Abnormal resource usage

pmmp / PocketMine-MP

A server software for Minecraft: Bedrock Edition in PHP

https://pmmp.io

GNU Lesser General Public License v3.0

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Abnormal resource usage #3274

Closed nnnlog closed 4 years ago

nnnlog commented 4 years ago

Issue description

Expected result: Chunk loading performed in a reasonable time
Actual result: The chunk is loaded for a long time, during which the CPU usage is 100%.

Steps to reproduce the issue

join the server or teleport to other worlds.

OS and versions

PocketMine-MP: 43601e57bf242a87ca5ca0028deae97d93bb29ba
PHP: 7.3.13
Server OS: Ubuntu 18.04

Plugins

Same thing with or without the plugin.

Crashdump, backtrace or other files

https://timings.pmmp.io/?id=7809

dktapps commented 4 years ago

There's no problem with chunk loading in that timings report.

nnnlog commented 4 years ago

@dktapps Looking at resource usage using htop when moving from one world to another, it seems that PMMP's async task is reaching 100% CPU usage. I do not believe PMMP measures asynchronous operations.

dktapps commented 4 years ago

This isn't abnormal, it's just a consequence of using the new chunk format. The paletted format is more expensive to encode.