Feature request: Memory usage

[Floppy]

Have you considered tracking memory usage over time? Having a graph of that would be amazing for debugging performance issues like memory leaks!

[igorkasyanchuk]

Good idea, perhaps me, you or someone can do it

[igorkasyanchuk]

but it can be a bit tricky if we consider multiple instances that can be running, also how to collect info when we don't have any requests (some thread/workers started?)

if someone decide to work on it I'm ready to talk and discuss possible solution.

[Floppy]

Looks like https://github.com/zombocom/get_process_mem provides an easy way to get the memory usage of the current process; perhaps a minimal version of this could be to store the usage along with each request or sidekiq job. It would then need multiple lines on the graph, one for each process, I guess.

If that works, then a follow up could be to look at adding a monitoring thread for regular measurements, perhaps.

[Floppy]

Actually, presumably I could work out if this is viable using custom_data_proc before forking and digging into the code proper... I'll have a go.

[Floppy]

So, this code is happily grabbing the PID and memory usage on each request:

config.custom_data_proc = proc do |env|
  {
    pid: Process.pid,
    memory_usage: GetProcessMem.new.bytes
  }
end

And I can see it in the UI:

So, now I need to work out how to add a graph.