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f37381ea8a
Removes synchronization from sending packets
Makes normal packet sends no longer need to be wrapped and queued like it use to work.
Adds more packet queue immunities on top of keep alive to let the following scenarios go out
without delay:
- Keep Alive
- Chat
- Kick
- All of the packets during the Player Joined World event
Hoping that latter one helps join timeout issues more too for slow connections.
Removes processing packet queue off of main thread
- for the few cases where it is allowed, order is not necessary nor
should it even be happening concurrently in first place (handshaking/login/status)
Ensures packets sent asynchronously are dispatched on main thread
This helps ensure safety for ProtocolLib as packet listeners
are commonly accessing world state. This will allow you to schedule
a packet to be sent async, but itll be dispatched sync for packet
listeners to process.
This should solve some deadlock risks
This may provide a decent performance improvement because thread synchronization incurs a cache reset
so by avoiding ever entering a synchronized block, we get to avoid that, and packet sending is a really
hot activity.
34 lines
1.4 KiB
Diff
34 lines
1.4 KiB
Diff
From 1a054b86819314f6e6aae65af695b3f048122466 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Mon, 4 May 2020 01:08:56 -0400
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Subject: [PATCH] Set cap on JDK per-thread native byte buffer cache
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See: https://www.evanjones.ca/java-bytebuffer-leak.html
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This is potentially a source of lots of native memory usage.
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We are clearly seeing native usage upwards to 1-4GB which doesn't make sense.
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Region File usage fixed in previous patch should of tecnically only been somewhat
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temporary until GC finally gets it some time later, but between all the various
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plugins doing IO on various threads, this hidden detail of the JDK could be
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keeping long lived large direct buffers in cache.
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Set system properly at server startup if not set already to help protect from this.
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diff --git a/src/main/java/org/bukkit/craftbukkit/Main.java b/src/main/java/org/bukkit/craftbukkit/Main.java
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index 093dbeae278..93340e9470b 100644
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--- a/src/main/java/org/bukkit/craftbukkit/Main.java
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+++ b/src/main/java/org/bukkit/craftbukkit/Main.java
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@@ -21,6 +21,7 @@ public class Main {
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public static void main(String[] args) {
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// Todo: Installation script
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+ if (System.getProperty("jdk.nio.maxCachedBufferSize") == null) System.setProperty("jdk.nio.maxCachedBufferSize", "262144"); // Paper - cap per-thread NIO cache size
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OptionParser parser = new OptionParser() {
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{
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acceptsAll(asList("?", "help"), "Show the help");
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--
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2.26.2
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