feat: add --track-peak-rss to daemon

[hanabi1224]

Summary of changes

Changes introduced in this pull request:

RSS is included in Prometheus metrics but it's still helpful to track and print it when forest is not in long-running mode (e.g. --halt-after-import), so that we could easily get peak RSS usage from log when running forest --import-snapshot [path] --halt-after-snapshot --track-peak-rss without using an external monitoring script, to fill in benchmark tables

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation,
• I have added tests that prove my fix is effective or that my feature works
  (if possible),
• I have made sure the
  CHANGELOG is
  up-to-date. All user-facing changes should be reflected in this document.

[lemmih]

Can this background task be added to the services?

[hanabi1224]

Yes, but that will make its usage a bit complicated for other tools, e.g. statediff, forest-cli

[lemmih]

How about exposing the async loop and then letting the caller spawn a task? Or maybe just use std::thread::spawn.

[hanabi1224]

Fixed

[lemmih]

Thanks! Now I won't accidentally run the function from a non-async context. :)

[LesnyRumcajs]

I guess this may be helpful to track the daemonized process, but in general, for benchmark, I'd use /usr/bin/time -v. Application self-reporting memory metrics of itself is shady. I'm okay with merging this, though.

        Command being timed: "target/release/forest --chain calibnet"
        User time (seconds): 1.18
        System time (seconds): 0.57
        Percent of CPU this job got: 8%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:19.70
        Average shared text size (kbytes): 0
        Average unshared data size (kbytes): 0
        Average stack size (kbytes): 0
        Average total size (kbytes): 0
        Maximum resident set size (kbytes): 120804
        Average resident set size (kbytes): 0
        Major (requiring I/O) page faults: 32
        Minor (reclaiming a frame) page faults: 36876
        Voluntary context switches: 16040
        Involuntary context switches: 347
        Swaps: 0
        File system inputs: 900872
        File system outputs: 89856
        Socket messages sent: 0
        Socket messages received: 0
        Signals delivered: 0
        Page size (bytes): 4096
        Exit status: 0

[hanabi1224]

@LesnyRumcajs Thanks! That's a much better option, I kinda confused /usr/bin/time with time which does not support -v : )