Insane Non stop block and server lag!

[venombite12]

Hello, for the last day or so ive been having insane server lag, here is my most recent server log - http://pastebin.com/mQ5weydB

thanks

 

[Ashzification]

What is the server running on, and how much RAM is allocated to it?

 

[venombite12]

What is the server running on, and how much RAM is allocated to it?

6 gigs nvm btw, it was over 10,000 wither skeles in a 3x3 area XD

 

[Ashzification]

6 gigs nvm btw, it was over 10,000 wither skeles in a 3x3 area XD

That'll do it!

 

[ZtH]

I do have the exact same problem, but with a newly created world.
Sysspecs are:
ESXi virtualized environment. Physical specs: 8x Cores (2x Xeon E5602), 24Gb RAM.
Virtual server for MC: 4x cores, 12Gb RAM, Ubuntu Linux x64 (Java heap size 8G max, 4G min), running MC from ramdisk. Pack is Direwolf20.
Current online count is eight players, but I already have 300+ ms in a tick rate delay (using /TPS command). Using ForgeTools "/mobs d" I see - I have 5000+ passive mobs spawned, but I have no idea is it the case, or something else.
"top" command give me approximately "1.20" state, 80% CPU idle (0 - 0.5% wait), 15-20% of RAM free, no swapping.
"java" process using about 130% of CPU, about 15% of memory.
So I just can't think of anything trying to find a source of lag... Could you advise me something pretty please?

 

[Eyamaz]

130% of your cpu is impressive. I've never been able to go over 100% myself.

Anyway.

Kill the mobs. Try to keep your entity count bellow 1000. (below 500 truely)

 

[ZtH]

130% means it's using one whole core plus a little extra from another (that's how linux represents actual cpu usage =)
I would gladly kill all the mobs, but how can I find them? It's a newly created world, and I have no idea where to search...

 

[Eyamaz]

Oh, that's a world mob count, not area. Sorry.

Can you follow the first two links in my signature please?

 

[ZtH]

Ok, just in case I reinstalled java, and populated server mc dir with freshly unzipped ftbserver.jar and mods.

Here's server.log file: http://pastebin.com/VKE0PsAw - I cutted the log because of "Can't keep up! Did the system time change, or is the server overloaded?" is all that follows there.

 

[Nessiroj]

are you sending any java flags during the startup of the server (ea in the file you launch)?

 

[ZtH]

I definitely do... Here they are:
java -Xmx8192M -Xms4096M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalPacing -XXarallelGCThreads=4 -XX:+AggressiveOpts -jar ftbserver.jar

 

[Nessiroj]

Might be worth a shot:
As stated by CPW on twitter to me:

NO. Set (x)ms == (x)mx, for servers, ALWAYS.

This will reduce lag by a big amount, since the server won't be trying to clear the ram it uses above the xms value

 

[ZtH]

I will absolutely try it. Thanks!

 

[ZtH]

Ok, it seems to be helpful a little, at least now I have acceptable 20-40ms delay, but I have to do restarts on a regular basis (it seems to me - mobs are spawning on a newly created chunks, and they dont bother about despawning themselves).
Thanks anyway, guys! I can live with that!