another small issue about ogmaneo HOT 6 CLOSED

i am back at this one.
is my card not supported?

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[andrewcz@andrewcz-pc Python]$ python WavyDemo.py
OgmaNeo version: 1.4.2
Found 2 platform(s).
Platform 0: Intel(R) OpenCL
Platform 1: Intel Gen OCL Driver
Using platform: Intel Gen OCL Driver

Found 1 device(s).
Device 0: Intel(R) HD Graphics 5500 BroadWell U-Processor GT2
Using device: Intel(R) HD Graphics 5500 BroadWell U-Processor GT2

Segmentation fault (core dumped)
[andrewcz@andrewcz-pc Python]$

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@andrewcz Your card is supported. I use an Intel HD 5xx series GPU for testing the library and demos (albeit using Windows drivers).

Getting to the point of running the Python scripts, and it displaying the OgmaNeo version, shows that you have an OpenCL SDK installed ok and OgmaNeo library and bindings building ok.

There are two things you can do to help diagnose the seg-fault:

1. Tell OgmaNeo to use a CPU rather than a GPU. That involves finding the following line in the Python scripts res.create(ogmaneo.ComputeSystem._gpu) and changing _gpu to _cpu
2. Use the clinfo executable (likely need to sudo apt install clinfo) to ask OpenCL on you system what platforms and devices exist, and importantly what they are capable of.

Be aware that the first option may still seg-fault. The potential cause here is lack of up-to-date/generic graphics drivers. It'd be great if you can post here the log produced by the ./clinfo command.

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[andrewcz@andrewcz-pc ~]$ clinfo
Number of platforms 2
Platform Name Intel(R) OpenCL
Platform Vendor Intel(R) Corporation
Platform Version OpenCL 2.0
Platform Profile FULL_PROFILE
Platform Extensions cl_khr_3d_image_writes cl_khr_byte_addressable_store cl_khr_depth_images cl_khr_fp64 cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_icd cl_khr_image2d_from_buffer cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_spir
Platform Extensions function suffix INTEL

Platform Name Intel Gen OCL Driver
Platform Vendor Intel
Platform Version OpenCL 2.0 beignet 1.3
Platform Profile FULL_PROFILE
Platform Extensions cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_byte_addressable_store cl_khr_3d_image_writes cl_khr_image2d_from_buffer cl_khr_depth_images cl_khr_spir cl_khr_icd cl_intel_accelerator cl_intel_subgroups cl_intel_subgroups_short cl_khr_gl_sharing
Platform Extensions function suffix Intel

Platform Name Intel(R) OpenCL
Number of devices 2
Device Name Intel(R) HD Graphics
Device Vendor Intel(R) Corporation
Device Vendor ID 0x8086
Device Version OpenCL 2.0
Driver Version r4.1.61547
Device OpenCL C Version OpenCL C 2.0
Device Type GPU
Device Available Yes
Device Profile FULL_PROFILE
Max compute units 24
Max clock frequency 900MHz
Device Partition (core)
Max number of sub-devices 0
Supported partition types None
Max work item dimensions 3
Max work item sizes 256x256x256
Max work group size 256
Compiler Available Yes
Linker Available Yes
Segmentation fault (core dumped)
[andrewcz@andrewcz-pc ~]$

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[andrewcz@andrewcz-pc Python]$ python Example.py
OgmaNeo version: 1.4.2
Found 2 platform(s).
Platform 0: Intel(R) OpenCL
Platform 1: Intel Gen OCL Driver
Using platform: Intel Gen OCL Driver

Found 1 device(s).
Device 0: Intel(R) HD Graphics 5500 BroadWell U-Processor GT2
Using device: Intel(R) HD Graphics 5500 BroadWell U-Processor GT2

Stepping the hierarchy...
Segmentation fault (core dumped)
[andrewcz@andrewcz-pc Python]$

when i changed it to

Tell OgmaNeo to use a CPU rather than a GPU. That involves finding the following line in the Python scripts res.create(ogmaneo.ComputeSystem._gpu) and changing _gpu to _cpu

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@andrewcz Yeah the clinfo seg-fault certainly shows that something isn't correct with your OpenCL drivers (part of a GPU driver package). It should show quite a bit more information about the capabilities of your OpenCL devices.
By default the res.create() call sets a second and third parameter [1] to -1 and that forces OgmaNeo to use the highest platform and device. So you can try using res.create(ogmaneo.ComputeSystem._gpu, 0, 0), for example.
But your original post and clinfo failure points at some problem with your graphics driver installation. Other than making sure that your driver (and kernel?) is up to date, the only other thing to suggest is to use our more recent EOgmaNeo library that doesn't rely on OpenCL/GPU.

1 https://github.com/ogmacorp/OgmaNeo/blob/master/source/system/ComputeSystem.cpp#L15

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