Where do these java native memory allocated from?

Question

JDK version is hotspot 8u_45

I researched native memory of my java process. The native memory even consumes more space than heap. However there are many native memor

Answer 1

Use jemalloc or tcmalloc - they both have built-in allocation profiler that will help to identify the source of allocations.

Java process may use too much native memory for many reasons. Popular reasons are

• Direct ByteBuffers
• Memory allocated by Unsafe.allocateMemory
• Unclosed resources (e.g. ZipInputStream)
• other native libraries

Note that NativeMemoryTracking will not show memory consumed by native libraries.