George -- what say you? On Apr 19, 2011, at 4:54 PM, Rolf vandeVaart wrote:
> Forgot the link… > > https://bitbucket.org/rolfv/ompi-trunk-cuda-rfc2 > > > > From: devel-boun...@open-mpi.org [mailto:devel-boun...@open-mpi.org] On > Behalf Of Rolf vandeVaart > Sent: Tuesday, April 19, 2011 4:45 PM > To: Open MPI Developers > Subject: [OMPI devel] RFC: Second Try: Add support to send/receive CUDA > device memory directly > > WHAT: Second try to add support to send data directly from CUDA device memory > via MPI calls. > > TIMEOUT: 4/26/2011 > > DETAILS: Based on all the feedback (thanks to everyone who looked at it), I > have whittled down what I hope to accomplish with this RFC. There were > suggestions to better modularize the CUDA registration code so I will take a > look at that separately. Since the registration code is a performance > feature, it will be dropped from this RFC and investigated separately. This > significantly reduced the changes being proposed here. With this RFC, all > the changes are isolated in datatype and convertor code. As mentioned > before, the changes mostly boil down to replacing memcpy with cuMemcpy when > moving the data to or from a CUDA device buffer. > > Per suggestions, the choice to disable the large memory RDMA now happens on a > per message basis. This is done by adding a flag to the convertor which > tells the BTLs that an intermediate buffer is needed when dealing with device > memory. > > As before, this code would be enabled via a configure option. A mostly > completed version is viewable on bitbucket although I know the configure code > is sorely lacking. > > This is the new list of changed files. > > M opal/config/opal_configure_options.m4 > A opal/datatype/opal_datatype_cuda.c > A opal/datatype/opal_datatype_cuda.h > M opal/datatype/opal_convertor.h > M opal/datatype/opal_datatype_copy.c > M opal/datatype/opal_datatype_unpack.c > M opal/datatype/Makefile.am > M opal/datatype/opal_datatype_pack.h > M opal/datatype/opal_convertor.c > M opal/datatype/opal_datatype_unpack.h > M ompi/mca/pml/ob1/pml_ob1_sendreq.h > > Thanks, > Rolf > This email message is for the sole use of the intended recipient(s) and may > contain confidential information. Any unauthorized review, use, disclosure > or distribution is prohibited. If you are not the intended recipient, please > contact the sender by reply email and destroy all copies of the original > message. > > _______________________________________________ > devel mailing list > de...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/devel -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
