Help diagnosing lag issues
Hello again 🙂
I'm just wondering if anyone can have a once-over my spark profile and help direct me to what's causing some of the lag issues that we're currently having?
https://spark.lucko.me/VvyQTYslTw
spark
spark is a performance profiler for Minecraft clients, servers, and proxies.
69 Replies
Spark Profile Analysis
These are not magic values. Many of these settings have real consequences on your server's mechanics. See this guide for detailed information on the functionality of each setting.
❌ Low Memory
Allocate at least 6-10GB of ram to your server if you can afford it.
❌ Threads
You only have 2 thread(s).
❌ chunk-gc.period-in-ticks
Decrease this in bukkit.yml.
Recommended: 400.
❌ ticks-per.monster-spawns
Increase this in bukkit.yml.
Recommended: 4.
❌ spawn-limits.monsters
Decrease this in bukkit.yml.
Recommended: 15.
❌ spawn-limits.water-ambient
Decrease this in bukkit.yml.
Recommended: 5.
❌ spawn-limits.ambient
Decrease this in bukkit.yml.
Recommended: 1.
❌ spawn-limits.animals
Decrease this in bukkit.yml.
Recommended: 5.
❌ entity-activation-range.animals
Decrease this in spigot.yml.
Recommended: 16.
❌ entity-activation-range.monsters
Decrease this in spigot.yml.
Recommended: 16.
❌ entity-activation-range.misc
Decrease this in spigot.yml.
Recommended: 12.
❌ entity-activation-range.water
Decrease this in spigot.yml.
Recommended: 12.
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Requested by element3329 • Page 1 of 4
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Requested by element3329#0
Your GC is crumbling hard
@Jared | InfraCharm :stare:
Get. Me. A. GC. Log. Before. Pinging. Me.
aw fuck
it’s 11pm
sorry
Add this to your startup flags:
-Xlog:gc*:file=gc.log:time,tags:filecount=5,filesize=10M
It will generate a gc.log file.
Run your server for 15 minutes along with a new spark report.
When the 15 minutes are over, send me:
* gc.log
* Spark Report
* Startup Parameters
* System Specs
* Ptero Container Specs
@ElementSure I will do 🙂
I've just added this to the end of my startup flags
Then restart my server, 15 minutes later stop it to get the logs?
Make sure it’s before the -jar part
yup! You don’t have to stop the server, just send over the log, spark and specs listed above
I don't think I have a -jar part on my flags
-XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -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 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true
There are my startup flagsoh, just chuck the gc log flags anywhere in there
Sure
15 mins time it'll be here 🙂
Hmm. For some reason the flags I'm setting are once again not applying
I'm gonna need to speak to my host provider again
Because I'm not able to generate the gc log while the flag doesn't appyl
are you able to view your flags? It’s possible they’re resetting because you might have pasted it in wrong
Not sure how your host handles it
-XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -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 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true -Xlog:gc*:file=gc.log:time,tags:filecount=5,filesize=10M
-Xmx4100M -Xms128M -XX:MaxDirectMemorySize=900M -XX:MaxMetaspaceSize=1024M -XX:MaxRAMPercentage=90.0 -Dterminal.jline=false -Dterminal.ansi=true -Dheap900 -Did=813641 -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -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 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true
You are restarting your server right?
Try stop your server first, apply the flags and then start
I'll try that
I previously had applied them, then hit the restart button
yeah just trying different stuff
Yeah, same thing, doesn't apply the new ones
I'll speak to my server host. They had to manually set the flags I've got now because I had this problem before
ah, unfortunate
Hey @Skullians 🙂 I finally got a response from the host and they've got the flags applied properly. Here's the GC log attached
Startup flags are:
-Xmx4100M -Xms128M -XX:MaxDirectMemorySize=900M -XX:MaxMetaspaceSize=1024M -XX:MaxRAMPercentage=90.0 -Dterminal.jline=false -Dterminal.ansi=true -Dheap900 -Did=813641 -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -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 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true -Xlog:gc*:file=gc.log:time,tags:filecount=5,filesize=10M
spark
spark is a performance profiler for Minecraft clients, servers, and proxies.
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
gc.log
Requested by element3329
Spark Profile Analysis
These are not magic values. Many of these settings have real consequences on your server's mechanics. See this guide for detailed information on the functionality of each setting.
✅ Your server isn't lagging
Your server is running fine with an average TPS of 20.
Requested by element3329 • Page 1 of 4
how much ram do you have (what plan did you choose)
I'm paying for 5GB on their premium plan
@Jared | InfraCharm 5gb, 2 threads of a ryzen 9 7900
If a flag does not work (your server doesn't start), go ahead and remove the flag and let me know which one it was.
Go ahead and run a new spark report for 30 minutes.
@Element
I will do 🙂 might take a while for results because there's a good chance I'll have to go back to my server host to have them apply the flags first
My startup says these flags can't apply
-Xmx4100M -Xms128M -XX:MaxDirectMemorySize -XX:MaxMetaspaceSize -XX:MaxRAMPercentage -Dterminal.jline -Dterminal.ansi
Should I change them at all? I think I can get them applied if I ask my server host directly to apply them
You can skip those ones
This is what I got from my spark report, is it okay?
https://spark.lucko.me/LzdfcS0BIC
Okay here's the 30min profile
spark
spark is a performance profiler for Minecraft clients, servers, and proxies.
Spark Profile Analysis
These are not magic values. Many of these settings have real consequences on your server's mechanics. See this guide for detailed information on the functionality of each setting.
✅ Your server isn't lagging
Your server is running fine with an average TPS of 20.
Requested by element3329 • Page 1 of 4
@Jared | InfraCharm I hope you don't mind the ping, is the above okay?
No rush if you're busy
Ah let me look!
Can you send the new gc.log too? Look at the timestamp to see which the most current is
Here you are
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
newgc.log
Requested by element3329
Try these, same instructions as earlier! @Eternal
Sure, I'm gonna go to sleep but I will udpate in the morning 🙂
okay, here's a 30 minute profile and the latest gc log 🙂
Only 1-2 players online at the time though so it isn't the most representative test. If you want I can do the test again later tonight when more are on
https://spark.lucko.me/jd0AfvGo5X
spark
spark is a performance profiler for Minecraft clients, servers, and proxies.
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
gcnewest.log
Requested by element3329
Spark Profile Analysis
These are not magic values. Many of these settings have real consequences on your server's mechanics. See this guide for detailed information on the functionality of each setting.
✅ Your server isn't lagging
Your server is running fine with an average TPS of 20.
Requested by element3329 • Page 1 of 4
thanks for the custom GC flags!
:KEKW:
Why does that host have 53gb of swap in use…
I take this as sarcasm
yes but like, you tagged me out of nowhere
i think you intended to ping element so i made that to a joke
Oh shit
my bad
it's fine :KEKW:
To be fair, it’s understandable
Yeah, but the memory usage plus swap usage well exceeds the amount of memory the machine has
And I’m assuming that’s why g1 old is slow
ah
didnt check the spark report so dunno
1.3s on G1 old
But if part of the heap is in swap it would sound about right
It seems like these flags have caused it to get slightly worse? bigger spikes I've noticed
@Jared | InfraCharm How's this looking? forgive me if you're not interested anymore 😄
Your GC is still lagging
for some reason
I have no idea why that would be 😭
Is there any info I can give that might help diagnose it?
Do you think I should revert to the previous flags? Or are the ones I got the best for now
Which host are you using?
PebbleHost
Sorry for the ping, do you still have any thoughts on this? 🙂
budget? premium?
GitHub
GitHub - brucethemoose/Minecraft-Performance-Flags-Benchmarks: Sane...
Sane, Benchmarked Java Flags and Tweaks for Minecraft - brucethemoose/Minecraft-Performance-Flags-Benchmarks
might help, try https://github.com/brucethemoose/Minecraft-Performance-Flags-Benchmarks?tab=readme-ov-file#shenandoah
GitHub
GitHub - brucethemoose/Minecraft-Performance-Flags-Benchmarks: Sane...
Sane, Benchmarked Java Flags and Tweaks for Minecraft - brucethemoose/Minecraft-Performance-Flags-Benchmarks
ew no
Shendoah is not really good
old tests, few are on servers, test is done in a not very stable way
Premium
I've done all I can do for you, you were running good so maybe you can revert to the last set. Not sure.
Either way thank you so much for the help you offered 🙂
Ran a spark profile on one of the bad moments. It seems like after the server starts to lag, it doesn't stop until a restart, even if players stop all activity
https://spark.lucko.me/fykq2X5fvI
Anyone got any ideas?
spark
spark is a performance profiler for Minecraft clients, servers, and proxies.
Spark Profile Analysis
These are not magic values. Many of these settings have real consequences on your server's mechanics. See this guide for detailed information on the functionality of each setting.
✅ Your server isn't lagging
Your server is running fine with an average TPS of 19.
Requested by element3329 • Page 1 of 4
And those G1 Old and G1 During GCs still seem to be doing real bad
It all starts usually after I fly around generating new chunks a lot, but even if I stop doing that, and return to normal play, the lag stays around indefinitely until a restart
And here's a couple of GC logs from directly before and after a server restart when it was rough, if anybody would like to take a look
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
postrestartgc.log
prerestartgc.log
Requested by element3329
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