On Sun, Jul 1, 2018 at 9:49 PM Jeff Hammond <jeff.scie...@gmail.com> wrote:
> On Sun, Jul 1, 2018 at 10:43 AM Victor Eijkhout <eijkh...@tacc.utexas.edu> > wrote: > >> >> >> On Jul 1, 2018, at 12:30 PM, Jeff Hammond <jeff.scie...@gmail.com> wrote: >> >> If you really want to do this, then replace COMMON with CORE to >> specialize for SKX. There’s not point to using COMMON if you’ve got the MIC >> path already. >> >> >> We advocate CORE on our userguides, but the Intel compiler crashes >> reliably with that in certain cases. I think in particular Intel has never >> figured out how complex numbers work. >> > > Is PETSc using C99 _Complex or C++ std::complex? > It can be configured to use either. Matt > I haven’t heard any complaints about how Intel compilers treat > ISO-standard complex types. I’ll see what’s in the ticket system now. > > If the compiler crashes it’s always on the petsc complex mode. I think I >> have submitted tickets about that, so maybe it’s fixed in update 3. >> > > Version 17 I assume? > > >> I have also seen cases where CORE gives numerical problems and replacing >> by COMMON fixed them. Sorry, that was a user ticket and having solved it I >> didn’t bother to submit an Intel support ticket. >> > > AVX-512DQ shouldn’t change numerical results so this is an indirect effect > and worthy of creating a compiler bug report if you can isolate the issue. > > >> The support website is a nightmare anyway, so I’m not overly motivated to >> submit support tickets in the first place. >> > > I know that website sucks, but I have filed 50+ bug reports that way in > the past 4+ years, because it is the single most effective way to get > positive results. > > If you send me single-file preprocessed (Linux preferred, but Mac works) > MCVEs, I’ll put them straight into the internal ticket system. > > Jeff > >> -- > Jeff Hammond > jeff.scie...@gmail.com > http://jeffhammond.github.io/ > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener https://www.cse.buffalo.edu/~knepley/ <http://www.caam.rice.edu/~mk51/>
