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License: Apache License 2.0
Akka.Remote gRPC transport
License: Apache License 2.0
The initial performance numbers were about 1/5-1/6 of what DotNetty can do, and one of the reasons why I believe this is the case is that gRPC performs a flush on each write to the stream - and you're required to wait for that flush to complete prior to sending the next message. Thus we have a flow control problem that eats up an enormous amount of CPU and destroys throughput.
We need to do what we did in DotNetty a long time ago and add something similar to our https://github.com/akkadotnet/akka.net/blob/dev/src/core/Akka.Remote/Transport/DotNetty/BatchWriter.cs - which is able to group pending writes together into a continuous (but frame-length encoded) chunk that gets flushed as soon as the transport is ready again.
I think we can do this by simply modifying our Protobuf message definitions to contain arrays of ByteString
rather than a single payload - and we can use semantics similar to what the BatchWriter
does.
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