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编辑:问题解决了!rzymek 的回答很有帮助。

问题:对于 JOCL,如何通过设备裂变从 opencl 计算中排除一些 CPU 内核?(cl_device_partition_property 的 Java 端口在 0.1.9 版本中似乎已损坏)

编辑:我发现了这个:

clCreateSubDevices(devices[0][1],core , 1, cpuCores, coreIDs);

但 java/jocl 不接受这个:

cl_device_partition_property core=CL.CL_DEVICE_PARTITION_BY_COUNTS;

错误是:

Type mismatch: cannot convert from int to cl_device_partition_property

刚刚尝试空初始化,然后使用变量自己的方法来设置属性:

    cl_device_partition_property core = null;
    core.addProperty(CL_DEVICE_PARTITION_BY_COUNTS, platforms[0]);

编辑:现在它给出了

    java.lang.NullPointerException,

错误。

IT 需要是 unsigned int(不是 cl_device_partition_property),但 java 没有。

使用构造函数的新尝试:

cl_device_partition_property core = new cl_device_partition_property();

错误:

 A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000007fedb6500bf, pid=4952, tid=4852
#
# JRE version: 7.0_21-b11
# Java VM: Java HotSpot(TM) 64-Bit Server VM (23.21-b01 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# C  [amdocl64.dll+0x1800bf]  clGetSamplerInfo+0x1972f
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of     Windows
#
# An error report file with more information is saved as:
# C:\javalar\buraya\paralelProje\hs_err_pid4952.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

[error occurred during error reporting , id 0xc0000005]

另一个尝试:

    cl_device_partition_property core =  (CL_UNSIGNED_INT32)CL_DEVICE_PARTITION_BY_COUNTS;

错误:

CL_UNSIGNED_INT32 cannot be resolved to a type

这也不起作用:

   Pointer xyz=Pointer.to(core); // jocl's pointer type.
   clCreateSubDevices(device,xyz, 1, cpuCores, coreIDs);

编辑:问题解决了!谢谢。现在可以分区我的cpu:

在此处输入图像描述

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1 回答 1

1

我认为这是 JOCL 缺少的功能。我认为您可以尝试这两种解决方法。

假设您要设置此属性列表:

{ CL_DEVICE_PARTITION_BY_COUNTS, 3, 1, CL_DEVICE_PARTITION_BY_COUNTS_LIST_END, 0 }

(取自http://software.intel.com/en-us/articles/opencl-device-fission-for-cpu-performance上的属性列表示例)。

解决方法 1

cl_device_partition_property properties = new cl_device_partition_property();
properties.addProperty(CL.CL_DEVICE_PARTITION_BY_COUNTS, 3);
properties.addProperty(1, CL.CL_DEVICE_PARTITION_BY_COUNTS_LIST_END);

说明: addProperty 方法只是将 id 和 value 都附加到 long[] 数组的末尾并将其转换为 Buffer:

public void addProperty(long id, long value)
{
    LongBuffer oldBuffer = (LongBuffer)getBuffer();
    long newArray[] = new long[oldBuffer.capacity()+2];
    oldBuffer.get(newArray, 0, oldBuffer.capacity());
    newArray[oldBuffer.capacity()-1] = id;
    newArray[oldBuffer.capacity()+0] = value;
    newArray[oldBuffer.capacity()+1] = 0;
    setBuffer(LongBuffer.wrap(newArray));
}

所以任何列表都可以像这样创建:

addProperty(item[0], item[1]);
addProperty(item[2], item[3]);
addProperty(item[4], item[5]);
addProperty(item[6], 0);

解决方法 2:

在包中创建一个类org.jcol以访问受限方法setBuffer

package org.jocl;

import java.nio.LongBuffer;

public class cl_device_partition_property_gateway {
    public static void set(cl_device_partition_property properties, long[] newArray) {
        properties.setBuffer(LongBuffer.wrap(newArray));
    }
}

然后可以直接设置 long[] 数组:

cl_device_partition_property properties = new cl_device_partition_property();
long[] values = { CL.CL_DEVICE_PARTITION_BY_COUNTS, 3, 1, 
    CL.CL_DEVICE_PARTITION_BY_COUNTS_LIST_END, 0 };
cl_device_partition_property_gateway.set(properties, values);
于 2013-05-22T13:44:18.530 回答