Moving from openmpacc to OpenCL+OpenMP with cross-compilation support

Barath Ramesh

Hello,

I am using mcsdk-hpc_3_00_01_04 and I would like to move from the openmpacc model to OpenCL+OpenMP model. I went through the examples and all of them seem to be building the DSP binary in run-time using program.build. But I have not set-up native compilation due to lack of NAND space on the EVM.

I looked at the make file for OpenCL+OpenMP examples and they seem to be supporting cross-compilation on an x86 platform and was able to compile an executable using the same. But since I have not setup native compilation on the EVM, the executable breaks with shell errors:c6xl not found. Also, I am not sure of the OpenCL APIs that will allow me pass the pre-built DSP binaries at run-time.

I was wondering what would be a good starting point to move from openmpacc to OpenCL+OpenMP with cross-compilation support without too much trouble.

Sorry about the lengthy post and thank you in advance.

Best regards,

Barath Ramesh

over 10 years ago

0 Dunni Aribuki over 10 years ago

TI__Prodigy 450 points

Hi Barath,

My understanding is that you would like to pre-compile the OpenCL kernel wrapper (that invokes functions with OpenMP regions) on your x86. In order to do that, you would use the x86 version of clocl in $TARGET_ROOTDIR/usr/share/ti/opencl/bin/x86. You will also need the x86 version of the C6000 codegen tools.

You can look at the OpenCL “offline” example to see how to set up your makefile. Trying to cross compile this example would be a good place to start. You will need to set up some environment variables before you compile. Please see http://processors.wiki.ti.com/index.php/OpenCL_Getting_Started#Required_Environment_Variables and http://processors.wiki.ti.com/index.php/OpenCL_Examples for more information on these variables and instructions for cross compiling OpenCL code.

Thanks,

Dunni

0 Ajay Jayaraj over 10 years ago in reply to Dunni Aribuki

TI__Expert 3350 points

Barath,

FYI: An alternative to using NAND for the file system is to use a USB flash drive for both the kernel and the root file system. This approach is documented here: http://processors.wiki.ti.com/index.php/EVMK2H_Booting_from_USB_Flash_Drive

Ajay

0 Barath Ramesh over 10 years ago in reply to Dunni Aribuki

Intellectual 360 points

Thanks a lot Dunni, the offline example along with the sgemm example in OpenCL helped me to migrate to OpenCL from OpenACC easily.

regards,
Barath Ramesh

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Moving from openmpacc to OpenCL+OpenMP with cross-compilation support