Hi Karli, Karl Rupp <r...@iue.tuwien.ac.at> writes: > >> thanks for the reports. I'll run the respective functions through a >>> valgrind-like environment today, but I don't expect something to show up >>> at this point. The direct solve kernels for dense matrices are unchanged >>> for quite some time and haven't shown anything suspicious in the nightly >>> tests for *months* now. Thus, I'm very tempted to assume that this is a >>> problem with beignet - yet I'll double-check. >> >> Yes, I think so, too, now. But it is weird that I received a segfault on >> nVidia initially, too. I haven't studied the kernel caching mechanism: >> at the moment, the PyViennaCL cache directory is versioned, but should >> it also be separate for different devices? (And I will need to remember >> to clear out the cache directory for different viennacl git revisions, >> or add a mechanism to include the git reference..) > > The caching mechanism computes a hash of the source code and uses that > hash to access the binary object. I doubt that there is binary > compatibility across different OpenCL SDKs.
Yes, having now updated my beignet installation to the latest point release and tested various combinations of stale and clean caches, it seems like the tests pass successfully and without segfaults when there is no overlap of the cached objects across devices. > Philippe, does the caching mechanism take that into account and store > separate binaries for each OpenCL SDK? Or is the SDK name part of the hash? It seems not to do so. I can change this in PyViennaCL, but I don't know if it might be good to do as you suggest and have the SDK name part of the hash in the core. I can always change it in PyViennaCL for this release, and this could be postponed for the core till later. Cheers, Toby -- Toby St Clere Smithe http://tsmithe.net ------------------------------------------------------------------------------ _______________________________________________ ViennaCL-devel mailing list ViennaCL-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/viennacl-devel
