Hi Jan,

Could you provide your kernel or the reproduce codes?

Thanks
Xiuli

(In reply to Xiuli Pan from comment #1)
> Hi Jan,
> 
> Could you provide your kernel or the reproduce codes?
> 
> Thanks
> Xiuli

Hi,

the pixelize kernel is here:
https://git.gnome.org/browse/gegl/tree/opencl/pixelize.cl

compiling gegl and running:

OCL_ICD_VENDORS=/etc/OpenCL/vendors/intel-beignet.icd GEGL_DEBUG=opencl GEGL_PATH="./operations" LD_LIBRARY_PATH="$LD_LIBRARY_PATH:./gegl/.libs/" ./bin/.libs/gegl tests/compositions/pixelize.xml
triggers the hang

the pixelize test:
https://git.gnome.org/browse/gegl/tree/tests/compositions/pixelize.xml

removing the crop operation still triggers GPU HANG

Hi Jan,

I have face some problems when building with the gegl, could you provide some information about the beignet, like the llvm versions? And if the in the build progress, it will build some kernels and run?

Thanks
Xiuli

(In reply to Xiuli Pan from comment #3)
> Hi Jan,
> 
> I have face some problems when building with the gegl, could you provide
> some information about the beignet, like the llvm versions? And if the in
> the build progress, it will build some kernels and run?
> 
> Thanks
> Xiuli

Hi,

beignet is currently built against llvm-3.5, I can try rebuilding against llvm-3.9 (ToT) if it helps.

not sure I understood the gegl part.
gegl is an image manipulation library, some of its operations include accelerated paths using OpenCL. It includes a test suite and pixelize is one of the operations in the test suite (you can try "make check" to run the entire suite)

note that I also use babl git (babl is one of gegl's dependencies [0])

Jan

[0] https://git.gnome.org/browse/babl/

Hi Jan,

I now can run the test pixelize with make check or with run-compositions.py and the reproduce code you give me.

I have update to ubuntu 16.04 and the build problem seems sovled.
I tried LLVM 3.6 and LLVM 3.8, with beignet master branch(dff184f0f99d635622e2cb7b74279220852ae4f4)
I could not find git-309afa7 commit, could you provide the beignet you are using? And llvm 3.5 has some bug, you can try with some newer llvm now.

The log is here：
./run-compositions.py pixelize.xml --build-dir ../../build/
/home/pxl/lab/gegl/build/bin/gegl /home/pxl/lab/gegl/tests/compositions/pixelize.xml -o /home/pxl/lab/gegl/build/tests/compositions/output/pixelize.png

(lt-gegl:15046): GEGL-../../../gegl/graph/gegl-node.c-WARNING **: Failed to set operation type gegl:text, using a passthrough op instead

(lt-gegl:15046): GEGL-../../../gegl/graph/gegl-node.c-WARNING **: Failed to set operation type gegl:text, using a passthrough op instead
/home/pxl/lab/gegl/build/tools/gegl-imgcmp /home/pxl/lab/gegl/tests/compositions/reference/pixelize.png /home/pxl/lab/gegl/build/tests/compositions/output/pixelize.png

(lt-gegl-imgcmp:15064): GEGL-../../../gegl/graph/gegl-node.c-WARNING **: Failed to set operation type gegl:text, using a passthrough op instead

(lt-gegl-imgcmp:15064): GEGL-../../../gegl/graph/gegl-node.c-WARNING **: Failed to set operation type gegl:text, using a passthrough op instead
/home/pxl/lab/gegl/tests/compositions/reference/pixelize.png and /home/pxl/lab/gegl/build/tests/compositions/output/pixelize.png differ
  wrong pixels   : 13068/31680 (41.25%)
  max ?e         : 0.108
  avg ?e (wrong) : 0.039(wrong) 0.016(total)
because the error is smaller than 1.50 we'll say /home/pxl/lab/gegl/tests/compositions/reference/pixelize.png and /home/pxl/lab/gegl/build/tests/compositions/output/pixelize.png are identical
PASS pixelize.xml
/home/pxl/lab/gegl/build/bin/gegl /home/pxl/lab/gegl/tests/compositions/pixelize.xml -o /home/pxl/lab/gegl/build/tests/compositions/output/opencl-pixelize.png

(lt-gegl:15081): GEGL-../../../gegl/graph/gegl-node.c-WARNING **: Failed to set operation type gegl:text, using a passthrough op instead

(lt-gegl:15081): GEGL-../../../gegl/graph/gegl-node.c-WARNING **: Failed to set operation type gegl:text, using a passthrough op instead
Beignet: "unable to find good values for local_work_size[i], please provide local_work_size[] explicitly, you can find good values with trial-and-error method."
/home/pxl/lab/gegl/build/tools/gegl-imgcmp /home/pxl/lab/gegl/tests/compositions/reference/pixelize.png /home/pxl/lab/gegl/build/tests/compositions/output/opencl-pixelize.png

(lt-gegl-imgcmp:15101): GEGL-../../../gegl/graph/gegl-node.c-WARNING **: Failed to set operation type gegl:text, using a passthrough op instead

(lt-gegl-imgcmp:15101): GEGL-../../../gegl/graph/gegl-node.c-WARNING **: Failed to set operation type gegl:text, using a passthrough op instead
/home/pxl/lab/gegl/tests/compositions/reference/pixelize.png and /home/pxl/lab/gegl/build/tests/compositions/output/opencl-pixelize.png differ
  wrong pixels   : 13068/31680 (41.25%)
  max ?e         : 0.108
  avg ?e (wrong) : 0.039(wrong) 0.016(total)
because the error is smaller than 1.50 we'll say /home/pxl/lab/gegl/tests/compositions/reference/pixelize.png and /home/pxl/lab/gegl/build/tests/compositions/output/opencl-pixelize.png are identical
PASS pixelize.xml (OpenCL)
=== Test Results ===
 tests passed:  2
 tests skipped: 0
 tests failed:  0
======  PASS  ======

Hi,

thank you for looking into this. I can confirm that using:
  Platform Name                                   Intel Gen OCL Driver
Number of devices                                 1
  Device Name                                     Intel(R) HD Graphics Skylake Halo GT2
  Device Vendor                                   Intel
  Device Vendor ID                                0x8086
  Device Version                                  OpenCL 1.2 beignet 1.2 (git-77d78d5)

with llvm-3.7.1, I can no longer reproduce the issue. I'd assume that the llvm upgrade fixed it.

git-77d78d5 is one local patch on top of 
dff184f0f (my local patch allows NULL device param for cl_get_kernel_workgroup_info)

thank you,
Jan