MC server lagging but server resources not being fully utilized.

[Foxface918]

Hi,

I'm trying to run a Minecraft server on my server but I keep having lag backs, block lag and chunks not loading. The resources that I allocated do not seem to be being used. I am running 2 Xeon x5650 32 GB of ram (only 15 GB is allocated to the sever but it is only using 5 GB) and a 300 Mbps up and down internet connection with 3 ping. The server is vanilla. 10 ish people play on the server but it lags with as little as 2 people on at a time.

This is the stat.bat script that I am using.

java -jar -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSIncrementalPacing -XX:ParallelGCThreads=7 -XX:+AggressiveOpts -Xms5G -Xmx15G -jar server.jar
pause

The notification that I get when it lags:

Can't keep up! Is the server overloaded? Running 4109ms or 82 ticks behind
and 
Boat (vehicle of <Player>) moved too quickly!

T

[svmlegacy]

Try dropping XMS down to 512M or so. Too big causes issues, and realistically it'll allocate more ram as is needed.

[manikyath]

5 minutes ago, Foxface918 said:

I am running 2 Xeon x5650

of which all but the handling of network traffic is in one thread. (and maybe terrain gen, i'm not sure how much of that is split off too)

but essentially any world changes (breaking and placing blocks), all creatures' AI, redstone ticks, all movement, etc. is handled in a single thread.

having that said.. vanilla shouldnt be lagging to shreds, even on that processor... are you sure it's entirely vanilla? or is this bukkit with a bunch of plugins piled in?

[Electronics Wizardy]

THat 4% cpu usage is basically the full usage of one thread. I think linux handles this a bit better, so maybe give linux a shot, but these are some old chips.

[Foxface918]

1 minute ago, manikyath said:

of which all but the handling of network traffic is in one thread. (and maybe terrain gen, i'm not sure how much of that is split off too)

but essentially any world changes (breaking and placing blocks), all creatures' AI, redstone ticks, all movement, etc. is handled in a single thread.

having that said.. vanilla shouldnt be lagging to shreds, even on that processor... are you sure it's entirely vanilla? or is this bukkit with a bunch of plugins piled in?

It is the new 21w06a. There should not be any thing else. I have the same issue with a 1.16.5 server too.

[WhitetailAni]

Vanilla Java MC servers use 1, maybe 2, cores.

Having 2 CPUs won't help much.

Disabling all but 2-4 cores on each CPU, then overclocking the 2 CPUs would probably help the most. I certainly noticed a difference between 3.2 GHz and 3.95 GHz on my Phenom II X4 955.

[manikyath]

1 minute ago, Foxface918 said:

It is the new 21w06a. There should not be any thing else. I have the same issue with a 1.16.5 server too.

what's the load like on a completely fresh, empty world?

 

also, for vanilla you're WAY overallocating your memory, i generally leave out -Xms all together, and for vanilla with a small player count i'd say 4GB will be plenty.

[kelvinhall05]

No idea why you have so many flags in your start file, but I'll assume you have legitimate reasons for them.

 

 

MC servers only run on one thread so it's not surprising that 23 of your threads aren't being used. I would also switch to a Paper server instead of the official one.

[Foxface918]

1 minute ago, manikyath said:

what's the load like on a completely fresh, empty world?

 

also, for vanilla you're WAY overallocating your memory, i generally leave out -Xms all together, and for vanilla with a small player count i'd say 4GB will be plenty.

This is on a brand new world same issues. I just changed the -Xms 512M.

[manikyath]

Just now, Foxface918 said:

This is on a brand new world same issues. I just changed the -Xms 512M.

what happens if you cut out all the command line arguments aside from -Xmx4G?

[Foxface918]

4 minutes ago, kelvinhall05 said:

No idea why you have so many flags in your start file, but I'll assume you have legitimate reasons for them.

 

 

MC servers only run on one thread so it's not surprising that 23 of your threads aren't being used. I would also switch to a Paper server instead of the official one.

The arguments are my attempt to spread the load across threads. 

[Foxface918]

11 minutes ago, manikyath said:

what happens if you cut out all the command line arguments aside from -Xmx4G?

It might be a little better but still laggy.

[kelvinhall05]

16 minutes ago, Foxface918 said:

The arguments are my attempt to spread the load across threads. 

No offense but if multithreading an MC server was that simple then all the large ones with tens of thousands of players would be doing it...

 

 

Remove all but your min and max RAM limits, lower your minimum to 1024M/1G, and your server should run better. Then switch to Paper because the official server is trash, and it'll run even better.

[Foxface918]

Just now, kelvinhall05 said:

No offense but if multithreading an MC server was that simple then all the large ones with tens of thousands of players would be doing it...

 

 

Remove all but your min and max RAM limits, lower your minimum to 1024M/1G, and your server should run better. Then switch to Paper because the official server is trash, and it'll run even better.

Yeah I know that didn't really work but it was worth a shot. I don't think there is a paper version for 21w06a yet.

[manikyath]

5 minutes ago, kelvinhall05 said:

Then switch to Paper because the official server is trash, and it'll run even better.

a plain empty vanilla server shouldnt be filling an entire core, even of a very poor hardware pick like this one.. 

[Foxface918]

2 minutes ago, manikyath said:

a plain empty vanilla server shouldnt be filling an entire core, even of a very poor hardware pick like this one.. 

I have another system with a Phenom II X4 of some kind but only 8Gb of ram. Would that be better?