8 Replies Latest reply on Mar 19, 2011 5:37 AM by himanshu.gautam

    OpenCL on Ubuntu-machine without graphics card

      I installed the 2.3-sdk, but only platform reported is an NVIDIA platform.

      I want to test my Intel multi-core CPU for OpenCL programming, so I installed the v2.3-sdk, but without having an ATI graphics card installed. When I run the CLInfo sample program, it only reports one platform found, namely one for "OpenCL 1.0 CUDA 3.2.1". (There is a GeForce card in the computer.)

      Does this mean that I should install an ATI driver (for a graphics card?) in order for the OpenCL functions to find the CPU-platform?

      (Or do I have to actually have an ATI card in the machine because the CPU will only show up as a device inside an "ATI-platform" in OpenCL?)



        • OpenCL on Ubuntu-machine without graphics card

          Although Intel CPUs are not officially supported. Generally you should be able to see CPU platform by just installing SDK.

          What did you installed first, AMD APP SDK or NV Driver ? Some old NV frivers were known to be creating problems of thie kind.

          Is there any reason why you are not trying intel's SDK?

            • OpenCL on Ubuntu-machine without graphics card

              I had the Nvidia driver already installed, it is rather fresh, version 260.19.36, then I installed the AMD app sdk.

              Thanks for the Intel suggestion, I was not aware they had an SDK for OpenCL at all! Will look into that.




              • OpenCL on Ubuntu-machine without graphics card

                because Intel implemtation is currently Windows only? but yes older nVidia drivers are incompatible.

                do you properly register ICD into /etc/OpenCL/vendors? and try replace libOpenCL.so with that which is in APP SDK.

                  • OpenCL on Ubuntu-machine without graphics card

                    Ah! Missed the ubuntu.

                    In that case AMD SDK is the only option.

                    Thanks nou.

                      • OpenCL on Ubuntu-machine without graphics card

                        Aha, so Intel is Windows-only, that's a pity... But the tip about libOpenCL.so was good, turns out that the Nvidia-version was being used, and only reported its own platform, while the AMD-version detects both. 

                        It does crash when it is about to look for devices in the ATI-platform, but I guess that must be something else then. At least now I believe that it will work in the end...



                        Number of platforms:                             2

                          Platform Profile:                              FULL_PROFILE

                          Platform Version:                              OpenCL 1.0 CUDA 3.2.1

                          Platform Name:                                 NVIDIA CUDA

                          Platform Vendor:                               NVIDIA Corporation

                          Platform Extensions:                           cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll 

                          Platform Profile:                              FULL_PROFILE

                          Platform Version:                              OpenCL 1.1 ATI-Stream-v2.3 (451)

                          Platform Name:                                 ATI Stream

                          Platform Vendor:                               Advanced Micro Devices, Inc.

                          Platform Extensions:                           cl_khr_icd cl_amd_event_callback cl_amd_offline_devices



                          Platform Name:                                 NVIDIA CUDA

                        Number of devices:                               1

                          Device Type:                                   CL_DEVICE_TYPE_GPU

                          Device ID:                                     4318

                          Max compute units:                             12

                          Max work items dimensions:                     3

                            Max work items[0]:                           512

                            Max work items[1]:                           512

                            Max work items[2]:                           64

                          Max work group size:                           512

                          Preferred vector width char:                   1

                          Preferred vector width short:                  1

                          Preferred vector width int:                    1

                          Preferred vector width long:                   1

                          Preferred vector width float:                  1

                          Preferred vector width double:                 0

                        ERROR: clgetDeviceInfo(-30)