Linux/AM5728: OpenCV DSP build error

Hi,

It will succeed in ARM .My SDK is 4.2.

I am confused here. Are you saying that it compiles successfully using SDK 4.2 or successfully when it is compiled natively on the ARM platform but failed when cross-compile?

Rex

I don't see the OpenCL compilation error. 

root@am57xx-evm:~/opencv_dsp_build_error# cat run.sh
export TI_OCL_LOAD_KERNELS_ONCHIP=Y
export TI_OCL_CACHE_KERNELS=Y
export OPENCV_OPENCL_DEVICE='TI AM57:ACCELERATOR:TI Multicore C66 DSP'
echo "OpenCL on, canny"
./test
export OPENCV_OPENCL_DEVICE='disabled'
echo "OpenCL off, canny"
./test

root@am57xx-evm:~/opencv_dsp_build_error# ./run.sh
OpenCL on, canny
OpenCL off, canny
root@am57xx-evm:~/opencv_dsp_build_error#

Did you run the script on Linux host? 

Rex

Although the details of our environment and code are different, we have this same error:

>>> Optimizer terminated abnormally
>>>> in function ifft_multi_radix_rows()

The error is produced during openCL compilation for DSP, which happens when the executable is run on ARM.

What is the secret sauce necessary to get cv::dft(umat, umat) to compile/run on DSP?

Hi,

we are also affected by this problem. And I think OpenCL and OpenCV behave differently with the pre-built (on the included SD card) and self-built SDK. With the prebuilt SDK we were not able to reproduce the problem because we were not able to activate OpenCL in OpenCV. With the selfbuilt SDK OpenCL is working and most of the functions in OpenCV are using the DSP, but cv::dft() will crash the OpenCL compiler.

We used this C++ code to utilize OpenCV with OpenCL:

#include <iostream>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/core/ocl.hpp>

int main(int argc, char* const argv[]) {
    if (cv::ocl::useOpenCL()) {
        std::cout << "OpenCL is activated" << std::endl;
    } else {
        std::cout << "OpenCL is not used!" << std::endl;
    }
    cv::UMat _mat (64, 64, CV_32F);
    cv::dft(_mat, _mat, 0, _mat.rows);
}

Compile with: g++ -lopencv_core -lopencv_imgproc -o test_dft [file.cpp]

And this script to run setup the OpenCL environment:

#!/bin/bash

export OPENCV_OPENCL_DEVICE='disabled'
echo "OpenCL off"
./test_dft

export TI_OCL_LOAD_KERNELS_ONCHIP=Y
export TI_OCL_CACHE_KERNELS=Y
export OPENCV_OPENCL_DEVICE='TI AM57:ACCELERATOR:TI Multicore C66 DSP'
echo "OpenCL on"
./test_dft

With the prebuilt SDK we get the following output:

OpenCL off
OpenCL is not used!
OpenCL on
OpenCL is not used!


With the selfbuilt SDK we get the following output:

OpenCL off
OpenCL is not used!
OpenCL on
OpenCL is activated

>>> Optimizer terminated abnormally
>>>>    in function ifft_multi_radix_rows()

>> Compilation failure
OpenCL program build log: -D LOCAL_SIZE=64 -D kercn=8 -D FT=float -D CT=float2 -D RADIX_PROCESS='fft_radix8(smem,twiddles+0,ind,1,8);fft_radix8(smem,twiddles+7,ind,8,8);' -D REAL_INPUT -D COMPLEX_OUTPUT -D NO_CONJUGATE

>> Compilation failure

Hi,

I checked again with the latest prebuilt filesystem/rootfs. The one that was on the included SD card seems to be very old and does not contain the OpenCL libraries. But even with the latest rootfs the problem persists.

Yours seems to work with released filesystem, but fail with the filesytem you built.

That's not quite true. There is, in fact, no error when I'm running on the (old) rootfs. But as you can see, OpenCL is not utilized when the environmental variables are set. When OpenCL is used - that's what we want - the compilation failure occurs. Both with the selfbuilt and the prebuilt filesystem.

You can test this with the example code and the script I provided in my last post.

"OpenCL off" should result in "OpenCL is not used!".
"OpenCL on" should result in "OpenCL is activated" and there should be no error stating "Optimizer terminated abnormally".