FTB Direwolf20 1.12 server can't keep up problem

@Xeni91 wrote:

Hello guys,

We now host (or at least try to) our own Direwolf20 1.12 server.
We just started out 2 Days ago and installed v2.4 for it.

Our server Specs are:

10 vCores
16 GB Ram
750 GB

OS is: Ubuntu 18.04

java version:

openjdk version “1.8.0_191”
OpenJDK Runtime Environment (build 1.8.0_191-8u191-b12-0ubuntu0.18.04.1-b12)
OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode)

That comes directly from our hoster.
But the problem ist that the server does not work properly. Even with just one person in the . game, the game laggs like hell so Skipping like tons of ticks.

[08:34:45] [Server thread/WARN] [minecraft/MinecraftServer]: Can’t keep up! Did the system time change, or is the server overloaded? Running 6199ms behind, skipping 123 tick(s)
[08:39:47] [Server thread/WARN] [minecraft/MinecraftServer]: Can’t keep up! Did the system time change, or is the server overloaded? Running 3158ms behind, skipping 63 tick(s)

We don’t have a hug playerbase just above 8 Players or so.

I fiddled with some of the parameters of Java but it does not seem to work.

I added to the startup script as follows:
ServerStart.sh

start_server() {
“$JAVACMD” -server -Xms${MAX_RAM} -Xmx${MAX_RAM} ${JAVA_PARAMETERS} -jar ${FORGEJAR} nogui
}

Also I edited the settings.sh:

export MAX_RAM=“14G” # -Xmx

The server runs not in docker since our hoster does not allow docker on his virtual maschines.
To run the server I use a detached shell with “tmux”.

Since I am only a measly webdev and don’t have any experience with Java at all I just want to let my guys have a nice experience with minecraft.
So I need your help to stabilise the server so it is playable. I understand that with tech advancemend the server is bound to lagg but since we just started out and the server did lagg even with nothing on it I can’t seem to find the mistake.

Thanks in Advance fellow admins and or devs, I appreciate the help.

Best Regards
Xeni91

P.S.: Oh here is our latest crash report:
https://paste.feed-the-beast.com/view/f57bb1a7

Edit1: changed categories to Server issue
Edit2: Oh, to mention even though I say he should use 14G or RAM he only uses 7

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