What is hprof file?

is the memory image file of the java process, which contains detailed usage information of the memory heap.

I recently studied a book on Java virtual machines and followed the examples in it.

How to open hprof?

The following is the demo:

/**
 * VM Args：-Xms20m -Xmx20m -XX:+HeapDumpOnOutOfMemoryError
 * @author zzm
 */
public class HeapOOM {
    static class OOMObject {
    }
    public static void main(String[] args) {
        List<OOMObject> list = new ArrayList<OOMObject>();
        while (true) {
            list.add(new OOMObject());
        }
    }
}

Program execution effect:

The hprof file path generated here:

E:\IdeaProjects\java-virtual\java_pid2432.hprof

If you open this kind of file, you can Use the following software:

Memory Analyzer

Official website: http://www.eclipse.org/mat/downloads.php

Double-click to open and load the corresponding hprof.

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