Starting Minecraft server with arguments while screen is off crashes Termux | Termux | Page 1

harsh thistle Jan 22, 2026, 5:10 PM

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Starting the server through ssh with these arguments:

-Xmx2G -Xms2G -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+AlwaysActAsServerClassMachine -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:+UseNUMA -XX:NmethodSweepActivity=1 -XX:ReservedCodeCacheSize=400M -XX:NonNMethodCodeHeapSize=12M -XX:ProfiledCodeHeapSize=194M -XX:NonProfiledCodeHeapSize=194M -XX:-DontCompileHugeMethods -XX:MaxNodeLimit=240000 -XX:NodeLimitFudgeFactor=8000 -XX:+UseVectorCmov -XX:+PerfDisableSharedMem -XX:+UseFastUnorderedTimeStamps -XX:+UseCriticalJavaThreadPriority -XX:ThreadPriorityPolicy=1 -XX:AllocatePrefetchStyle=3 -XX:+UseG1GC -XX:MaxGCPauseMillis=37 -XX:+PerfDisableSharedMem -XX:G1HeapRegionSize=16M -XX:G1NewSizePercent=23 -XX:G1ReservePercent=20 -XX:SurvivorRatio=32 -XX:G1MixedGCCountTarget=3 -XX:G1HeapWastePercent=20 -XX:InitiatingHeapOccupancyPercent=10 -XX:G1RSetUpdatingPauseTimePercent=0 -XX:MaxTenuringThreshold=1 -XX:G1SATBBufferEnqueueingThresholdPercent=30 -XX:G1ConcMarkStepDurationMillis=5.0 -XX:G1ConcRSHotCardLimit=16 -XX:G1ConcRefinementServiceIntervalMillis=150 -XX:GCTimeRatio=99

from https://github.com/DataDalton/Minecraft-Performance-Guide/blob/main/Java Arguments/README.md
with root, acquired wakelock, unrestricted battery usage, and permission for Termux to display over other apps(previously it was dropping the ssh connection).
I'm not sure if it's being killed by android or it just simply crashes due to one of the args. However while the screen is on it starts normally. Which makes me think it's most likely being killed.

safe owlBOT Jan 22, 2026, 5:10 PM

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lofty shale Jan 22, 2026, 5:25 PM

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Give logs

harsh thistle Jan 22, 2026, 5:53 PM

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lofty shale Give logs

How do I access them?

lofty shale Jan 22, 2026, 5:53 PM

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What you see when you launch the server

harsh thistle Jan 22, 2026, 5:58 PM

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lofty shale What you see when you launch the server

Only some info about some of the arguments and then I get kicked out of the ssh

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When I check the phone termux isnt running

lofty shale Jan 22, 2026, 6:04 PM

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Could you record the ssh session please?

harsh thistle Jan 22, 2026, 6:06 PM

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Not much to record. I just ssh in, cd into the server directory and start a bash script

lofty shale Jan 22, 2026, 6:08 PM

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But we need the output

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We can't guess what happens else

harsh thistle Jan 22, 2026, 6:09 PM

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Okay where is the output?

lofty shale Jan 22, 2026, 6:09 PM

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In your ssh session

harsh thistle Jan 22, 2026, 6:09 PM

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I ran logcat but I dont see any useful info

lofty shale Jan 22, 2026, 6:10 PM

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The output of your Bash script

harsh thistle Jan 22, 2026, 6:10 PM

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How would I get that?

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bash -v main.sh 
sudo java -Xmx2G -Xms2G -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+AlwaysActAsServerClassMachine -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:+UseNUMA -XX:NmethodSweepActivity=1 -XX:ReservedCodeCacheSize=400M -XX:NonNMethodCodeHeapSize=12M -XX:ProfiledCodeHeapSize=194M -XX:NonProfiledCodeHeapSize=194M -XX:-DontCompileHugeMethods -XX:MaxNodeLimit=240000 -XX:NodeLimitFudgeFactor=8000 -XX:+UseVectorCmov 
-XX:+PerfDisableSharedMem -XX:+UseFastUnorderedTimeStamps -XX:+UseCriticalJavaThreadPriority -XX:ThreadPriorityPolicy=1 -XX:AllocatePrefetchStyle=3 -XX:+UseG1GC -XX:MaxGCPauseMillis=37 -XX:+PerfDisableSharedMem -XX:G1HeapRegionSize=16M -XX:G1NewSizePercent=23 -XX:G1ReservePercent=20 -XX:SurvivorRatio=32 -XX:G1MixedGCCountTarget=3 -XX:G1HeapWastePercent=20 -XX:InitiatingHeapOccupancyPercent=10 -XX:G1RSetUpdatingPauseTimePercent=0 -XX:MaxTenuringThreshold=1 -XX:G1SATBBufferEnqueueingThresholdPercent=30 -XX:G1ConcMarkStepDurationMillis=5.0 -XX:G1ConcRSHotCardLimit=16 -XX:G1ConcRefinementServiceIntervalMillis=150 -XX:GCTimeRatio=99 -XX:ConcGCThreads=6 -jar server.jar
OpenJDK 64-Bit Server VM warning: Ignoring option G1ConcRSHotCardLimit; support was removed in 21.0
OpenJDK 64-Bit Server VM warning: Ignoring option G1ConcRefinementServiceIntervalMillis; support was removed in 20.0
Connection to 192.168.0.12 closed by remote host.
Connection to 192.168.0.12 closed.

This is all the ssh reports

lofty shale Jan 22, 2026, 6:45 PM

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It could be just because it uses too much performances. Try keeping Termux in the foreground.

harsh thistle Jan 22, 2026, 6:47 PM

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I don't have a way of doing that

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The screen has to be off

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Even if termux stays in the foreground while the screen turns off this happens

lofty shale Jan 22, 2026, 6:48 PM

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Keep the screen on

harsh thistle Jan 22, 2026, 6:49 PM

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Uses to much battery

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Even on the lowest brightness possible

lofty shale Jan 22, 2026, 6:58 PM

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Plug it so

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And how can you start Java with so much arguments?

harsh thistle Jan 22, 2026, 7:05 PM

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Apparently the Disable child process restrictions developer option is supposed to stop this behavior but it doesn't do anything in my case

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Honestly maybe it's not even being killed by android. Maybe it's crashing

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I don't see why any of those arguments would cause a crash. Maybe someone more experienced can let me know

lofty shale Jan 22, 2026, 7:20 PM

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harsh thistle Apparently the Disable child process restrictions developer option is supposed t...

Not exactly, the child process restriction is a limit for the number of child processes, not a CPU usage restriction.

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Java is only one.

lofty shale Jan 22, 2026, 7:21 PM

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harsh thistle I don't see why any of those arguments would cause a crash. Maybe someone more e...

They are made for older Java versions, some would just get worse performances

harsh thistle Jan 22, 2026, 7:25 PM

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lofty shale Not exactly, the child process restriction is a limit for the number of child pr...

Not true:
https://github.com/agnostic-apollo/Android-Docs/blob/master/en/docs/apps/processes/phantom-cached-and-empty-processes.md#how-to-disable-the-phantom-processes-killing

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Also those arguments were put together for java 17+

lofty shale Jan 22, 2026, 7:27 PM

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harsh thistle Also those arguments were put together for java 17+

Not java 25

harsh thistle Jan 22, 2026, 7:27 PM

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17+ and I'm using java 21

lofty shale Jan 22, 2026, 7:30 PM

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harsh thistle Not true: <https://github.com/agnostic-apollo/Android-Docs/blob/master/en/docs/a...

It's another thing that manages CPU usage, and it's not the setting that changes it

harsh thistle Jan 22, 2026, 7:31 PM

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According to that detailed explanation, that setting should disable the killing of apps which exceed the child process limit, and apps which use excessive CPU

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I believe it has worked for me before but I'm not sure what's causing it to not this time

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Unfortunately they didn't show a command for checking if that was actually toggled disabled

peak gazelle Jan 22, 2026, 10:49 PM

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@harsh thistle could you send output of this command please

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uname -m

harsh thistle Jan 22, 2026, 10:49 PM

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sure gime a sec

harsh thistle Jan 22, 2026, 10:50 PM

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peak gazelle <@229193645767655425> could you send output of this command please

aarch64

peak gazelle Jan 22, 2026, 10:51 PM

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ok good and if you try the minecraft server with no arguments does it still crash also without using sudo?

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i wouldn't recommend sudo for this (assuming you did use it with sudo since it's in your list)

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also "UnlockExperimentalVMOptions" doesn't have a name sounding like it's very stable

harsh thistle Jan 22, 2026, 10:53 PM

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peak gazelle i wouldn't recommend sudo for this (assuming you did use it with sudo since it's...

I didn't at first but some of the arguments require it

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I will try now

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but no it doesnt crash without args

peak gazelle Jan 22, 2026, 10:53 PM

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harsh thistle I didn't at first but some of the arguments require it

in that case i recommend not using those arguments unless there is a way to recompile java with a patch to make those arguments not require sudo

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because java in general even on pc, but especially on termux, should not require sudo

harsh thistle Jan 22, 2026, 10:55 PM

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you know I forgot about that. I know that running java as admin crashes it on windows...

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but no it just crashes without sudo due to "unknown signal 31"

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I'll have to filter out the args and see which ones are good. Thank you for the help @peak gazelle

safe owlBOT Jan 22, 2026, 11:05 PM

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peak gazelle because java in general even on pc, but especially on termux, should not require...

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#Starting Minecraft server with arguments while screen is off crashes Termux