I have just started performance testing for mozart (BPM platform) and I am seeing something I don’t understand and am hoping to get some advice. I have a GenServer module named ProcessEngine. Instances of this module are spawned via a DynamicSupervisor. Each ProcessEngine instance spawned is initi…

Good question, but sorry. How do I determine this? I don’t see this info available in the observer app.

Can you show your “run n times” function?

Sure, this file: https://github.com/CharlesIrvineKC/mozart/blob/main/lib/mozart/performance/demo.ex the last function in the file. If anyone cares to run these tests themselves, it wouldn’t require too much work: Clone the repo: https://github.com/CharlesIrvineKC/mozart get deps and compile iex…

One thing that doesn’t look right in the observer System panel is the “Run Queue”. It stays consistently at 2. I would think it would go higher.

I discovered that each GenServer was getting shutdown after about one half of a millisecond. I increased the alive time of the GenServer to several seconds. When I did this, all 12 of the schedulers became utilized. I don’t understand this completely, but it kind of makes sense. So, that was one iss…

One thing that’s not helping concurrency: doing work in init means that start_link takes longer to return. Consider moving the code from ProcessEngine.init to a handle_continue callback. Another thing that isn’t helping concurrency: init and execute both need to make calls to singleton processes (P…

@al2o3cr Oh Wow. That is very helpful. I appreciate your effort. I’ll get back to you. Thanks

One thing that’s not helping concurrency: doing work in init means that start_link takes longer to return. Consider moving the code from ProcessEngine.init to a handle_continue callback. I did that. Another thing that isn’t helping concurrency: init and execute both need to make calls to single…

[image] CharlesIrvine: What you say is true, but why is making calls to those servers an issue? Because every OTP process processes messages one by one. If you have 100+ processes each wanting something from that “central” process then that’s an obvious and very major bottleneck.

Elixir Programming Language Forum

Need some advice for Mozart performance testing

Questions & Help Questions

dimitarvp May 26, 2024, 3:10pm 2

Are your GenServers CPU-bound?