Startup Issue with Minecraft - TPS low, although resource usage is minimal

Technical Support
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System Information

Field Value
Operating System Linux - Debian GNU/Linux 12 on x86_64
Product AMP ‘Callisto’ v2.5.1.0 (Mainline)
Virtualization Docker
Application Minecraft
Module MinecraftModule
Running in Container Yes
Current State Starting

Problem Description

Issue

The server was running fine before, 20/20 TPS all the time, now it’s running on max 6 TPS wihout any possibility to play. What is the issue here? The resources usage is low and running on a powerful server.

Errors cause the server to restart, although no changes were made. Server is running on 16GB of RAM and the server has 32GB, CPU utilization is at max 2%

Reproduction Steps

  • Checked Resource Usage, it is low, checked logs, many errors, but not regarding the server itself or the modpack as it was running well before without any changes
  • Checked resource usage, it’s minimal
  • Checked logs
  • Reduced the render and simulation distance to 8
2

Minecraft is mostly singlethreaded, so low TPS with low CPU usage is to be expected.
You’ll want to look at single-core calculations for a better read on the situation.
Use the Spark plugin/mod to diagnose what’s using CPU time on the server.

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