Tested with the following runtimes.

• glommio
• Tokio
• smol
• async-std
• minimum (simple runtime that shares nothing between CPUs and uses io_uring API with IORING_OP_POLL_ADD)

• Server: c6gn.8xlarge (32 vCPU/64 GiB)
• Client: c5n.9xlarge (36 vCPU/96 GiB)

ghz --insecure --proto helloworld.proto --call helloworld.Greeter.SayHello -d '{\"name\":\"Joe\"}' --connections=3000 172.31.22.145:50051 -c 12000 -n 3000000 -t 0

• One client machine runs 3,000 gRPC clients (i.e. 3,000 HTTP/2 clients).
• One client machine issues 3,000,000 requests in total.
• Tested with one, two, four, and eight client machines.

Note that glommio couldn't complete the benchmark with 24,000 clietns.