Spontanious crash. Cannot track source of issue. Lag?

Problem: A spontaneous crash, I suspect this happened once before.
When did this occur: I was watching my brother go on the server, it gave a read error, he tried reconnecting, and it didn't work. My guess is that it shut down due to to much lag.

What's odd is this server is fine for a small server, one person was on, doing nothing out of the ordinary. I started my VPS this morning. The server has 3gb of guaranteed ram and 5gb burstable and a quad core processor. I see no reason why it crashes.

Clues: Despite it being a good VPS and server, it gives me an error every 5 to 10 seconds, even when nobody was on:

Code:

2011-09-13 23:41:57 [WARNING] Can't keep up! Did the system time change, or is the server overloaded?

I suspect this was due to the server being overloaded. I don't know why it would be though, it has enough power under the hood. Could it be a faulty plugin?

1. What OS are you using (Brand and version - Ex. Windows XP SP3)?: Linux. More specifically CentOS 5. x86_64
2. What architecture is the OS you are running (x64 or x86)?: As stated above x86_64 (x64)
3. What version and architecture is your java install?:

Code:

java version "1.6.0_20" OpenJDK Runtime Environment (IcedTea6 1.9.8) (rhel-1.22.1.9.8.el5_6-i386) OpenJDK Server VM (build 19.0-b09, mixed mode)

4. Are you running any wrappers? McMyAdmin, mcadmin, Hamachi, etc?: Nope.
5. What build of CraftBukkit are you running?: 1060
6. What command are you using to run your CraftBukkit server?: java -jar server.jar
7. What plugins are you running?:

Code:

18:30:53 [INFO] Plugins: WorldGuard, PermissionsEx, ChatManager, CraftBookCommon, mcbans, WorldEdit, Permissions, Multiverse-Core, BlockLog, CraftBookCircuits, Multiverse-NetherPortals, DropChest, Spout, CraftBookMechanisms, CraftBookVehicles, Honeypot, Modifyworld, TntMiner, MiningTNT, CommandBook, iConomy, Multiverse-Portals

8. What error are you getting (post your server.log file)?: Just "shutting down" and the other one I posted above.
9. What have you tried already?: I don't know what plugin might be causing this, so I'm at a loss of what it could be. Is there a particularly ram expensive plugin I'm using?

Thanks,
Dragos240

 

Whoa, you read the big red post!! *dies*

As for the cant keep up message, your not going to be able to stop it unless you can replace the hard drive on the VPS with a SSD. Its something you will have to get used to, it is mostly caused because minecraft servers require a huge amount of I/O

As for the other error, I am unsure based on the information >.<

 

Ah. I see.. That's too bad. And yes, I read that post. At least I know why the server is displaying that, as for it's crashing issue. I only wish I knew where to start..

 

i think it is becous you start your server with "java -jar server.jar" that meens you dont assign ram to the server
i think the standaard value of ram is 512M.

maby you can try to start it wich

Code:

java -Xincgc -Xmx2G -jar craftbukkit-0.0.1-SNAPSHOT.jar

 

Oh. Well if that's the case, the command is now:
java -Xincgc -Xmx2256M -jar server.jar

The reason for the exact number is it's the highest it allows

 

oke did it help?

 

Not sure. The crash is usually after 6 hours or so.

Alright. It's been up significantly longer than it has before. It is not crashing either. The one problem remains. How can I take advantage of my burstable ram....? *uses search function*

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Install 64bit Java to get >2GB RAM.

One thing I found was if people were stupid distances away (1m blocks+, I think) the server can't handle it and gives off a ton of read errors whenever they try to connect. Only fix was to delete their player.dat :/