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Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
33 lines
1.6 KiB
Diff
33 lines
1.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Sun, 19 Jul 2020 15:17:01 -0700
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Subject: [PATCH] Name craft scheduler threads according to the plugin using
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them
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Provides quick access to culprits running far more threads than
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they should be
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diff --git a/src/main/java/org/bukkit/craftbukkit/scheduler/CraftAsyncTask.java b/src/main/java/org/bukkit/craftbukkit/scheduler/CraftAsyncTask.java
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index 365b7e7c665bec357fb76d1479bf17da6f603590..e97f6b76ef2fe21c7c2eca8d4a707e5866d70de9 100644
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--- a/src/main/java/org/bukkit/craftbukkit/scheduler/CraftAsyncTask.java
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+++ b/src/main/java/org/bukkit/craftbukkit/scheduler/CraftAsyncTask.java
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@@ -25,7 +25,10 @@ class CraftAsyncTask extends CraftTask {
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@Override
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public void run() {
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final Thread thread = Thread.currentThread();
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- synchronized (this.workers) {
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+ // Paper start - name threads according to running plugin
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+ final String nameBefore = thread.getName();
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+ thread.setName(nameBefore + " - " + this.getOwner().getName());
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+ try { synchronized (this.workers) { // Paper end - name threads according to running plugin
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if (this.getPeriod() == CraftTask.CANCEL) {
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// Never continue running after cancelled.
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// Checking this with the lock is important!
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@@ -92,6 +95,7 @@ class CraftAsyncTask extends CraftTask {
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}
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}
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}
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+ } finally { thread.setName(nameBefore); } // Paper - name threads according to running plugin
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}
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LinkedList<BukkitWorker> getWorkers() {
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