Recently, I started to notice minor performance issues with my server, with messages of "Can't keep up! Is the server overloaded?..." on console and more server lag when more people are online.
#Minecraft server performance issues
glossy pebble
barren rover
Recently, I started to notice minor performance issues with my server, with mess...
!spark
tough pilotBOT
Spark
How to provide a Spark sampler.
- Stop your server.
- Download Spark: https://spark.lucko.me/download
- Upload the mod to your server:
Filemanager > mods (for modded servers)
or Filemanager > plugins (for plugin based servers)
(Just drag & drop the file) - Start the server.
- Use the command /spark profiler --only-ticks-over 70
- Wait 10-15 minutes.
- Use the command /spark profiler stop
- Copy the link it generates and paste it here.
barren rover
run this when you actually notice lag. It'll record what's happening during this lag so we can see and help find it
glossy pebble
ok
so to upload the mod onto the server, do I just download it and upload it in the mod folder?
well Im not sure if I installed it correctly, but now my server won't start
barren rover
so to upload the mod onto the server, do I just download it and upload it in the...
You need to put it on the server
not needed on your client
glossy pebble
I meant the mod folder in the files section of the server panel
glossy pebble
well, that was what I did, but now the server won't start. Is there anything else I'm supposed to install?
tough pilotBOT
Please send some logs over so we can help resolve your issue. To access logs on your Minecraft server, please navigate to your server panel's File Manager and take the following path:
1. Open the Server's File Manager
2. Navigate inside the 'logs' folder
3. Click on "latest.log" to download it and send the file over Discord to this channel.
glossy pebble
Im assuming I just install that into the mods folder of the server panel, right?
glossy pebble
barren rover
https://spark.lucko.me/ufZ6sQ5L7h
This shows basically 20TPS all the way through. No sign of lag
It’s important to run it all the way through lag otherwise it won’t really get any useful data
glossy pebble
I might run another one later
I think the server occasionally gets tps drops as it was at 13 tps when I checked the tps
glossy pebble
elder tinsel
Not a lot to note here, the drops are only at MSPT but it’s very rare - would need to be ran whilst it lags and stopped on time
glossy pebble
the main thing I notice on my server is that mobs have laggy movement
glossy pebble
like when they move towards you, they would sometimes freeze
glossy pebble
But it’s weird that the tps doesn’t seem to be the issue
And the issues seem to start happening when my friend is online
But when I’m online by myself, the server seems smooth
barren rover
like when they move towards you, they would sometimes freeze
is it just you or do others also notice this?
and if you try to break a block, does it take longer for the item to appear dropped or does that appear normal?
glossy pebble
It seems to start happening when my friend logs onto the server
iirc block breaking appears to be normal tho
glossy pebble
Im not sure what would cause the server performance to slightly degrade when my friend joins
fleet rivet
The fact that the server now has to load everything around both you and your friend basically.
Lag increasing when more people join is kind of a given, which is why we use tools to figure out what exactly is making that happen. Is it a crazy amount of mobs, world generation as people are exploring around, redstone machines, or some mod randomly taking up a bunch of the servers resources.
glossy pebble
seems like most weapons from the datapack cause the tps to drop
which is weird because in the past, it didn't do this
glossy pebble
Do I really have to remove this datapack?
glossy pebble
also I think the spark mod or fabric api messed up one of my datapacks. Is there a way to temporarity disable it?
barren rover
https://spark.lucko.me/Wb3MDeR5Jn
This spark profile is a lot more useful. It does show its getting a lot of performance degradation by commands, which is very likely the datapack
glossy pebble
Huh. Strangely enough, I’ve had this datapack for quite a while now, but only recently I’ve experienced the performance degradation.
Guess I’ll unfortunately have to remove it
Unless there’s a way to keep the datapack and prevent it from degrading server performance…
Is there a way to do that?
barren rover
Is there a way to do that?
Ask the datapack developer I’d say. Maybe they know something more about what could cause the drop in performance
barren rover
Again ask the datapack developer. It’s hard to tell
All spark sees is that it’s spending a crazy amount of time processing commands
glossy pebble
Ok
Also is there a way to temporarily disable spark or fabric api, since I think one of those mods may be affecting one of my datapacks
fleet rivet
you need fabric api for the mods youre runnig
its a dependency
Spark shouldnt do anything unless youre actively running a report
glossy pebble
The only mod I’m running is Spark
small sundial
Neither would effect a datapack.
glossy pebble
Huh, well one of the items from one of the datapacks that I’m running just stopped working
glossy pebble
Well I did /reload a few times
But I don’t think that would have broken the datapack
glossy pebble
I still kinda of want to disable them to see if they are affecting the datapack
fleet rivet
you delete them or put .d at the end of the file name and restart the server.
But if youre not going to be using fabric API, theres little reason to run fabric to begin with.
glossy pebble
Ok so it seems that my friend can use the item perfectly fine, but I can’t
And the weapons causing the server tps to drop seem to happen only when I use it
So could it be possible that something is wrong with my player data?
glossy pebble
Huh, well one of the items from one of the datapacks that I’m running just stopp...
Update: this is now fixed
Turns out it had nothing to do with fabric
glossy pebble
Still have to figure out why my server console is saying “can’t keep up! Is the server overloaded? Running 40 ticks behind”
And it seems to be around a consistent 40 ticks behind
barren rover
Still have to figure out why my server console is saying “can’t keep up! Is the ...
That error can appear, but if you don’t notice lag, it’s best to ignore it
It’s very common for a server to have a hiccup here and there and as long as it’s noticeable it’s not worth investigating
glossy pebble
well it keeps on occuring on the console
fleet rivet
9/10 modded Minecraft server will get that warning, yes.
Safe to ignore unless there's issues in game, like Seb said
glossy pebble
like when they move towards you, they would sometimes freeze
I still don’t get why this is happening when multiple players are online
Actually mob movement seems to have constant stuttering
And it doesn’t seem to have to do with tps
And other notable issue is with xp gain, in which instead of the xp bar increasing consistently, there would be pauses between the xp gain
Not sure if I explained that well
The server is still playable, but I would like to figure out why the issues have been happening
empty lotus
The server is still playable, but I would like to figure out why the issues have...
Why is there 900 striders ?
Either way it’s spending almost half the time running commands which as they said is the data pack.
You should try removing it and seeing if you get the issue still or if the TPS shows better results
glossy pebble
Well I disabled it, but the issue that I was talking about doesn’t seem to be related to the datapack
also strangely enough, it seems to be only when I use the weapons, the server tps drops
But when my friend uses it, there aren’t tps drops
Could it be caused by my player data or something?
glossy pebble
also is doing /datapack disable (datapack name) the same as removing the datapack from the datapack folder?
small sundial
No. There are several technical differences.
frigid junco
also is doing /datapack disable (datapack name) the same as removing the datapac...
If you don't need it, then it's always better to remove it from the folder itself.