massive CPU usage

[BloodyIron]

So I've been running tekkit for a handful of months, and we've had to troubleshoot performance many times. We've got a beastly system running it, and the last few days one of the cores is pinned by the primary java thread. Naturally our TPS has dropped to like 7. I check timings and nothing is shouting "fix me". I suspect an inefficient mod, but I am unsure how to isolated the cause.

 

I'm using spigot, with tekkit 1.2.9e.

 

How can I determine the cause? This started in the last 2-3 days, so I suspect someone built something nasty.

 

Tips?

[EvilOwl]

Opis or visualvm

[BloodyIron]

Can you elaborate on that please?

 

 

Opis or visualvm

[EvilOwl]

• Install opis + mobius core and run /opis as OP

or

• install jdk and download visualvm, run it and pin it to the server thread, go to the Sampler tab and push the CPU button

[BloodyIron]

Oh turns out a force field was going berzerk, yet I couldn't determine this from timings or other methods :/

[BloodyIron]

That Opis + Mobius looks neat, I'm going to read more on it now, thanks!

[EvilOwl]

Opis has a built-in map which can show the sources of block updates etc. this should pinpoint a force field gone wild.

[BloodyIron]

As a point of interest, I tried using Opis and Mobius 1.2.2 for 1.6.4, and I was getting crashing on server init, but when I switched to 1.2.1 all seemed to be well. This is more for other people to read.

[EvilOwl]

Care to share the crash log through pastebin? You fixed your issue by yourself so this is going to be out of curiosity.

 

 

 

Edit: Opis 1.2.2 needs MobiusCore 1.2.1 not 1.2.2 to work in 1.6.4 so the log will not be needed after all..

Edited October 11, 2014 by bochen415

[BloodyIron]

Oh okay, yeah it's probable that my crash was due to using MobiusCore 1.2.2 then. For now I'm going to stick to Opis 1.2.1 though as we have it working

 

Thanks for that tidbit though

[BloodyIron]

Hey so for Opis, to get the run functions and stuff in the GUI I need to add a player to the "privileged" list in opis, but this isn't how I want to handle permissions, we organize permissions through "bukkit" permission style. Granting groups access to specific things. For now I can use the privileged thing, but do you know of another way to do it? Also, without OP'ing people.

[EvilOwl]

Sorry. Mods often don't cooperate with plugins. Those two were only temporarily on my (small) server.

[BloodyIron]

I'm not sure how that's relevant, since there are already permission declarations for opis, except the 1.2.2 and 1.2.1 version still requires that privilege list in it's config, which is lame :/ no other idea how to do this?

 

 

Sorry. Mods often don't cooperate with plugins. Those two were only temporarily on my (small) server.