-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 02.08.2010 16:08, Kristian Ølgaard wrote: > On 2 August 2010 15:45, Florian Rathgeber > <[email protected]> wrote: > Hi, > > I modified FFC to accept an additional option for the -l parameter to > output tensor tabulation code suitable for execution in a CUDA kernel on > the GPU. For that the indexing for coordinates, coefficients and the > element tensor needs to be changed since the data structures look > differently on the GPU (foremost they are flattened). The Jacobi > computations look differently as well due to the way coordinates are stored. > > What I did was to provide a function override_gpu() in cpp.py that > updates the cpp.format dictionary to generate the correct index into the > data structures. This function is called at the beginning of > codegeneration.py:generate_code if the GPU target was specified by the > -l parameter. > > This works for tensor representation, but not functions values > (including coefficients) for quadrature, since the corresponding code is > generated by the class "QuadratureTransformerBase". I'm no Python > expert, but I assume the override of cpp.format on the global scope is > not visible inside the class scope. > >> It will be if you call override_gpu() in the representation stage >> instead of the code generation stage.
It does, thank you! > Since "QuadratureTransformerBase" does not get the parameters, it cannot > know if the target is GPU and override_gpu() should be called. > > My changes are more of a quick hack and certainly not a well-designed > way to solve this. I would be happy about suggestions both to quickly > fix the quadrature and also how to adapt the whole design to make it > more "clean" and straightforward. > >> We handle the formatting of floats in a similar way so I don't think >> the solution is too bad for now. OK, I guess I'll leave it like that for the moment. > (The corresponding wrapper code, which is different from the ordinary > DOLFIN wrapper code, is also generated depending on the -l option, but > that is a different topic, so I just mention it for the sake of > completeness) > >> and the option is '-l dolfin-gpu' if anyone wonders. Right, I should have mentioned that. Florian >> Kristian > > I published my branch here: > https://code.launchpad.net/~florian-rathgeber/ffc/gpu-wrappers > > Florian >> >> _______________________________________________ Mailing list: https://launchpad.net/~ffc Post to : [email protected] Unsubscribe : https://launchpad.net/~ffc More help : https://help.launchpad.net/ListHelp >> >> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (MingW32) iEYEARECAAYFAkxXKaQACgkQ8Z6llsctAxZD0wCg04bTYowqcMIEivVueHas30eU 1z0AoKJ3LAVK2319JztaUbiC2n6vemwh =XZE6 -----END PGP SIGNATURE-----
smime.p7s
Description: S/MIME Cryptographic Signature
_______________________________________________ Mailing list: https://launchpad.net/~ffc Post to : [email protected] Unsubscribe : https://launchpad.net/~ffc More help : https://help.launchpad.net/ListHelp
