icerpc
Slow Quic tests on Linux
On Linux, the Quic tests take more than 30s to complete. They used to complete much faster and they still do on Windows.
I'm seeing this since I switched to Ubuntu 22.04.
I don't have this issue on Debian... I suspect this has something to do with the use of openssl 3.x for msquic.
libmsquic is not available yet for Debian 12 so I haven't been able to try it out.
There are many reports of serious performance issues with OpenSSL 3, in particular with multithreaded code.
See:
- https://github.com/openssl/openssl/issues/17627
- https://github.com/openssl/openssl/issues/17064
If I patch the protocol tests to run with Quic I'm getting all kind of timeouts.
A bandaid fix is to reduce the number of workers:
| Worker Count | Time to run the Quic tests |
|---|---|
| 1 | 39 s |
| 2 | 25 s |
| 3 | 26 s |
| 4 | 47 s |
Looks a worker count of 2 provides the "best" performances :flushed:.