Re: [Starpu-devel] SOCL and ICD

[Sylvain HENRY <sylvain.henry@inria.fr>]

Hi,

Note that SOCL should work with any ICD loader (at least it works with 
NVidia's one). The ICD specification says that ICD clients have to be 
referenced in /etc/OpenCL/vendors. Consequently, SOCL and StarPU have to 
be installed by an admin to be used through the ICD.

The problem is that we would like users to test SOCL without having to 
make a system-wide installation. The ICD loader developed in Grenoble 
support an environment variable OCL_ICD_VENDORS that can be set to 
override the /etc/OpenCL/vendors path. It can be used to test a SOCL 
without being root.

A custom test session would look like:
> export OCL_ICD_VENDORS=/path/to/my/own/icds/
> export LD_PRELOAD=/path/to/ocl-icd/libOpenCL.so
> ./soclProgramToTest

There must be a file /path/to/my/own/icds/socl.icd containing 
/path/to/socl/libsocl-1.0.so. StarPU library you want to use must be in 
the LD_LIBRARY_PATH.

We don't want to disable SOCL if the ICD Loader installed is not the 
OCL's one. libsocl would work fine with it once installed.

++
Sylvain


Le 02/10/2012 14:24, Nathalie Furmento a écrit :
> All,
>
> SOCL uses now ICD to enable multiple OpenCL implementations. For
> reasons I cannot explain (ask Sylvain if you want more details), it
> only works with the ICD implementation developed in Grenoble
> (https://forge.imag.fr/projects/ocl-icd/).
>
> The problem is how we make sure that implementation is installed on
> the machine when running SOCL. Is there a way to detect the ICD
> implementation installed on the machine is that specific one? (and
> depending on the result, enable or disable SOCL).
>
> A solution would be to compile OCL when we compile StarPU. OCL's
> sources are available from a GIT repository (i do not know it that can
> be easily integrated with StarPU's subversion server --- is there a
> similar solution to svn:externals for git?). The license is BSD-2.
>
> Any comments are welcomed.
>
> Cheers,
>
> Nathalie
>
> --
> ----------------------------------------------------------------------------
> Dr Nathalie Furmento                         CNRS R&D Engineer
> Centre de Recherche INRIA Bordeaux Sud-Ouest http://www.labri.fr/~furmento/
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--
Sylvain Henry
CS PhD Student at INRIA/LaBRI
University of Bordeaux (France)
sylvain.henry@inria.fr