How to Read a Spark Report of Your Minecraft Server

Note:

Spark is a plugin that keeps Minecraft servers fast and stable with three tools: a ‘Profiler’ to find bottlenecks, a ‘Memory Inspector’ to analyze resource consumption and a ‘Health Report’ to monitor vital long-term metrics.

1. Open Minecraft

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2. Log In to Your Server With Your Admin Account

If you don’t know how to be an admin on your server, you can view our How To Make a Player OP (Operator) in Minecraft article.

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3. Enter the Command /spark profiler start

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3.1. Wait Between 5 to 10 Minutes

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4. Enter the Command /spark profiler stop

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4.1. Copy the Generated Report Link

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5. Open Your Generated Spark Report Link in Your Browser

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5.1. Expand the Server Thread Line

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5.2. Analyze the Process Tree in Your Report

– Server thread (100%): This is the main thread which will always be at 100% as it represents all the sampled time.

– MinecraftServer.runServer(): This is the line containing the server’s game loop. This is the function that repeatedly calls the ‘tick’ function and manages the server’s startup/shutdown.

This line will always be nearly 100% because the server is running continuously.

– MinecraftServer.recordTaskExecutionTimeWhileWaiting(): This is the function that manages CPU idle time or waiting. In our case, the 93.77% means that during the total sampling time, the server was idle and this indicates there was no lag on the server.

– MinecraftServer.processPacketsAndTick(): This is the function that performs the actual work of Minecraft within each tick. Here you can find: processing player network packets, physics updates, moving entities (mobs), loading and unloading chunks and executing plugins (if any are present).

If you want to learn in depth how to read a Spark report, you can view the official documentation on their website.

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