param bOutSuccess return value to signify if the serialization was succesfull (if false, an error will be logged by the calling function)
*
* @return return true if the serialization was fully mapped. If false, the property will be considered 'dirty' and will replicate again on the next update.
* This is needed for UActor* properties. If an actor's Actorchannel is not fully mapped, properties referencing it must stay dirty.
* Note that UPackageMap::SerializeObject returns false if an object is unmapped. Generally, you will want to return false from your ::NetSerialize
* if you make any calls to ::SerializeObject that return false.
*
*/
bool NetSerialize(FArchive& Ar, class UPackageMap* Map, bool& bOutSuccess)
{
// Your code here!
Ar << a;
return false;
}
/**
* @param DeltaParms Generic struct of input parameters for delta serialization
*
* @return return true if the serialization was fully mapped. If false, the property will be considered 'dirty' and will replicate again on the next update.
* This is needed for UActor* properties. If an actor's Actorchannel is not fully mapped, properties referencing it must stay dirty.
* Note that UPackageMap::SerializeObject returns false if an object is unmapped. Generally, you will want to return false from your ::NetSerialize
* if you make any calls to ::SerializeObject that return false.
*
*/
bool NetDeltaSerialize(FNetDeltaSerializeInfo& DeltaParms)
{
// Your code here!
return false;
}
};
template<>
struct TStructOpsTypeTraits< FTestA > : public TStructOpsTypeTraitsBase2< FTestA >
{
enum
{
WithNetSerializer = true,
WithNetDeltaSerializer = false,
};
};