Minecraft:Commands/jfr

Starts and stops profiling with

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Template:Redr (JEP) as well as a few custom events.

Usage

When profiling, it records several information about CPU, memory, and threads usage of the client while it was running, and saves them on a .jfr file under the

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Template:Redr folder.

The file can be opened using an external tool or software, such as VisualVM or JMC. It contains JVM and operating system events, with several Minecraft-related custom events below:

• Network group, which contains:
  • Network Packet Received and Network Packet Sent: network packet events, containing information about their protocol ID, packet ID, packet direction (server or client bound), remote address, and bytes size. See Java Edition protocol for list of protocol and packet IDs.
  • Network Summary: summary information of received and sent packets count and their bytes size.

• Storage group, which contains:
  • Region File Read and Region File Write: region file events, containing information about region and chunk positions, dimension, and type of compression algorithm.

• Ticking group, which only contains a single custom event:
  • Server Tick Time: sampling event of the average server tick duration at one second intervals.

• World Generation group, which contains:
  • Chunk Generation: time taken to generate individual chunk stages.
  • Create/Load World: initial world loading duration when loading a world.

The .jfr file is accompanied by a summary Minecraft:JSON report is written both to the log file and in the debug folder.

Syntax

jfr start

Start JFR profiling.

jfr stop

Stop JFR profiling.

Output

{{#vardefine:output-table-lines|}}{{#vardefine:output-table-lines|-2}}{{#vardefine:output-table-lines-now|}}{{#vardefine:command-num-now|}}{{#vardefine:command-line-now|}}{{#vardefine:commands-num|}}{{#vardefine:output-edition-num-now|}}{{#vardefine:output-edition-line-now|}}{{#vardefine:output-editions-num|}}{{#vardefine:je-outputs-dis|}}

{{#vardefine:output-table-lines|}}{{#vardefine:situation-{{#var:output-table-lines}}|On fail}}{{#vardefine:output1-{{#var:output-table-lines}}|N/A}}{{#vardefine:output2-{{#var:output-table-lines}}|0}}{{#vardefine:output3-{{#var:output-table-lines}}|0}}{{#vardefine:command-row-{{#var:commands-num}}|}}{{#vardefine:output-editions-num|}}{{#vardefine:output-edition-{{#var:output-editions-num}}|je}}{{#vardefine:output-edition-row-{{#var:output-editions-num}}|1}} {{#vardefine:output-table-lines|}}{{#vardefine:situation-{{#var:output-table-lines}}|On success}}{{#vardefine:output1-{{#var:output-table-lines}}|N/A}}{{#vardefine:output2-{{#var:output-table-lines}}|1}}{{#vardefine:output3-{{#var:output-table-lines}}|1}}{{#vardefine:command-row-{{#var:commands-num}}|}}{{#vardefine:output-edition-row-{{#var:output-editions-num}}|}}

{{#vardefine:output-table-lines|}}{{#vardefine:output-table-lines|-2}}{{#vardefine:output-table-lines-now|}}{{#vardefine:command-num-now|}}{{#vardefine:command-line-now|}}{{#vardefine:commands-num|}}{{#vardefine:output-edition-num-now|}}{{#vardefine:output-edition-line-now|}}{{#vardefine:output-editions-num|}}{{#vardefine:je-outputs-dis|}}

Navigation

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Template:El only	classroommode closechat code codebuilder lesson remove videostream Removed position videostreamaction
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Joke	debugdim transform vote warp
Related	Argument types Permission level Slot Target selectors

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