Package org.lwjgl.util.mapped

Class 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 Detail

      • 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