As per the sticky to ask tech support I'll fill out the questions
- What OS are you running?
Ubuntu server 13.10 64 bit - Are you using minecraft hosting provider or a dedicated/local server not designed for minecraft?
Dedicated server - What version of FTB are you using? (Dont just say latest tell us the version)
Minecraft version 1.6.4 and Forge version 9.11.1.965 - Did you add any mods to the server pack?
Using dw20 1.6.4 pack with about 5 extra mods added. Dartcraft, Mekanism, chisel, carpenter blocks and a couple others. - What are your server specs?
CPU: Intel Xeon E3 1245v2
RAM: 32 GB
2TB of storage
200mbps bandwith - A good detailed paragraph about the problem
So my friends and I have been playing on a server that I set up for us and for the past week we've been having an immense amount of lag when we were all online. At the time, we were using another dedicated server with a dual core i3 and 8GB ofRAM. We upgraded to the current server because we got some new players and more activity in general. At the moment we have 5-10 players playing at once. The problem is, after moving to this new server, the lag has gotten worse. The game becomes unplayable because everyone on the server is lagging so badly. I've run Opis and frequently check the tps on the server using /forge tps and the tps isnt anywhere near high enough to warrant this kind of lag. Here is a /forge tps I just took right now while I was writing this post.
2014-03-22 23:23:37 [INFO] [Minecraft-Server] Dim 7 : Mean tick time: 3.647 ms. Mean TPS: 20.000
2014-03-22 23:23:37 [INFO] [Minecraft-Server] Dim -31 : Mean tick time: 0.034 ms. Mean TPS: 20.000
2014-03-22 23:23:37 [INFO] [Minecraft-Server] Dim -1 : Mean tick time: 2.316 ms. Mean TPS: 20.000
2014-03-22 23:23:37 [INFO] [Minecraft-Server] Dim 0 : Mean tick time: 32.677 ms. Mean TPS: 20.000
2014-03-22 23:23:37 [INFO] [Minecraft-Server] Overall : Mean tick time: 36.341 ms. Mean TPS: 20.000
This was taken while players are online and going about their normal Minecraft lives. Even though the tps isn't anywhere near insane, the amount of lag on the server is very high. Another strange occurrence is that the server console is constantly being spammed by ic2 errors. Sometimes its just one, but other times its a hug wall of text in IC2 errors. Ill pastebin the wall of text here.
pastebinned wall of text errors: http://pastebin.com/d78nMCFp
Here is an example of one of the single line errors that show up on the console every few minutes
2014-03-22 23:39:48 [WARNING] [IC2] EnergyNet.removeTileEntity: mekanism.common.tile.TileEntityLogisticalSorter@2aed0b68 (mekanism.common.tile.TileEntityLogisticalSorter@2aed0b68) wasn't found (added), skipping
Apart from those two types of errors, the server is spitting out this message every few seconds
2014-03-22 23:40:43 [WARNING] [Minecraft-Server] Can't keep up! Did the system time change, or is the server overloaded?
I know this message is common and its generally not something to be alarmed by; especially with several moving players throughout the world, but I cant help but think it might be a problem when it's appearing every couple seconds, even after upgrading to this better server.
I apologize for the wordy post, but I've tried to be as thorough as possible in hopes that it will help someone identify any issues that might be occurring. Thank you.
ermSize=256m -XX:NewRatio=3 -XX:SurvivorRatio=3 -XX:TargetSurvivorRatio=80 -XX:MaxTenuringThreshold=8 -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:MaxGCPauseMillis=10 -XX:GCPauseIntervalMillis=50 -XX:MaxGCMinorPauseMillis=7 -XX:+ExplicitGCInvokesConcurrent -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=60 -XX:+BindGCTaskThreadsToCPUs -Xnoclassgc