src/jalview/bin/MemoryPercent.java

   1 package jalview.bin;
   2
   3 import java.lang.management.ManagementFactory;
   4 import java.lang.management.OperatingSystemMXBean;
   5
   6 public class MemoryPercent
   7 {
   8
   9   protected static long getPhysicalMemory()
  10   {
  11     final OperatingSystemMXBean o = ManagementFactory
  12             .getOperatingSystemMXBean();
  13
  14     try
  15     {
  16       if (o instanceof com.sun.management.OperatingSystemMXBean)
  17       {
  18         final com.sun.management.OperatingSystemMXBean osb = (com.sun.management.OperatingSystemMXBean) o;
  19         return osb.getTotalPhysicalMemorySize();
  20       }
  21     } catch (NoClassDefFoundError e)
  22     {
  23       // com.sun.management.OperatingSystemMXBean doesn't exist in this JVM
  24       System.out.println("No com.sun.management.OperatingSystemMXBean");
  25     }
  26
  27     // We didn't get a com.sun.management.OperatingSystemMXBean.
  28     return -1;
  29   }
  30
  31   public static long memPercent(int percent)
  32   {
  33     return memPercent(percent);
  34   }
  35   public static long memPercent(float percent)
  36   {
  37     long memPercent = -1;
  38
  39     long physicalMem = getPhysicalMemory();
  40     if (physicalMem > MemorySetting.applicationMinMemory)
  41     {
  42       // try and set at least applicationMinMemory and thereafter ensure
  43       // leaveFreeMinMemory is left for the OS
  44       memPercent = Math.max(MemorySetting.applicationMinMemory,
  45               (long) (physicalMem
  46                       - Math.max(physicalMem * (100 - percent) / 100,
  47                               MemorySetting.leaveFreeMinMemory)));
  48     }
  49
  50     return memPercent;
  51   }
  52
  53 }