geforkt von Mirrors/Paper
8c5b837e05
Firstly, the old methods all routed to the CompletableFuture method. However, the CF method could not guarantee that if the caller was off-main that the future would be "completed" on-main. Since the callback methods used the CF one, this meant that the callback methods did not guarantee that the callbacks were to be called on the main thread. Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb) so that the methods with the callback are guaranteed to invoke the callback on the main thread. The CF behavior remains unchanged; it may still appear to complete on main if invoked off-main. Secondly, remove the scheduleOnMain invocation in the async chunk completion. This unnecessarily delays the callback by 1 tick. Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which will load chunks within an area. This method is provided as a helper as keeping all chunks loaded within an area can be complicated to implement for plugins (due to the lacking ticket API), and is already implemented internally anyways. Fourthly, remove the ticket addition that occured with getChunkAt and getChunkAtAsync. The ticket addition may delay the unloading of the chunk unnecessarily. It also fixes a very rare timing bug where the future/callback would be completed after the chunk unloads.
55 Zeilen
2.9 KiB
Diff
55 Zeilen
2.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sat, 12 Sep 2020 17:21:38 -0400
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Subject: [PATCH] Cache DataFixerUpper Rewrite Rules on demand
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Mojang precaches every single potential rewrite rule that could ever
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exist on server startup. This includes rules from all the way back to versions from 6+ years ago.
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This is the source of why the server hogs every CPU core at 100% every start.
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For anyone who hard resets for updates or has force upgraded their entire world, this
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results in completely wasted cpu cycles.
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This massive CPU usage also delays server startup time.
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We improve this by making "min version to precache" that defaults to a future version
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so that no rewrite rules are precached.
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someone who expects to be converting a lot chunks could theoretically set
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-DPaper.minPrecachedDatafixVersion=<dataVersionConvertingFrom> as a startup
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parameter and only build from that point on.
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However this will likely never be needed as the server will still run
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the same cache logic on demand when it's actually needed. The only
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cost would be some delay on the FIRST chunk conversion, but paper already
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runs chunk conversions on another thread so this will likely never be
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a concern for TPS.
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This patch will significantly reduce CPU use on startup, reduce memory usage,
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and improve server startup time.
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diff --git a/src/main/java/com/mojang/datafixers/DataFixerBuilder.java b/src/main/java/com/mojang/datafixers/DataFixerBuilder.java
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index 4232ce05ad7dd122a78a04ccef3b59d4caf542df..2cce259c738de2680e219d30dc3020458f4442d6 100644
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--- a/src/main/java/com/mojang/datafixers/DataFixerBuilder.java
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+++ b/src/main/java/com/mojang/datafixers/DataFixerBuilder.java
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@@ -29,8 +29,10 @@ public class DataFixerBuilder {
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private final Int2ObjectSortedMap<Schema> schemas = new Int2ObjectAVLTreeMap<>();
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private final List<DataFix> globalList = new ArrayList<>();
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private final IntSortedSet fixerVersions = new IntAVLTreeSet();
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+ private final int minDataFixPrecacheVersion; // Paper - Perf: Cache DataFixerUpper Rewrite Rules on demand
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public DataFixerBuilder(final int dataVersion) {
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+ minDataFixPrecacheVersion = Integer.getInteger("Paper.minPrecachedDatafixVersion", dataVersion+1) * 10; // Paper - Perf: default to precache nothing - mojang stores versions * 10 to allow for 'sub versions'
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this.dataVersion = dataVersion;
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}
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@@ -88,6 +90,7 @@ public class DataFixerBuilder {
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final IntIterator iterator = fixerUpper.fixerVersions().iterator();
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while (iterator.hasNext()) {
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final int versionKey = iterator.nextInt();
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+ if (versionKey < minDataFixPrecacheVersion) continue; // Paper - Perf: Cache DataFixerUpper Rewrite Rules on demand
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final Schema schema = schemas.get(versionKey);
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for (final String typeName : schema.types()) {
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if (!requiredTypeNames.contains(typeName)) {
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