Class KernelManager


  • public class KernelManager
    extends java.lang.Object
    Created by Barney on 24/08/2015.
    • Constructor Detail

      • KernelManager

        protected KernelManager()
    • Method Detail

      • setup

        protected void setup()
        Default KernelManager initialization.
        Convenience method for being overridden to an empty implementation, so that derived KernelManager classes can provide non static parameters to their constructors.
      • setKernelManager

        public static void setKernelManager​(KernelManager manager)
      • sharedKernelInstance

        public static <T extends Kernel> T sharedKernelInstance​(java.lang.Class<T> kernelClass)
        This method returns a shared instance of a given Kernel subclass. The kernelClass needs a no-args constructor, which need not be public.

        Each new Kernel instance requires a new JNIContext, the creation of which is expensive. There is apparently no simple solution by which a cached JNIContext can be reused for all instances of a given Kernel class, since it is intimately connected with resource aquisition and release. In the absence of a context caching solution, it is often highly desirable to only ever create one instance of any given Kernel subclass, which this method facilitates.

        In order to maintain thread saftey when using a shared instance, it is necessary to synchronize on the returned kernel for the duration of the process of setting up, executing and extracting the results from that kernel.

        This method instantiates a Kernel (per Kernel class) via Reflection, and thus can only be used where the Kernel class has a no-args constructor, which need not be public. In fact, if a Kernel subclass is designed to be used in conjunction with this method, it is recommended that its only constructor is a private no-args constructor.

        Throws:
        java.lang.RuntimeException - if the class cannot be instantiated
      • reportDeviceUsage

        public void reportDeviceUsage​(java.lang.StringBuilder builder,
                                      boolean withProfilingInfo)
        Append a report to builder which contains information, per Kernel subclass, on which device is currently being used for the kernel class, and which (if any) devices failed to execute a given Kernel.
      • reportProfilingSummary

        public void reportProfilingSummary​(java.lang.StringBuilder builder)
      • setPreferredDevices

        public void setPreferredDevices​(Kernel _kernel,
                                        java.util.LinkedHashSet<Device> _devices)
      • setDefaultPreferredDevices

        public void setDefaultPreferredDevices​(java.util.LinkedHashSet<Device> _devices)
      • getSharedKernelInstance

        private <T extends Kernel> T getSharedKernelInstance​(java.lang.Class<T> kernelClass)
      • createDefaultPreferredDevices

        protected java.util.LinkedHashSet<Device> createDefaultPreferredDevices()
      • getPreferredDeviceTypes

        protected java.util.List<Device.TYPE> getPreferredDeviceTypes()
      • getDefaultAcceleratorComparator

        protected java.util.Comparator<OpenCLDevice> getDefaultAcceleratorComparator()
        NB, returns -ve for the better device.
      • getDefaultGPUComparator

        protected java.util.Comparator<OpenCLDevice> getDefaultGPUComparator()
        NB, returns -ve for the better device.
      • bestDevice

        public Device bestDevice()
      • selectLhsIfCUDA

        protected static boolean selectLhsIfCUDA​(OpenCLDevice _deviceLhs,
                                                 OpenCLDevice _deviceRhs)
        NVidia/CUDA architecture reports maxComputeUnits in a completely different context, i.e. maxComputeUnits is not same as (is much less than) the number of OpenCL cores available.

        Therefore when comparing an NVidia device we use different criteria.

      • getProfile

        public KernelProfile getProfile​(java.lang.Class<? extends Kernel> kernelClass)