Problem Server Problems | 1.1.2 Ultimate | Unreal Lag |

[Davehkiin]

Hey guys. Hosting a private server for around 2-8 people at any one time, this isn't a lot of people. i can host up to 60 people on the same machine running bukkit.

Problem: Unreal lag spikes

• What OS are you running?
  Windows 7 Ultimate x64

• Are you using minecraft hosting provider or a dedicated/local server not designed for minecraft?
  Self Hosted Server
  
• What version of FTB are you using? (Dont just say latest tell us the version)
  (FTB Launch starting up (Version 1.2.4))
  Using mod pack FTB Ultimate 1.1.2
  
• Did you add any mods to the server pack?
  No, but i removed Mystcraft from the SERVER files.
  
• What are your server specs?
  The server is running on 8GB Ram
  4GHz Overlocked AMD 965 Quad Core.
  6870 Graphics
  
• A good detailed paragraph about the problem
  Really i cannot give much detail, however watching the server console i can see the spikes going right to the top being a solid red bar, there should be no reason for this. We started a new map on an agreement to try fix out the lag, and should we find what items are causing it remove them or something. Howwever out of nowhere the server is deciding to lag. It lags hard and even drops framerate (for me from about 60 to about 15-25).

Any help would be greatly appreciated
-dave

 

[Mr Chris]

A clean server log (delete the current log, start up the server and let it run for about 10 minutes with people on) would help greatly, could you upload one please?

 

[DZCreeper]

What kind of startup script are you using for the server? Please copy and paste the exact contents. I suspect it might be garbage collection or orphan chunks being unloaded and loaded rapidly. Looking at the script will point us in the right direction.

Here is an excellent, very stable tool written by Nallar of Tick Threading: http://www.reddit.com/r/mindcrack/comments/1f7vqi/introducing_tickprofiler_a_bit_late_but_better/

It should help with finding the lag source, I haven't personally used it, but it should be of high quality.

 

[Davehkiin]

This is my Batch to run:

java -Xms512M -Xmx5G -jar ftbserver.jar

And my log is here:

http://pastebin.com/kQSeC5JB

This is actually the log since i redone the server, after removing mystcraft mod. Meaning... There's a lot of stupid chat lines, but it's easy enough to ignore. Hopefully it should give insight, cheers.

 

[DZCreeper]

When you say top of the red bar, do you mean memory usage or cpu usage?

Try this startup file: java -server -Xms5G -Xmx5G -jar ftbserver.jar nogui

 

[Davehkiin]

When you say top of the red bar, do you mean memory usage or cpu usage?

Try this startup file: java -server -Xms5G -Xmx5G -jar ftbserver.jar nogui

Yeah i'm unsure what that usage bar is. But it goes to the top during the lag spike, and usually slimlines it until we bump into the wierd lag.

I never actually thought of dedicating 5gb at all times rather than telling it to use anywhere in between.

I'll do it later tonight, i'll report back at 7pm