Minecraft jfr command

The Minecraft jfr command is a powerful tool that allows players to collect detailed Java Flight Recorder data in-game. By using this command, players can monitor and analyze various aspects of the game’s performance, such as CPU usage, memory allocation, and thread activity. The jfr command provides valuable insights for optimizing and troubleshooting issues, making it an essential tool for advanced players and server administrators. By mastering the jfr command, players can enhance their gameplay experience and fine-tune their Minecraft environment for optimal performance.

jfr Syntax:

/jfr start [options] [duration]

Options:

Option	Description
—all	Record all available events
—cpu	Record CPU profiling data
—lock	Record monitor contention data
—heap	Record heap allocation data
—file	Specify the output file for the recording
—name	Set a custom name for the recording

Parameters:

Parameter	Description
duration	Duration of the recording in seconds

Caution

Be cautious when using the jfr command as it can potentially cause performance issues in your Minecraft server if used excessively or incorrectly.

jfr Usage:

Start Java Flight Recorder

jfr start

Starts Java Flight Recorder for collecting diagnostic and profiling data from the JVM.

Stop Java Flight Recorder

jfr stop

Stops the Java Flight Recorder, ending the data collection process.

Export Java Flight Recorder Data

jfr dump filename=myrecording.jfr

Exports the data collected by Java Flight Recorder to a specified filename for further analysis.

Enable Java Flight Recorder Event

jfr set maxChunkSize=100M

Adjusts the maximum size of chunks generated by Java Flight Recorder to optimize the data collection process.

Tip

When using the jfr command in Minecraft, make sure to carefully review the available options and values that can be used with the command to optimize its functionality based on your specific needs.

How do I use jfr in Minecraft?

To use the jfr command in Minecraft, execute the following command:

jfr --start filename=myrecording.jfr

How can I stop a recording using jfr in Minecraft?

To stop a recording using jfr in Minecraft, use the following command:

jfr --stop filename=myrecording.jfr

How do I configure the duration of a recording with jfr in Minecraft?

To configure the duration of a recording with jfr in Minecraft, you can use the following command:

jfr --start filename=myrecording.jfr duration=30s

How can I add custom events to a recording using jfr in Minecraft?

To add custom events to a recording using jfr in Minecraft, you can use the following command:

jfr --start filename=myrecording.jfr settings=profile duration=1m

How do I list the available settings for jfr in Minecraft?

To list the available settings for jfr in Minecraft, you can use the following command:

jfr --help

How can I manage disk usage when recording with jfr in Minecraft?

To manage disk usage when recording with jfr in Minecraft, you can set a maximum file size for recordings using the following command:

jfr --start filename=myrecording.jfr maxsize=1GB

How do I analyze a saved JFR recording in Minecraft?

To analyze a saved JFR recording in Minecraft, you can use the following command:

jfr --analyzse filename=myrecording.jfr

Applications of the jfr command

1. Record and analyze performance data in Minecraft.
2. Monitor and troubleshoot server performance issues.
3. Identify potential sources of lag or delays in the game.
4. Optimize and fine-tune server settings for better gameplay experience.
5. Track and resolve memory usage or garbage collection issues.