Package org.lwjgl.util.mapped

Class CacheUtil

java.lang.Object
org.lwjgl.util.mapped.CacheUtil
public final class CacheUtil extends Object
This class provides utility methods for allocating cache-line-aligned NIO buffers. The CPU cache line size is detected using a micro-benchmark that exploits the performation degredation that occurs when different threads write to different locations of the same cache line. The detection should be reasonably robust on both the server and client VM, but there are a few system properties that can be used to tune it.
Author:
Spasi

  • Method Details

    • getCacheLineSize

      public static int getCacheLineSize()
      Returns the CPU cache line size, in number of bytes.
      Returns:
      the cache line size

    • createByteBuffer

      public static ByteBuffer createByteBuffer(int size)
      Construct a direct, native-ordered and cache-line-aligned bytebuffer with the specified size.
      Parameters:
      size - The size, in bytes
      Returns:
      a ByteBuffer

    • createShortBuffer

      public static ShortBuffer createShortBuffer(int size)
      Construct a direct, native-ordered and cache-line-aligned shortbuffer with the specified number of elements.
      Parameters:
      size - The size, in shorts
      Returns:
      a ShortBuffer

    • createCharBuffer

      public static CharBuffer createCharBuffer(int size)
      Construct a direct, native-ordered and cache-line-aligned charbuffer with the specified number of elements.
      Parameters:
      size - The size, in chars
      Returns:
      an CharBuffer

    • createIntBuffer

      public static IntBuffer createIntBuffer(int size)
      Construct a direct, native-ordered and cache-line-aligned intbuffer with the specified number of elements.
      Parameters:
      size - The size, in ints
      Returns:
      an IntBuffer

    • createLongBuffer

      public static LongBuffer createLongBuffer(int size)
      Construct a direct, native-ordered and cache-line-aligned longbuffer with the specified number of elements.
      Parameters:
      size - The size, in longs
      Returns:
      an LongBuffer

    • createFloatBuffer

      public static FloatBuffer createFloatBuffer(int size)
      Construct a direct, native-ordered and cache-line-aligned floatbuffer with the specified number of elements.
      Parameters:
      size - The size, in floats
      Returns:
      a FloatBuffer

    • createDoubleBuffer

      public static DoubleBuffer createDoubleBuffer(int size)
      Construct a direct, native-ordered and cache-line-aligned doublebuffer with the specified number of elements.
      Parameters:
      size - The size, in floats
      Returns:
      a FloatBuffer

    • createPointerBuffer

      public static PointerBuffer createPointerBuffer(int size)
      Construct a cache-line-aligned PointerBuffer with the specified number of elements.
      Parameters:
      size - The size, in memory addresses
      Returns:
      a PointerBuffer