MemorySegment JVM memory leak

[ahmdprog.java at gmail.com]

Gentlemen,

 

There is memory leak in JVM while writing and reading byte array to memory
segment. The below is simple example that generates 100G file with zero
bytes. While running the below code, you will see that JVM consumes all
server memory.

 

Unfortunately, I tested also in reading array of bytes. It has same issue of
memory leak.

 

 

public static void testingMemorySegment() {

        String strFileName = "/disk3/bigdata.index" +
System.currentTimeMillis();

        File fileObjectFileName = new File(strFileName);

        if (fileObjectFileName.exists() == false) {

            try {

                fileObjectFileName.createNewFile();

            } catch (IOException e) {

            } catch (Exception e) {

            }

        } 

        long lngMemorySegmentFileSize = 107374182400l; // 100 G

        byte[] bytesArrayString = new byte[4096];

        MemorySegment sourceSegment =
MemorySegment.ofArray(bytesArrayString);

        long lngTotalNumberOfPagesForAllFile = lngMemorySegmentFileSize /
4096;

        try {

            MemorySegment memorySegmentTmp = MemorySegment.mapFromPath(new
File(strFileName).toPath(), lngMemorySegmentFileSize,
FileChannel.MapMode.READ_WRITE);

            MemoryAddress address = memorySegmentTmp.baseAddress();

            MemoryAddress sourceAddress = sourceSegment.baseAddress();

            for (long i = 0; i < lngTotalNumberOfPagesForAllFile; i++) {

                MemoryAddress.copy(sourceAddress, address.addOffset(i *
4096), 4096);

            }

            memorySegmentTmp.close();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }