package jalview.bin;
-import java.lang.management.ManagementFactory;
-import java.lang.management.OperatingSystemMXBean;
-
public class MemorySetting
{
public static final long leaveFreeMinMemory = 536870912; // 0.5 GB
public static final long applicationMinMemory = 536870912; // 0.5 GB
- protected static long getPhysicalMemory()
+ private final static int maxHeapSizePerCentDefault = 90;
+
+ public final static String maxHeapSizePerCentProperty = "jvmmempc";
+
+ private final static long maxHeapSizeDefault = 34359738368L; // 32GB
+
+ private final static long noMemMaxHeapSizeDefault = 8589934592L; // 8GB
+
+ public final static String maxHeapSizeProperty = "jvmmemmax";
+
+ public static long getMemorySetting()
{
- final OperatingSystemMXBean o = ManagementFactory
- .getOperatingSystemMXBean();
+ return getMemorySetting(null, null);
+ }
- try
+ public static long getMemorySetting(String jvmmemmaxString,
+ String jvmmempcString)
+ {
+ // actual Xmx value-to-be
+ long maxMemLong = -1;
+
+ // get (absolute) jvmmaxmem setting
+ long memmax = maxHeapSizeDefault;
+ String jvmmemmaxorig = jvmmemmaxString;
+ if (jvmmemmaxorig == null)
+ {
+ jvmmemmaxorig = System.getProperty(maxHeapSizeProperty);
+ }
+ String jvmmemmax = jvmmemmaxorig;
+ if (jvmmemmax != null && jvmmemmax.length() > 0)
{
- if (o instanceof com.sun.management.OperatingSystemMXBean)
+ long multiplier = 1;
+ switch (jvmmemmax.toLowerCase().substring(jvmmemmax.length() - 1))
+ {
+ case "t":
+ multiplier = 1099511627776L; // 2^40
+ jvmmemmax = jvmmemmax.substring(0, jvmmemmax.length() - 1);
+ break;
+ case "g":
+ multiplier = 1073741824; // 2^30
+ jvmmemmax = jvmmemmax.substring(0, jvmmemmax.length() - 1);
+ break;
+ case "m":
+ multiplier = 1048576; // 2^20
+ jvmmemmax = jvmmemmax.substring(0, jvmmemmax.length() - 1);
+ break;
+ case "k":
+ multiplier = 1024; // 2^10
+ jvmmemmax = jvmmemmax.substring(0, jvmmemmax.length() - 1);
+ break;
+ case "b":
+ multiplier = 1; // 2^0
+ jvmmemmax = jvmmemmax.substring(0, jvmmemmax.length() - 1);
+ break;
+ default:
+ break;
+ }
+
+ // parse the arg
+ try
+ {
+ memmax = Long.parseLong(jvmmemmax);
+ } catch (NumberFormatException e)
+ {
+ memmax = maxHeapSizeDefault;
+ System.out.println("MemorySetting Property '" + maxHeapSizeProperty
+ + "' ("
+ + jvmmemmaxorig + "') badly formatted, using default ("
+ + memmax + ").");
+ }
+
+ // apply multiplier if not too big (i.e. bigger than a long)
+ if (Long.MAX_VALUE / memmax < multiplier)
+ {
+ memmax = maxHeapSizeDefault;
+ System.out.println(
+ "MemorySetting Property '" + maxHeapSizeProperty + "' ("
+ + jvmmemmaxorig
+ + ") too big, using default (" + memmax + ").");
+ }
+ else
+ {
+ memmax = multiplier * memmax;
+ }
+
+ // check at least minimum value (this accounts for negatives too)
+ if (memmax < MemorySetting.applicationMinMemory)
{
- final com.sun.management.OperatingSystemMXBean osb = (com.sun.management.OperatingSystemMXBean) o;
- return osb.getTotalPhysicalMemorySize();
+ memmax = MemorySetting.applicationMinMemory;
+ System.out.println(
+ "MemorySetting Property '" + maxHeapSizeProperty + "' ("
+ + jvmmemmaxorig
+ + ") too small, using minimum (" + memmax + ").");
}
- } catch (NoClassDefFoundError e)
+
+ }
+ else
{
- // com.sun.management.OperatingSystemMXBean doesn't exist in this JVM
- System.err.println("No com.sun.management.OperatingSystemMXBean");
+ // no need to warn if no setting
+ // System.out.println("MemorySetting Property '" + maxHeapSizeProperty + "' not
+ // set.");
}
- // We didn't get a com.sun.management.OperatingSystemMXBean.
- return -1;
- }
+ // get max percent of physical memory
+ float percent = maxHeapSizePerCentDefault;
+ String jvmmempc = jvmmempcString;
+ if (jvmmempc == null)
+ {
+ jvmmempc = System.getProperty(maxHeapSizePerCentProperty);
+ }
+ long pcmem = -1;
+ try
+ {
+ if (jvmmempc != null)
+ {
+ float trypercent = Float.parseFloat(jvmmempc);
+ if (0 < trypercent && trypercent <= 100f)
+ {
+ percent = trypercent;
+ }
+ else
+ {
+ System.out.println(
+ "MemorySetting Property '" + maxHeapSizePerCentProperty
+ + "' should be in range 1..100");
+ }
+ }
+ } catch (NumberFormatException e)
+ {
+ System.out.println(
+ "MemorySetting property '" + maxHeapSizePerCentProperty
+ + "' (" + jvmmempc + ") badly formatted");
+ }
- public static long memPercent(int percent)
- {
- long memPercent = -1;
+ // catch everything in case of no com.sun.management.OperatingSystemMXBean
+ boolean memoryPercentError = false;
+ try
+ {
+ pcmem = MemoryPercent.memPercent(percent);
+ } catch (Throwable t)
+ {
+ memoryPercentError = true;
+ System.out.println("Problem calling MemoryPercent.memPercent("
+ + percent
+ + "). Likely to be problem with com.sun.management.OperatingSystemMXBean");
+ t.printStackTrace();
+ }
+ // In the case of an error reading the percentage if physical memory, let's cap maxMemLong to 8GB
+ if (memoryPercentError && jvmmempc != null && pcmem == -1
+ && memmax > noMemMaxHeapSizeDefault)
+ {
+ System.out.println(
+ "Capping maximum memory to 8GB due to failure to read physical memory size.");
+ memmax = noMemMaxHeapSizeDefault;
+ }
- long physicalMem = getPhysicalMemory();
- if (physicalMem > applicationMinMemory)
+ if (pcmem == -1) // not set
+ {
+ maxMemLong = memmax;
+ }
+ else
{
- // try and set at least applicationMinMemory and thereafter ensure
- // leaveFreeMinMemory is left for the OS
- memPercent = Math.max(applicationMinMemory,
- physicalMem - Math.max(physicalMem * (100 - percent) / 100,
- leaveFreeMinMemory));
+ maxMemLong = Math.min(pcmem, memmax);
}
- return memPercent;
+ return maxMemLong;
}
}
git://source.jalview.org / jalview.git / blobdiff