Hi,
> Im a masters student from Indian Institute of Technology delhi. Im
working on PETSc.. for performance, which is my area of interest. Can
you please help me in knowing 'How to run PETSc on MIC' . That would
be of great help to me.
my experience is that 'performance' and 'MIC' for bandwidth-limited
operations don't go together. Regardless, you can use ViennaCL by
building via
--download-viennacl
for using the MIC via OpenCL, but you are usually much better off with a
proper multi-socket CPU node.
Feel free to have a look at my recent slides from the Intl. OpenCL
Workshop here:
http://iwocl.org/wp-content/uploads/iwocl-2014-tech-presentation-Karl-Rupp.pdf
PDF page 32 shows that in the OpenCL case one achieves only up to 20% of
peak bandwidth for 1900 different kernel configurations even for simple
kernels such as vector copy, vector addition, dot products, or dense
matrix-vector products. With some tricks one can probably get 30%, but
that's it.
PETSc does not provide any 'native' OpenMP execution on MIC for similar
reasons.
Best regards,
Karli
