Module openj9.sharedclasses
Package com.ibm.oti.shared

Class SharedClassStatistics

  • public class SharedClassStatistics
extends Object
    SharedClassStatistics provides static functions that report basic cache statistics.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static String cacheDir()
      Returns the cache directory.
      static String cacheName()
      Returns the cache name.
      static String cachePath()
      Returns the full cache path.
      static long freeSpaceBytes()
      Returns the free space of the shared cache that the JVM is currently connected to.
      static long maxAotBytes()
      Returns the maximum space allowed for AOT data of the cache that the JVM is currently connected to.
      static long maxJitDataBytes()
      Returns the maximum space allowed for JIT data of the cache that the JVM is currently connected to.
      static long maxSizeBytes()
      Returns the size of the shared cache that the JVM is currently connected to.
      static long minAotBytes()
      Returns the minimum space reserved for AOT data of the cache that the JVM is currently connected to.
      static long minJitDataBytes()
      Returns the minimum space reserved for JIT data of the cache that the JVM is currently connected to.
      static long numberAttached()
      Returns the SysV shmem nattch value for a non-persistent top level cache.
      static long softmxBytes()
      Returns the soft limit in bytes for the available space of the cache that the JVM is currently connected to.

    • Constructor Detail

      • SharedClassStatistics

        @Deprecated
public SharedClassStatistics()
        Deprecated.
        Constructs a new instance of this class.

    • Method Detail

      • maxSizeBytes

        public static long maxSizeBytes()
        Returns the size of the shared cache that the JVM is currently connected to.
        Returns:
        the total size in bytes

      • freeSpaceBytes

        public static long freeSpaceBytes()
        Returns the free space of the shared cache that the JVM is currently connected to.
        Returns:
        the free space in bytes

      • softmxBytes

        public static long softmxBytes()
        Returns the soft limit in bytes for the available space of the cache that the JVM is currently connected to.
        Returns:
        the soft max size or cache size in bytes if it is not set

      • minAotBytes

        public static long minAotBytes()
        Returns the minimum space reserved for AOT data of the cache that the JVM is currently connected to.
        Returns:
        the minimum shared classes cache space reserved for AOT data in bytes or -1 if it is not set

      • maxAotBytes

        public static long maxAotBytes()
        Returns the maximum space allowed for AOT data of the cache that the JVM is currently connected to.
        Returns:
        the maximum shared classes cache space allowed for AOT data in bytes or -1 if it is not set

      • minJitDataBytes

        public static long minJitDataBytes()
        Returns the minimum space reserved for JIT data of the cache that the JVM is currently connected to.
        Returns:
        the minimum shared classes cache space reserved for JIT data in bytes or -1 if it is not set

      • maxJitDataBytes

        public static long maxJitDataBytes()
        Returns the maximum space allowed for JIT data of the cache that the JVM is currently connected to.
        Returns:
        the maximum shared classes cache space allowed for JIT data in bytes or -1 if it is not set

      • numberAttached

        public static long numberAttached()
        Returns the SysV shmem nattch value for a non-persistent top level cache.

        On Windows or for persistent caches, -1 is returned. Depending on the platform and OS, such as z/OS, the value indicates the number of JVMs attached to the cache.

        Returns:
        the SysV shmem nattch value for a top level non-persistent cache, or -1 if it cannot be determined

      • cachePath

        public static String cachePath()
        Returns the full cache path.
        Returns:
        the full cache path, or NULL if it cannot be determined

      • cacheName

        public static String cacheName()
        Returns the cache name.
        Returns:
        the cache name, or NULL if it cannot be determined

      • cacheDir

        public static String cacheDir()
        Returns the cache directory.
        Returns:
        the cache directory, or NULL if it cannot be determined