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Set cap on JDK per-thread native byte buffer cache

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See: https://www.evanjones.ca/java-bytebuffer-leak.html

This is potentially a source of lots of native memory usage.

We are clearly seeing native usage upwards to 1-4GB which doesn't make sense.

Region File usage fixed in previous patch should of tecnically only been somewhat
temporary until GC finally gets it some time later, but between all the various
plugins doing IO on various threads, this hidden detail of the JDK could be
keeping long lived large direct buffers in cache.

Set system properly at server startup if not set already to help protect from this.
This commit is contained in:
Aikar 2020-05-04 01:08:56 -04:00
parent 269fd00d2a
commit e058d38078
1 changed files with 1 additions and 0 deletions
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paper-server/src/main/java/org/bukkit/craftbukkit/Main.java
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@ -27,6 +27,7 @@ public class Main {
}
// Paper end
// Todo: Installation script
if (System.getProperty("jdk.nio.maxCachedBufferSize") == null) System.setProperty("jdk.nio.maxCachedBufferSize", "262144"); // Paper - cap per-thread NIO cache size; https://www.evanjones.ca/java-bytebuffer-leak.html
OptionParser parser = new OptionParser() {
{
this.acceptsAll(Main.asList("?", "help"), "Show the help");