Java out-of-heap memory (direct memory)

Java out-of-heap memory (direct memory unmanaged memory)

The benefits of out-of-heap memory are:

1. Can be extended to a larger memory space. For example, more than 1TB or even larger than main memory space.
2. In theory, the GC pause time can be reduced.
3. can be shared among processes , reducing object duplication between JVMs , making it easier to implement a split deployment of a JVM.
4. Its persistent storage enables fast reboots while also reproducing production data in a test environment.

For example, NIO provides a bytebuffer for efficient

PS: The method of interprocess communication in addition to conventional methods such as pipelines, signals, sockets, shared memory, and read-write files can also achieve interprocess communication.

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Java out-of-heap memory (direct memory)