182 lines
6.3 KiB
Java
182 lines
6.3 KiB
Java
//******************************************************************************
|
|
//
|
|
// File: GpuLongArray.java
|
|
// Package: edu.rit.gpu
|
|
// Unit: Class edu.rit.gpu.GpuLongArray
|
|
//
|
|
// This Java source file is copyright (C) 2014 by Alan Kaminsky. All rights
|
|
// reserved. For further information, contact the author, Alan Kaminsky, at
|
|
// ark@cs.rit.edu.
|
|
//
|
|
// This Java source file is part of the Parallel Java 2 Library ("PJ2"). PJ2 is
|
|
// free software; you can redistribute it and/or modify it under the terms of
|
|
// the GNU General Public License as published by the Free Software Foundation;
|
|
// either version 3 of the License, or (at your option) any later version.
|
|
//
|
|
// PJ2 is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
|
|
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
|
|
//
|
|
// A copy of the GNU General Public License is provided in the file gpl.txt. You
|
|
// may also obtain a copy of the GNU General Public License on the World Wide
|
|
// Web at http://www.gnu.org/licenses/gpl.html.
|
|
//
|
|
//******************************************************************************
|
|
|
|
package edu.rit.gpu;
|
|
|
|
/**
|
|
* Class GpuLongArray provides a long integer array GPU variable. This is an
|
|
* array of type <TT>long</TT> stored in the GPU's memory and mirrored in the
|
|
* CPU's memory.
|
|
* <P>
|
|
* Class GpuLongArray supports mirroring all of the GPU's data array in the
|
|
* CPU's memory, mirroring only a portion of the GPU's data array in the CPU's
|
|
* memory, or mirroring none of the GPU's data array. Class GpuLongArray
|
|
* provides operations for copying all or portions of the data array from the
|
|
* CPU to the GPU or from the GPU to the CPU.
|
|
* <P>
|
|
* To use a long integer array GPU variable:
|
|
* <OL TYPE=1>
|
|
* <P><LI>
|
|
* Construct an instance of class GpuLongArray by calling either the {@link
|
|
* Gpu#getLongArray(int) getLongArray()} method on a {@linkplain Gpu Gpu} object
|
|
* or the {@link Module#getLongArray(String,int) getLongArray()} method on a
|
|
* {@linkplain Module Module} object, specifying the length of the array and
|
|
* (optionally) the length of the array portion mirrored in the CPU.
|
|
* <P><LI>
|
|
* Set the {@link #item item} field's elements to the desired values. Call the
|
|
* {@link #hostToDev() hostToDev()} method to copy the mirrored portion of the
|
|
* array from CPU memory to GPU memory.
|
|
* <P><LI>
|
|
* Pass the GpuLongArray object as an argument of a GPU kernel function call. In
|
|
* the GPU code, this becomes a pointer (type <TT>long long int*</TT> or
|
|
* <TT>unsigned long long int*</TT>) to an array of <I>N</I> data elements,
|
|
* where <I>N</I> is the length of the array. The GPU code sets the array's
|
|
* elements to the desired values.
|
|
* <P><LI>
|
|
* Call the {@link #devToHost() devToHost()} method to copy the mirrored portion
|
|
* of the array from GPU memory to CPU memory. Examine the values of the {@link
|
|
* #item item} field's elements.
|
|
* </OL>
|
|
*
|
|
* @author Alan Kaminsky
|
|
* @version 03-Apr-2014
|
|
*/
|
|
public class GpuLongArray
|
|
extends GpuArray
|
|
{
|
|
|
|
// Exported data members.
|
|
|
|
/**
|
|
* The mirrored portion of the long integer array in CPU memory.
|
|
*/
|
|
public final long[] item;
|
|
|
|
// Hidden constructors.
|
|
|
|
/**
|
|
* Construct a new dynamically allocated GPU long integer array.
|
|
*
|
|
* @param gpu Gpu object.
|
|
* @param len Number of elements in GPU memory.
|
|
* @param cpulen Number of elements mirrored in CPU memory.
|
|
*
|
|
* @exception GpuException
|
|
* (unchecked exception) Thrown if a GPU error occurred.
|
|
*/
|
|
GpuLongArray
|
|
(Gpu gpu,
|
|
int len,
|
|
int cpulen)
|
|
{
|
|
super (gpu, len, 8L*len, cpulen);
|
|
item = new long [cpulen];
|
|
}
|
|
|
|
/**
|
|
* Construct a new statically allocated GPU long integer array.
|
|
*
|
|
* @param gpu Gpu object.
|
|
* @param len Number of elements in GPU memory.
|
|
* @param cpulen Number of elements mirrored in CPU memory.
|
|
* @param dptr Pointer to array in GPU memory.
|
|
*
|
|
* @exception GpuException
|
|
* (unchecked exception) Thrown if a GPU error occurred.
|
|
*/
|
|
GpuLongArray
|
|
(Gpu gpu,
|
|
int len,
|
|
int cpulen,
|
|
long dptr)
|
|
{
|
|
super (gpu, len, 8L*len, cpulen, dptr);
|
|
item = new long [cpulen];
|
|
}
|
|
|
|
// Exported operations.
|
|
|
|
/**
|
|
* Copy the given portion of this GPU array from the host CPU's memory to
|
|
* the GPU device's memory. <TT>len</TT> elements starting at index
|
|
* <TT>srcindex</TT> in the CPU array are copied to the GPU array starting
|
|
* at index <TT>dstindex</TT>.
|
|
*
|
|
* @param dstindex GPU array starting index.
|
|
* @param srcindex CPU array starting index.
|
|
* @param len Number of elements to copy.
|
|
*
|
|
* @exception IndexOutOfBoundsException
|
|
* (unchecked exception) Thrown if <TT>dstindex</TT> < 0,
|
|
* <TT>srcindex</TT> < 0, <TT>len</TT> < 0, <TT>dstindex+len</TT>
|
|
* > <TT>length()</TT>, or <TT>srcindex+len</TT> >
|
|
* <TT>cpuLength()</TT>.
|
|
* @exception GpuException
|
|
* (unchecked exception) Thrown if a GPU error occurred.
|
|
*/
|
|
public void hostToDev
|
|
(int dstindex,
|
|
int srcindex,
|
|
int len)
|
|
{
|
|
if (dstindex < 0 || srcindex < 0 || len < 0 ||
|
|
dstindex + len > this.len || srcindex + len > cpulen)
|
|
throw new IndexOutOfBoundsException();
|
|
if (len > 0)
|
|
Cuda.cuMemcpyHtoD (gpu.ctx, dptr, dstindex, item, srcindex, len);
|
|
}
|
|
|
|
/**
|
|
* Copy the given portion of this GPU array from the GPU device's memory to
|
|
* the host CPU's memory. <TT>len</TT> elements copied starting at index
|
|
* <TT>srcindex</TT> in the GPU array are copied to the CPU array starting
|
|
* at index <TT>dstindex</TT>.
|
|
*
|
|
* @param dstindex CPU array starting index.
|
|
* @param srcindex GPU array starting index.
|
|
* @param len Number of elements to copy.
|
|
*
|
|
* @exception IndexOutOfBoundsException
|
|
* (unchecked exception) Thrown if <TT>dstindex</TT> < 0,
|
|
* <TT>srcindex</TT> < 0, <TT>len</TT> < 0, <TT>dstindex+len</TT>
|
|
* > <TT>cpuLength()</TT>, or <TT>srcindex+len</TT> >
|
|
* <TT>length()</TT>.
|
|
* @exception GpuException
|
|
* (unchecked exception) Thrown if a GPU error occurred.
|
|
*/
|
|
public void devToHost
|
|
(int dstindex,
|
|
int srcindex,
|
|
int len)
|
|
{
|
|
if (dstindex < 0 || srcindex < 0 || len < 0 ||
|
|
dstindex + len > cpulen || srcindex + len > this.len)
|
|
throw new IndexOutOfBoundsException();
|
|
if (len > 0)
|
|
Cuda.cuMemcpyDtoH (gpu.ctx, item, dstindex, dptr, srcindex, len);
|
|
}
|
|
|
|
}
|