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Routine Falling Blocks Cleanup
DatapacksJava

Routine Falling Blocks Cleanup

by moomoolamoo · on Modrinth

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Routine Falling Blocks Cleanup — screenshot 1Routine Falling Blocks Cleanup — screenshot 2

Description

A datapack that runs every half hour to determine if there is an excessive number of falling_blocks (>100). If so, kills ALL of them immediately.

This fixes the lag, but does not address the offending mod(s) or vanillaness that caused/causes it in the first place.

This was made in response to the Meteors datapack spawning a ton of slow/none(?) decaying falling_blocks - https://modrinth.com/datapack/meteors . I'm not smart enough to put a watch timer on the methods of Meteors to clean up the mess in response to their events firing, so you'll lag until the cleanup runs.

Background

While trying to resolve a performance problem with a huge mod pack (450+), I discovered that my world had a ton of entities through the Spark mod. Not a significant number of villagers or birds or zombies, but over 3500 falling_block entities were loaded! Just look at this lovely log line:

BEFORE ->

Spoiler

[Server thread/WARN]: Can't keep up! Is the server overloaded? Running 29013ms or 580 ticks behind

Confounded by the lack of documentation on this, I fumbled around with the Internets until I discovered https://www.reddit.com/r/admincraft/comments/muw8zk/new_lag_chunk_ban_exploit_with_sand/, where the author 'blockswerker' had a helpful command for dealing with falling block exploits in their unrelated server issue. So, I fired that command into the console and my lag instantly cleared. I mean, there's a tiny bit of lag here and there, but the results are conclusive...

AFTER ->

Spoiler

[Server thread/WARN]: Can't keep up! Is the server overloaded? Running 4260ms or 85 ticks behind (this is also while flying around in creative loading a lot of chunks while trying to get this mod running)

Also, that's nearly 85% improvement!

The natural thing to do is to find a mod that solved this problem. Doesn't exist. I'm running a Fabric server, so no easy scheduler mod. Then I learned about datapacks and %*I&EUY$ this was an awful experience to get working with near-zero knowledge of how this stuff works.

I imagine that with minor tweaking of the embedded commands, you can back-port or forward-port this to fit your needs. It's also an acceptable (not really a scheduler) tutorial on how to reliabily run commands using a infinite timer.

So, this is my first 'mod' I guess for MC. Maybe there's a better way. I hope it helps.

Install

  1. Before installing, either run a Spark profiler job and check your entities count for 'falling_blocks', or you can run these commands in sequence to verify you have a large quantity of 'falling_blocks' and need this tool.

    a: scoreboard objectives add testEntityCount dummy

    b: scoreboard players set @s testEntityCount 0

    c: execute as @e[type=falling_block] run scoreboard players add @p testEntityCount 1

    d: tellraw @s [{"score":{"name":"@a","objective":"testEntityCount"}}," falling_block entities loaded"]

2A. For single player or self-hosted LAN users: place into your 'saves//datapacks' folder

2B. For dedicated servers, place into your server World/Datapacks folder

More Sauce

Spoiler

Since Modrinth doesn't have comments or DMs, I figure some of you might be interested in the mods and settings I have.

I am running Minecraft 1.21.1, on a Ryzen 5800x 128GB RAM system, paired with a 4080. That's it.

I allot 12GB to Java v22 - flags are:

-Xms12288M -Xmx12288M -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:+ParallelRefProcEnabled -XX:+PerfDisableSharedMem -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1HeapRegionSize=24M -XX:G1HeapWastePercent=5 -XX:G1MaxNewSizePercent=40 -XX:G1MixedGCCountTarget=4 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1NewSizePercent=30 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:G1ReservePercent=20 -XX:InitiatingHeapOccupancyPercent=15 -XX:MaxGCPauseMillis=200 -XX:MaxTenuringThreshold=1 -XX:SurvivorRatio=32 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true

Fabric Mods:

Loaded Shaderpack: ComplementaryUnbound_r5.4 + EuphoriaPatches_1.5.2

Resource Packs:

Quick facts

Install steps are the general flow for this file type — see the MC Java Mods guides for the full walkthrough.

Verified by MCModsHub

These come from our own check of the pack file, not from the source page.

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