Package sun.hotspot

Examples of sun.hotspot.WhiteBox

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public class JcmdDiffCallsite {

  public static void main(String args[]) throws Exception {
    OutputAnalyzer output;
    WhiteBox wb = WhiteBox.getWhiteBox();

    // Grab my own PID
    String pid = Integer.toString(ProcessTools.getProcessId());
    ProcessBuilder pb = new ProcessBuilder();

    // Use WB API to alloc and free with the mtTest type
    long memAlloc1 = wb.NMTMalloc(512 * 1024);

    // Use WB API to ensure that all data has been merged before we continue
    if (!wb.NMTWaitForDataMerge()) {
      throw new Exception("Call to WB API NMTWaitForDataMerge() failed");
    }

    // Run 'jcmd <pid> VM.native_memory baseline'
    pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "baseline"});
    pb.start();

    wb.NMTFree(memAlloc1);
    // Use WB API to ensure that all data has been merged before we continue
    if (!wb.NMTWaitForDataMerge()) {
      throw new Exception("Call to WB API NMTWaitForDataMerge() failed");
    }

    // Run 'jcmd <pid> VM.native_memory detail.diff'
    pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "detail.diff"});
    output = new OutputAnalyzer(pb.start());


    // Use WB API to ensure that all data has been merged before we continue
    if (!wb.NMTWaitForDataMerge()) {
      throw new Exception("Call to WB API NMTWaitForDataMerge() failed");
    }

    // above malloc callsite should report 0
    output = new OutputAnalyzer(pb.start());
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import sun.hotspot.WhiteBox;

public class ReleaseCommittedMemory {

  public static void main(String args[]) throws Exception {
    WhiteBox wb = WhiteBox.getWhiteBox();
    long reserveSize = 256 * 1024;
    long addr;

    addr = wb.NMTReserveMemory(reserveSize);
    wb.NMTCommitMemory(addr, 128*1024);
    wb.NMTReleaseMemory(addr, reserveSize);
    wb.NMTWaitForDataMerge();
  }
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public class MallocTestType {

  public static void main(String args[]) throws Exception {
    OutputAnalyzer output;
    WhiteBox wb = WhiteBox.getWhiteBox();

    // Grab my own PID
    String pid = Integer.toString(ProcessTools.getProcessId());
    ProcessBuilder pb = new ProcessBuilder();

    // Use WB API to alloc and free with the mtTest type
    long memAlloc3 = wb.NMTMalloc(128 * 1024);
    long memAlloc2 = wb.NMTMalloc(256 * 1024);
    wb.NMTFree(memAlloc3);
    long memAlloc1 = wb.NMTMalloc(512 * 1024);
    wb.NMTFree(memAlloc2);

    // Use WB API to ensure that all data has been merged before we continue
    if (!wb.NMTWaitForDataMerge()) {
      throw new Exception("Call to WB API NMTWaitForDataMerge() failed");
    }

    // Run 'jcmd <pid> VM.native_memory summary'
    pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "summary"});
    output = new OutputAnalyzer(pb.start());
    output.shouldContain("Test (reserved=512KB, committed=512KB)");

    // Free the memory allocated by NMTAllocTest
    wb.NMTFree(memAlloc1);

    // Use WB API to ensure that all data has been merged before we continue
    if (!wb.NMTWaitForDataMerge()) {
      throw new Exception("Call to WB API NMTWaitForDataMerge() failed");
    }
    output = new OutputAnalyzer(pb.start());
    output.shouldNotContain("Test (reserved=");
  }
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Related Classes of sun.hotspot.WhiteBox

  • JcmdDiffCallsite
  • MallocTestType
  • ReleaseCommittedMemory
  • ThreadedMallocTestType
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