HTTP/2 benchmarks

[JamesNK]

Create a suite of benchmarks at https://github.com/aspnet/benchmarks to cover most common user scenarios. Can reuse profiling/investigation samples - #13745

• TechEmpower plaintext but over HTTP/2
• Basic POST. Request is text/plain string of name. Reply is text/plain "Hello " + name
• Stream per connection vs multiple streams on one connection
• H2 vs H2C
• gRPC benchmarks. Will be created by gRPC team - Set up benchmark scenarios grpc/grpc-dotnet#6
  • Unary
  • Server streaming
  • Large messages
• Kestrel and IIS HTTP/2 benchmarks

Some of these benchmarks may already exist.

[JamesNK]

FYI I investigated lock contention in gRPC benchmarks. The lock contention is coming from HTTP/2 transport, and is visible in all HTTP/2 benchmarks.

Scenario: JSON
Yellow: h2
Black: http