Admincraft•7mo ago

Help diagnosing lag in modded

ello! I am running a modded skyblock server (forge) on a cheap ass vps. Specs: AMD EPYC 7401P, 16 gb ram, 3 threads The server runs perfectly fine at 20 tps in skyblock, but the moment someone enters the nether the tps drops to 5-10 It is probably because of the cpu since it is a cheap vps, I have plenty of ram so that is not an issue Can someone please check if this is just cpu or any mod or something? Is there any way I can reduce this lag, whether by removing a mod, changing config or any way that doesnt involve upgrading server since I cant afford that atm... Spark: https://spark.lucko.me/Jt2D0PSa4L Btw the modpack is a customised version of "Fantasy Skies" with extra mods added

spark

spark is a performance profiler for Minecraft clients, servers, and proxies.

72 Replies

Admincraft Meta•7mo ago

Thanks for asking your question!

Make sure to provide as much helpful information as possible such as logs/what you tried and what your exact issue is

Make sure to mark solved when issue is solved!!!

/close !close !solved !answered

Requested by primordial9470#0

Admincraft Meta•7mo ago

Spark Profile Analysis

❌ Processing Error

The bot cannot process this Spark profile. It appears that the platform is not supported for analysis. Platform: Forge

Requested by primordial9470#0

Jt2D0PSa4L.sparkprof...

Skullians•7mo ago

1. that CPU is awful for mc. consider making a post in #marketplace 2. do you have any command blocks or datapacks

PrimordialOP•7mo ago

no datapacks, just a lot of mods i cant afford any of the hostings in marketplace atm unfortunately, is there any humanly possible way to reduce the lag?

Skullians•7mo ago

use the /perf command

https://docs.bloom.host/datapacks/#disclaimer + https://misode.github.io/report/ canned message for people to use these to diagnose command function lag/identifying lagging datapacks (can also mention https://minecraft.wiki/w/Commands/perf, but thats more for the command and not actual diagnosing from it)

PrimordialOP•7mo ago

imma try that out, ty 😅

Admincraft Meta•7mo ago

For safety reasons we do not allow executables to be sent as they might contain malware. If you're compiling for someone please DM them and as a reminder. We cannot verify if a compiled jar has not been tampered in any way

PrimordialOP•7mo ago

uh i cant send the /perf debug file, bot not letting me :') oh nvm sorry i was supposed to upload the file to misode oh god my brain is fried with all the information is there any way i can share it here other than taking all here?

Skullians•7mo ago

dm it if you want

1who¡ssus?•7mo ago

@Primordial you can try out a mod called dimensional threading If you have plenty of threads

Skullians•7mo ago

@Primordial do you know of any mod, command block or datapack that creates Ominous Pearls?

PrimordialOP•7mo ago

i got 3 threads uh, i cant find anything like that

Skullians•7mo ago

are you positive you aren’t using command blocks try disabling it in server.properties?

PrimordialOP•7mo ago

there could be some mod using it, i'll disable it in config

Skullians•7mo ago

Well if it was a mod it wouldn’t use the command blocks themselves

PrimordialOP•7mo ago

😭 this is trickier than i expected

PrimordialOP•7mo ago

i found the mod for this its a mod/datapack named ultris https://modrinth.com/datapack/ultris

Modrinth

Ultris: Boss Expansion - Minecraft Data Pack

Explore 8 new and exciting bosses to take on across your world, with new structures, items, and stories for you to unravel.

Skullians•7mo ago

ah yeah that’s probably your issue

PrimordialOP•7mo ago

thanku! also on further inspection it turns out tps drop is only in nether specifically, not in any other dimensions there are some other mods that are marked as "mods/datapack" on modrinth, from what i know they are just datapacks exported into mods? i think? probably why there werent any datapacks in the datapacks folder

Skullians•7mo ago

possibly

1who¡ssus?•7mo ago

mods as data packs are fine iirc

Skullians•7mo ago

well no, because the ultris ‘datapack / mod’ was the one causing a big portion of the lag I don’t know if @Primordial was using the datapack or mod ver

PrimordialOP•7mo ago

the mod version

Skullians•7mo ago

there you go @1who¡ssus?

1who¡ssus?•7mo ago

Owo

PrimordialOP•7mo ago

that was what i initially thought too, that mods would work differently, but apparently not

Skullians•7mo ago

(Context: the /perf zip that primordial sent me had ultris related stuff as the laggiest) Im not surprised, it adds several bosses and items

1who¡ssus?•7mo ago

Try akair flags too sync-chunk-writes: true Make this false You'll see some improvements I actually have got some akair flags you might wanna try

Skullians•7mo ago

Only do this if you’re using a HDD otherwise if you’re using an SSD keep it false but yeah use Aikar flags

PrimordialOP•7mo ago

there was another datapack hidden as a resourcepack, "spawn animations" https://modrinth.com/datapack/spawn-animations

Modrinth

Spawn Animations - Minecraft Data Pack

Hostile mobs dig out of the ground or poof into existence when they spawn!

PrimordialOP•7mo ago

just removing this thing fixed most of the lag, its not going below 17 tps, even that only when generating chunks

Skullians•7mo ago

yes that would also cause a lot of lag Have you not pregenerated?

PrimordialOP•7mo ago

where can i get more info about aikar flags? idk about them not yet, gonna do it now

Skullians•7mo ago

https://flags.sh/

flags.sh

A simple script generator to start your Minecraft servers with optimal flags.

PrimordialOP•7mo ago

Skullians•7mo ago

In the generated flags remove the always pre touch flag btw

PrimordialOP•7mo ago

oh aikar flags is just another name for java args?

Skullians•7mo ago

yeah theyre a specialised configuration of startup flags

1who¡ssus?•7mo ago

-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:G1ConcRefinementServiceIntervalMillis=150 -XX:G1ConcRSHotCardLimit=16

-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:G1ConcRefinementServiceIntervalMillis=150 -XX:G1ConcRSHotCardLimit=16

Skullians•7mo ago

this but remove always pre touch

1who¡ssus?•7mo ago

These supposedly are server oriented akair flags Oh yeah

Skullians•7mo ago

They’re not ‘bad’ but they preallocate the memory which can risk OOMs

1who¡ssus?•7mo ago

You must fully pregen your world!!!

PrimordialOP•7mo ago

do i modify it in the startup?

Skullians•7mo ago

^ no

1who¡ssus?•7mo ago

No? I sometimes modify them here

Skullians•7mo ago

add it to the user Java args there’s a txt file Send the contents of unix_args rq

PrimordialOP•7mo ago

i think java args file get ignored if there is a startup command set in pterodactyl?

Skullians•7mo ago

:nono: not exactly Send the contents of unix_args.txt

PrimordialOP•7mo ago

i copied a generic modpacks's args in the user_jvm_args file before

Skullians•7mo ago

ahhh yeah replace them with these in user JVM args and it should apply

PrimordialOP•7mo ago

this is the current file

Skullians•7mo ago

they’re actually fine but remove alwayspretouch

PrimordialOP•7mo ago

think its mostly the same

Skullians•7mo ago

mhm

PrimordialOP•7mo ago

removed

Skullians•7mo ago

can you send the unix args file content

PrimordialOP•7mo ago

# Xmx and Xms set the maximum and minimum RAM usage, respectively.
# They can take any number, followed by an M or a G.
# M means Megabyte, G means Gigabyte.
# For example, to set the maximum to 3GB: -Xmx3G
# To set the minimum to 2.5GB: -Xms2500M
# A good default for a modded server is 4GB.
# Uncomment the next line to set it.
# -Xmx4G
-Xms4G -Xmx10G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1

# Xmx and Xms set the maximum and minimum RAM usage, respectively.
# They can take any number, followed by an M or a G.
# M means Megabyte, G means Gigabyte.
# For example, to set the maximum to 3GB: -Xmx3G
# To set the minimum to 2.5GB: -Xms2500M
# A good default for a modded server is 4GB.
# Uncomment the next line to set it.
# -Xmx4G
-Xms4G -Xmx10G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1

oof

Skullians•7mo ago

that’s userjvmargs isn’t there a unix args file

PrimordialOP•7mo ago

i dont think there is one for forge theres a variables.txt

MINECRAFT_VERSION=1.20.1
MODLOADER=Forge
MODLOADER_VERSION=47.2.20
LEGACYFABRIC_INSTALLER_VERSION=0.11.1
FABRIC_INSTALLER_VERSION=1.0.0
QUILT_INSTALLER_VERSION=0.9.1
MINECRAFT_SERVER_URL=https://piston-data.mojang.com/v1/objects/84194a2f286ef7c14ed7ce0090dba59902951553/server.jar
JAVA_ARGS="-Xms4G -Xmx10G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1"
JAVA="java"

MINECRAFT_VERSION=1.20.1
MODLOADER=Forge
MODLOADER_VERSION=47.2.20
LEGACYFABRIC_INSTALLER_VERSION=0.11.1
FABRIC_INSTALLER_VERSION=1.0.0
QUILT_INSTALLER_VERSION=0.9.1
MINECRAFT_SERVER_URL=https://piston-data.mojang.com/v1/objects/84194a2f286ef7c14ed7ce0090dba59902951553/server.jar
JAVA_ARGS="-Xms4G -Xmx10G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1"
JAVA="java"

should i change the startup command too? java -Xms128M -XX:MaxRAMPercentage=95.0 -Dterminal.jline=false -Dterminal.ansi=true $( [[ ! -f unix_args.txt ]] && printf %s "-jar {{SERVER_JARFILE}}" || printf %s "@unix_args.txt" ) ahh there should be a unix_args according to startup command, i'll make one manually ig

PrimordialOP•7mo ago

current unix_args file, it was in the libraries directory

message.txt

Admincraft Meta•7mo ago

We have uploaded your file to a paste service for better readability

Paste services are more mobile friendly and easier to read than just posting a file

message.txt

https://mclo.gs/m5wamyk

Requested by primordial9470#0

Skullians•7mo ago

I would just add the aikar flags into the startup command

PrimordialOP•7mo ago