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2013-01-20T17:46:43.193
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2013-12-13T18:45:55.340
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2013-12-13T18:45:55.340
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OpenCL host APIs allow you to specify the the the number of devices when you get the device ids list <pre><code>_int clGetDeviceIDs( cl_platform_id platform, cl_device_type device_type, cl_uint num_entries, // Controls the minimum number of devices cl_device_id *devices, cl_uint *num_devices) </code></pre> The device id pointer *devices can be used to create the context with a specific number of devices. Here is what the spec says <blockquote> num_entries is the number of cl_device entries that can be added to devices. If devices is not NULL, the num_entries must be greater than zero. devices returns a list of OpenCL devices found. The cl_device_id values returned in devices can be used to identify a specific OpenCL device. If devices argument is NULL, this argument is ignored. The number of OpenCL devices returned is the minimum of the value specified by num_entries or the number of OpenCL devices whose type matches device_type. num_devices returns the number of OpenCL devices available that match device_type. If num_devices is NULL, this argument is ignored </blockquote> <pre><code>cl_context clCreateContext( const cl_context_properties *properties, cl_uint num_devices, // Number of devices const cl_device_id *devices, (voidCL_CALLBACK *pfn_notify) ( const char *errinfo, const void *private_info, size_t cb, void *user_data ), void *user_data, cl_int *errcode_ret) </code></pre> Each device is then addressed through its own device queue.
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1. PORestrict number of GPUs for AMD OpenCL
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1. COI know all of this. Maybe I wasn't entirely clear, but I was looking for a way to control the devices from "outside". Similar to the environment variable provided by the NVIDIA CUDA driver.
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2. COOK, great! Then invent your own environment variable or use the CUDA one and call GetEnv(). You should know how to do the rest ....
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