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  1. Minecraft: Java Edition
  2. MC-164476

Redstone Dust causes a ton of block updates when being unpowered



    • Type: Bug
    • Status: Resolved
    • Resolution: Duplicate
    • Affects Version/s: 1.14.4
    • Fix Version/s: None
    • Labels:
    • Environment:
      Windows 10
      Java 8
    • Confirmation Status:
    • Category:


      I just recently was made aware of this, so I decided to inject a println statement into updateNeighborsAlways() (a method that updates a block's 6 neighbors, and is called in the redstone dust update code, I'm not sure what it's official mapping is). The code I used is as follows:

      package com.camellias.mlpbim.mixin;import org.spongepowered.asm.mixin.Mixin;
      import org.spongepowered.asm.mixin.injection.At;
      import org.spongepowered.asm.mixin.injection.Inject;
      import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
      import net.minecraft.block.Block;
      import net.minecraft.util.math.BlockPos;
      import net.minecraft.world.World;@Mixin(World.class)
      public abstract class TestMixin
      	@Inject(method = "updateNeighborsAlways", at = @At("HEAD"))
      	private void inject(BlockPos blockPos_1, Block block_1, CallbackInfo info)
      		System.out.println(block_1 + " updated pos " + blockPos_1 + " during " + ((World) ((Object) this)).getTime());

      The mixin just injects the specified method (in this case updateNeighborsAlways()) in the specified class (World) at where ever I specified (in this case at the very beginning of the method). The parameters are the parameters of updateNeighborsAlways() plus CallbackInfo, as that's required for a mixin to work properly. The code injected is whatever I put inside the inject() method, which in this case is just a println so I can see what is updating when.

      I then proceeded to place down 15 pieces of redstone dust in a straight line, and power it with a lever.

      When I powered the redstone, it (the redstone dust, not the lever) only updated 105 times in a single tick, as expected (6 for the blocks around it plus itself, multiplied by 15, the amount of redstone dust).

      However, when unpowering it, the dust updated 448 times in a tick, which is more than 4 times then it should be. I'll attach the .txt files containing the results from both powering and unpowering the redstone below, as well as a screenshot of my setup.

      EDIT: I also forgot to mention. With only 7 redstone dust, it updated 308 times, so it appears the amount of updates it does is proportional with the power of the dust.


        1. powering_the_dust.txt
          13 kB
          Lily Camellias Loveheart
        2. redstone dust setup.png
          81 kB
          Lily Camellias Loveheart
        3. unpowering_the_dust.txt
          54 kB
          Lily Camellias Loveheart

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              Camellias Lily Camellias Loveheart
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