Prominence II Server Performance Issues

[sly lagoon]

Hi, my server is running Prominence II and right now we are crashing after around 20 minutes with 8+ people on the server. TPS performance is okay. Around 13-16 with 8 people on again. Ideally I would like it to be lower but there we are. Chunks are loaded out to my world border (2500 blocks each way) as well as in the nether, though no one has got to any other dimension yet.

My server is running on pterodactyl with access to 16 threads from my Intel(R) Xeon(R) Gold 6134 CPU @ 3.20GHz. The box itself is running on Ubuntu 22.04.5 LTS.

I am using GraalVM CE 22.0.2+9.1 as well.

My startup flags are these, where server memory = 32768 and cutdown = 2500 java -Xms$(({{SERVER_MEMORY}} - ({{CUTDOWN}})))M -Xmx$(({{SERVER_MEMORY}} - ({{CUTDOWN}})))M -XX:+UseG1GC -XX:MaxGCPauseMillis=130 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=28 -XX:G1HeapRegionSize=16M -XX:G1ReservePercent=20 -XX:G1MixedGCCountTarget=3 -XX:InitiatingHeapOccupancyPercent=10 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=0 -XX:SurvivorRatio=32 -XX:MaxTenuringThreshold=1 -XX:G1SATBBufferEnqueueingThresholdPercent=30 -XX:G1ConcMarkStepDurationMillis=5 -XX:G1ConcRSHotCardLimit=16 -XX:G1ConcRefinementServiceIntervalMillis=150 -jar {{SERVER_JARFILE}} --nogui

I have a couple performance/fix mods I added to the server which are: vmp and mc249136.

I have also removed Neruina as it has caused a lot of issues for me previously

This is my most recent crash file.

While I'm aware this may not be the place to post this(?) I am hoping that someone with experience hosting this modpack is able to help out.

[static veldt]

Uploaded hs_err_pid39.log from @sly lagoon to mclogs: https://mclo.gs/SCFIPy9

:warning: This is a hs_err_pid file.
These files may contain personal information such as your session token.
Mclogs automatically censors these files, so you should delete your original attachment now.

[sly lagoon]

Reverted to GraalVM CE 21 and testing now.

[sly lagoon]

Crashed again, new error log

https://mclo.gs/omx5ORo

[vagrant portal]

do not use VMP

it will cause issues

especially do not remove Neruina

and MC-249136 is already fixed by several other mods

you really do not need to add or remove anything lol

our packs are fully optimized

[sly lagoon]

Alright I'll try.

[vagrant portal]

please revert your changes and see if the issue persists

[sly lagoon]

Reverted changes. We are testing again.

[sly lagoon]

TPS has now gone down drastically. 3 players on and it is at 13. Unsure if this is normal.

Crashed almost immediately after I ran the profiler.

[vagrant portal]

i see no reason that'd happen lol, neruina doesnt actually add any server load

it just takes responsibility for anything involving entities

[sly lagoon]

Strange

[vagrant portal]

and VMP wouldnt affect anything at 3 players

[sly lagoon]

well I did remove it

but we had much more players when I did have it

oh you mean. mb

misread it.

[sly lagoon]

Any idea why it would be doing this?

[vagrant portal]

send a profiler link

[sly lagoon]

https://spark.lucko.me/BaIIJwy13v

https://mclo.gs/JvQElqB

here's the latest crash log too

[vagrant portal]

im pretty sure its your java args crashing you

!tps follow the args guide in here instead

[kindred oxide]

Please follow the guide here for changing the Java version your server uses. This will improve performance dramatically. If you are on a third party server host, you likely can not change the Java version your server uses. Bisect Hosting and a few VPS providers do allow changing Java version, though, which can usually be done through your server dashboard.

The method on Bisect is to simply go to the main dashboard page, and select "GraalVM 22" as the Java distribution. If it crashes, use 21 instead.

For further performance improvements, you can also follow this guide.

Reducing server render distance in the server.properties file is also a very good way of reducing lag. Most of our modpacks include mods like Bobby and Farsight, which make it so reducing server render distance will not affect players.

If lag persists, run the following command ingame:
/spark profiler start --only-ticks-over 50
Then, send the link in this channel.

[sly lagoon]

Will do

I assume I only want the G1GC flags in this guide https://github.com/Mukul1127/Minecraft-Java-Flags ? I'll also go back to using GraalVM 22

[sly lagoon]

@vagrant portal

[vagrant portal]

yeah the g1gc flags are fine, you can also try one of the other garbage collectors

[sly lagoon]

Alright. I'll add -jar too obviously.

Crashes while loading, here is the log file.

https://mclo.gs/tiFleCX

May be because I moved back to Graal 22. But just to make sure are you able to double check my flags are correctly inputted, I may just be doing something stupid and not realising 😅

java -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+AlwaysActAsServerClassMachine -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:NmethodSweepActivity=1 -XX:ReservedCodeCacheSize=400M -XX:NonNMethodCodeHeapSize=12M -XX:ProfiledCodeHeapSize=194M -XX:NonProfiledCodeHeapSize=194M -XX:-DontCompileHugeMethods -XX:+PerfDisableSharedMem -XX:+UseFastUnorderedTimeStamps -XX:+UseCriticalJavaThreadPriority -XX:+EagerJVMCI -XX:+UseG1GC -XX:MaxGCPauseMillis=130 -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=28 -XX:G1HeapRegionSize=16M -XX:G1ReservePercent=20 -XX:G1MixedGCCountTarget=3 -XX:InitiatingHeapOccupancyPercent=10 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=0 -XX:SurvivorRatio=32 -XX:MaxTenuringThreshold=1 -XX:G1SATBBufferEnqueueingThresholdPercent=30 -XX:G1ConcMarkStepDurationMillis=5.0 -XX:G1ConcRefinementServiceIntervalMillis=150 -XX:G1ConcRSHotCardLimit=16 -XX:AllocatePrefetchStyle=3 -jar {{SERVER_JARFILE}} --nogui

[abstract solstice]

does 21 also crash while loading

[sly lagoon]

I'll test.

btw so you know I am using this for Graal https://github.com/RikoDEV/pterodactyl-graalvm

[vagrant portal]

"-jar {{SERVER_JARFILE}}"

you need to specify your server jarfile there

i think

idk

i dont even know what the point of that arg is lol

[sly lagoon]

Ah dont worry about that, pterodactyl things.

[vagrant portal]

ah

[sly lagoon]

It just sets it to whatever I named it in ptero

[sly lagoon]

Starts up fine btw. Multitasking a little bit with uni work rn sorry for delay 😅

TPS looking good so far. Though only 3 people on rn.

[sly lagoon]

5 people on TPS sitting around 16-17

Neruina is still appearing to use 48% of the server thread in spark rn

https://spark.lucko.me/6ABXfYUrIe

[vagrant portal]

once again, its not actually causing any lag

if you were to remove it, it'd just be something else at 48%

[sly lagoon]

yeah think its just appearing to

[sly lagoon]

I mean when i removed it nothing showed appearing at 48% but yeah

or anything close

[vagrant portal]

ok then you're free to remove it lol

[sly lagoon]

Yeah TPS reduced to 10 at 7 people and server just crashed. Crashed my entire box not just minecraft which is slightly horrifying.

[sly lagoon]

TPS is still 10 with 7 people on. After removing (to double check) nothing else is close to what it was supposedly taking up however there is very little performance change.

https://spark.lucko.me/SpxtWt3mwB

Could be because I didnt allocate memory within the startup args?

[vagrant portal]

i'm pretty sure you're just being limited by your CPU here

you have a CPU meant for multi-core performance

minecraft is single-core performance

[sly lagoon]

ah damn.

well that fucking sucks.

[sly lagoon]

What would you say to aim for cpu stats/performance wise. May be able to work something out

[past drift]

Neurina likes to take the blame for issues, when it’s trying to prevent crashing issues.

[sly lagoon]

I see.

[wide marlin]

Did you lower simulation distance yet in server.properties for example simulation-distance=3
Since you have lots of memory try zgc garbage collector, its better for latge heap, example you can try just use this
-XX:+UseZGC XX:+UseDynamicNumberOfGCThreads

[sly lagoon]

indeed

its sitting at around 4 rn I believe

[karmic tusk]

Hey guys, can someone help me figure out how to run an already created local server with a different version of Java? In this case, I want it to run with GraavalVM Java. It's currently running with a different version of Java. The server is running on my PC. I'm following the steps, but the start.bat file doesn't mention any Java execution function to change the Graaval path, or where in the file I should change the path. Your support would be greatly appreciated. Thank you very much!

[vagrant portal]

why are you asking in this thread

please go to the modpack channel

[karmic tusk]

Sorry, I noticed you were talking about this topic here before so I thought this would be the right channel, thank you very much,

[small fox]

Prominence II RPG - v3.1.6 crashed. The logs have been uploaded to mclo.gs:

1. 1.20.1, Prominence II RPG
2. What launcher did you run Minecraft with? (e.g. CurseForge, ATLauncher, MultiMC, ...)
3. Have you changed the modpack in any way except mods?
4. v3.1.6
5. Have you ever gotten past the crash condition without crashing, or does the game always crash?
6. What steps cause the crash?
   latest.log
   crash-2025-03-18_15.26.22-client.txt
   CurseForge: launcher_log.txt

Mod list changes beyond the modpack:
The mod list diff was uploaded.
What is the issue?

[sly lagoon]

wrong place to post ! I would have to bet that it is because you changed the mod list so heavily though.

[small fox]

They said me that i must the post here....

[sly lagoon]

i think they perhaps said to make a new thread. But fr I would try not changing the modpack so much.