Low Performance on Parallel request

[feters]

Hello, I am Feter, a Master's student at Lulea University.
I did a local test on Docker container using Neqo Server against Pico Client and the result is surprisingly low compared to other QUIC server implementations as far as I know Rust is a performance language. I used Ubuntu 20.04 image for the server and client. This is the result and how I did run the test:

Run Neqo Server
ionice -c 2 -n 0 nice -n -20 env RUST_LOG=trace cargo run --bin neqo-server -- [::]:7733 --db ./test-fixture/db --qlog-dir server_qlog

Test Case
Transfer file of 1GB in parallel 10 times

Parallel Request	10	50	100
Throughput (Mbps )	179.468	23.564	15.011
RTT (Seconds)	1.79	8.043	13.074
Transfer Time (Seconds)	7.622	50.988	75.424

Are there any extra things I can do to increase the performance?
Thank you.

[martinthomson]

Rust might have low overheads, but it's possible that our code does not.

One major factor here is likely that our server is single-threaded. It exists primarily so that we are able to test our client; no significant effort has been put into making the server performant.

[junhochoi]

@feters I think you can try again without RUST_LOG=trace and --qlog-dir option for less verbosity and add --release to cargo run and see the difference.

[feters]

@martinthomson thank you
@junhochoi Okay I will try that, thank you very much

[larseggert]

Closing. @feters please reopen if this is still an issue.