Enable QUIC transport protocol for DCV on head node

[elduds]

DCV on the head node leverages the default transport protocol configuration of WebSockets over TCP, but it can support QUIC with minor backwards-compatible configuration change.

I enable QUIC by default as my users are up to 300msec from our preferred Parallel Cluster region and experience significant latency, jitter & packet loss, which are far more tolerable using QUIC.

Regardless, given the performance improvements, I think the project should consider enabling QUIC by default, but at the very least make it optional, given that the worst-case outcome is any network or client issues when attempting QUIC simply result in graceful fallback to the existing TCP-based connections.

One complication is that QUIC is only supported using the DCV thick client, not via web browser.

Proposed changes required:

1. Set enable-quic-frontend=true in /etc/dcv/dcv.conf
2. Add UDP/ from in the head node security group
3. Update pcluster dcv-connect to test for & launch the thick client after fetching session credentials

[elduds]

FWIW I'm using

• Parallel Cluster v3.8.0
• AWS ParallelCluster AMI for alinux2, kernel-5.10.201-191.748.amzn2.x86_64, lustre-2.12.8-2.amzn2.x86_64, efa-2.6.0-1.amzn2.x86_64, dcv-2023.0.15487-1.el7.x86_64, nvidia-535.129.03, cuda-12.2.20230823

[himani2411]

Hi elduds,

I have added this in our Backlog. Thank you for the proposed changes.