/debug

Syntax

/debug function <name>

/debug (start|stop)

Argument	Kind of value	What to type
<name>	Function	For function: the id of the function to trace, or a function tag starting with #.

Permission level	3: server operators with level 3 or higher
Works in	Singleplayer with cheats enabled and multiplayer servers. Needs permission level 3 (admins). Command blocks and functions run at level 2 and cannot use it.
Result	start reports "Started tick profiling" and returns 0. stop reports how many seconds and ticks were measured and the average ticks per second, and returns the ticks per second as a whole number. function reports how many commands were traced and the name of the output file.
start	Begins measuring. Fails with "The tick profiler is already started" if a measurement is running.
stop	Ends the measurement and reports the result. Fails with "The tick profiler hasn't started" if none is running.
function	Runs the given function or function tag and writes a trace of every command, result, function call, message, and error to a text file named debug-trace- followed by the date and time, in the debug folder of the game or server directory.
Function limits	The traced function runs with at most permission level 2. Tracing cannot be started from inside a function and cannot be combined with /return run.

/debug start

Starts measuring tick performance.

/debug stop

Stops measuring and shows the average ticks per second.