Suddenly high CPU usage of the server?

[danger89]

Hi,

I got a big problem. Suddenly my servers->both takes (random?) at lot of CPU usage!

The server has a tripple core 2,7GHz AMD processor but the server takes 20% CPU with only 2 players......

3 days ago armagetronad-dedicated was using 100% CPU!

I didn't changed anything in the config files and did not else?

What to do? Somebody know this problem? If this isn't solved quick enough I will close all my Wildcat servers, it's ruining my complete server.

If I remember it right, before it was always 1% maybe 2% or 3% CPU, not really much more.

Ps.
Armagetron server reboot didn't solve the issue.

Kind regards,
Melroy

[Tank Program]

Can't say I remember a particular instance of this happening before. Maybe a debug recording? Look at what files it's got open with lsof? Check out netstat?

[danger89]

Ok, how do I start recording debugging? And what is netstat?

[Z-Man]

Ok, how do I start recording debugging?

You pass the extra command line argument "--record highcpuusage.aarec" to the main armagetronad executable. How are you starting the servers right now?

And what is netstat?

A program telling you which program has network connections open with what. Dunno how it can be useful here.

[Tank Program]

Well I'll admit netstat is a bit of a long shot, but if the server's getting flooded over the network causing high CPU usage, it'd give some indication maybe.

[danger89]

Ok, I have some information except the debugging record (I will do that as soon as possible!).

LSof:
http://pastebin.com/rJmKzQb9

Start-up script (shell):
http://pastebin.com/vae80T4s

IPTraf monitor tool (log file):
http://pastebin.com/Kf0wAzDG (will be destroyed after 1 month)
(6 player of Armagetron active)
NOTE:
I also run a Call of Duty 4 server (5 players active) & MySQL server at the same server as Armagetron, just that you know.

Ignore port 28960, 28961, 28962 & 3306.

Netstat:
http://pastebin.com/jQVAU2j8

Var directory:
http://pastebin.com/70y1dKxL

Note:
It seems if the server is empty the CPU usage will go drastic down.

[kyle]

also what version of armagetron are you using?

[danger89]

also what version of armagetron are you using?

armagetronad-0.2.8.3.1 met ZThread-2.3.2 configured.

Note: the server worked well for a long time, but just suddenly about 1 week ago it went wrong

[Tank Program]

Another question then. What changed 1 week ago? Software upgrades? Some other sort of system or configuration change?

[danger89]

Thats the problem, nothing as far as i know.
EDIT:
The only what I can think of is I added 1 user via USER_LEVEL blabla@forums 2. But that is not related to this problem I guess.

[danger89]

OK I got the debug recording. I joined the server (so 1 player) and watched via htop command it says the server has 25% CPU usage.

Please download the recording debug log file here:
http://www.joinmyserver.com/library/dow ... sage.aarec

With zero players it's near 0% CPU usage.

[Z-Man]

Without actually playing it back, here's one sticky bit from your config:

Code: Select all

DEDICATED_FPS 500

That one lets the server run the simulation loop 500 times per second. First thing I'd do is try and reduce that, there shouldn't be any ill effects.

[danger89]

Without actually playing it back, here's one sticky bit from your config:

Code: Select all

DEDICATED_FPS 500

That one lets the server run the simulation loop 500 times per second. First thing I'd do is try and reduce that, there shouldn't be any ill effects.

As you can see in the same log file above I set it to 40 FPS.

CONFIG LDEDICATED_FPS 40 # maximum simulation steps per second the dedicated server will perform

CONFIG LDEDICATED_FPS_IDLE_FACTOR 2.0 # number of times per frame the server should check whether simulation can be done if no network input is coming

[Z-Man]

Yes, but there's a line later somewhere that sets it to 500, overriding the previous setting. And nothing after that.

[danger89]

Yes, but I dont set the second one. I cant find it in any cfg file.