Increased memory footprint in 4.1.43.Final

Expected behavior

Memory usage should not largely increase between Netty versions.

Actual behavior

Memory usage increased in user application tests, and io.netty.testsuite.transport.socket.SocketSslEchoTest#testSslEcho() netty test.

4.1.42.Final

Heap Usage: 59 MB Non-Heap Usage: 41 MB

4.1.43.Final

Heap Usage: 241 MB Non-Heap Usage: 41 MB

Note: While this is listed as “byte[]”, it’s just more PoolChunks (except for the Stack Local listed above):

Initial Analysis

I’m still working to identify the source of this difference between the two versions. I’ll update this issue as I find more information.

Steps to reproduce

1. git checkout netty-4.1.42.Final
2. Benchmark memory usage DURING execution of io.netty.testsuite.transport.socket.SocketSslEchoTest#testSslEcho()
3. git checkout netty-4.1.43.Final
4. Benchmark memory usage DURING execution of io.netty.testsuite.transport.socket.SocketSslEchoTest#testSslEcho()
5. Compare memory usage

Minimal yet complete reproducer code (or URL to code)

SocketSslEchoTest#testSslEcho()

Netty version

4.1.43.Final

JVM version (e.g. java -version)

openjdk version “1.8.0_232” OpenJDK Runtime Environment Corretto-8.232.09.1 (build 1.8.0_232-b09) OpenJDK 64-Bit Server VM Corretto-8.232.09.1 (build 25.232-b09, mixed mode)

OS version (e.g. uname -a)

Darwin 38f9d3cc3b07.ant.amazon.com 18.7.0 Darwin Kernel Version 18.7.0: Tue Aug 20 16:57:14 PDT 2019; root:xnu-4903.271.2~2/RELEASE_X86_64 x86_64

[normanmaurer]

Let me have a look… Sorry I totally lost track of this one

[raghavb1979]

Hello I am also facing a similar issue when took a heap dump and checked in the eclipse MAT it is showing the leak as io.netty.buffer.PoolChunk ( 54.28%) occupied. Is there any way to trace this problem? Does this problem will get solved by defining -Dio.netty.allocator.numHeapArenas=0? Please let me know.