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Profiling for a region starts with the /profiler command. The usage for /profiler: /profiler <world> <block x> <block z> <time in s> [radius, default 100 blocks] Any region within the radius of the specified block coordinates will be profiled. The profiling will stop after the specified time has passed. Once the profiler finishes, it will place a report in the directory ./profiler/<id>. Since regions can split into smaller regions, or merge into other regions, the profiler will track this information. If a profiled region splits, then all of the regions it splits into are attached to the same profiler instance. If a profiled region merges into another region, then the merged region is profiled. This information is tracked and logged into the "journal.txt" file contained in the report directory. The journal tracks the region ids for the merge/split operations. Region profiling is placed into the "region-X.txt" file where X is the region id inside the profile directory. The header of the file describes some stats about the region, namely total profiling duration, ticks, utilisation, TPS, and MSPT. Then, the timing tree is follows. The format is as specified: There are two types of data recorded: Timers and Counters. Timers are specified as follows: <indent><name> X% total, Y% parent, self A% total, self B% children, avg D sum E, Fms raw sum The above specifies the format for a named timer. The <indent> specifies the number of parent timers. "X" represents the percentage of time the timer took relative to the entire profiling instance. "Y" represents the percentage of time the timer took relative to its _parents_ timer. For example: ``` Full Tick 100.000% total, 100.000% parent, self 0.889% total, self 0.889% children, avg 200.000 sum 200, 401.300ms raw sum |+++Tick World: minecraft:overworld 81.409% total, 81.409% parent, self 1.873% total, self 2.301% children, avg 1.000 sum 200, 326.694ms raw sum |---|---Entity Tick 56.784% total, 69.751% parent, self 6.049% total, self 10.652% children, avg 1.000 sum 200, 227.874ms raw sum ``` "Entity Tick" measured 69.751% of the time for the "Tick World: minecraft:overworld" timer. "A" represents the self time relative to the entire profiling instance. The self time is the amount of time for a timer that is _not_ measured by a child timer. "B" represents the self time relative to its _parents_ timer. "D" represents the average number of times the timer is invoked relative to its parent. For example: ``` |---|---|---Entity Tick: bat 2.642% total, 7.343% parent, self 2.642% total, self 100.000% children, avg 14.975 sum 2,995, 23.127ms raw sum ``` In this case, an average of 14.975 bats were ticked for every time the "Entity Tick" timer was invoked. "E" represents the total number of times the timer is invoked. "F" represents the total raw time accumulated by the timer. Counters are specified as follows: <indent>#<name> avg X sum Y The X is the average number of times the counter is invoked relative to the parent, exactly similar to the D field of Timers, where Y is the total number of times the counter is invoked. |
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