Am Freitag, 15. Januar 2016, 15:39:37 schrieb Chris Siebenmann: > > I feel the same since the update, but I could't be sure so I thought it > > might just be my imagination. > > > > Hardware: > > AMD FX-8320 Eight-Core Processor 3,5 Ghz > > Radeon HD 7970 Ghz Edition > > 16 GB Ram > > File, cache etc. on SSD > > > > I'm also using Arch. Until the release the aur git version, then the > > precompiled package. > > One thing that abruptly strikes me is the choice of compiler used to > build DT. Assuming that appropriate libraries are available, a DT built
Yes. I already put a note when doing debug builds into the --version output because of that. > with gcc will use OpenCL but I believe that a DT built with clang will > not. OpenCL is used by DT for some on-CPU computations, with a fallback > to slower code if OpenCL is not available. In my own tests on Fedora 23, > this caused a clearly visible slowdown in a clang-compiled DT than on a > gcc-compiled one. You seem to be confusing OpenCL with OpenMP here. The first is the GPU library and not influenced by compiler used while the latter was already tested by the ldd call. > This may be irrelevant if DT is using your GPU for computations. I > don't have a suitable GPU (or a suitable driver for it), so my DT is > all on-CPU. > > It's possible that Arch has switched their default compilers from > gcc to clang and so DT was (re)built with clang in this release. > > Obvious disclaimer: I may be totally off track here. A bit, but the compiler (pr compiler flags, like used optimisations) could still be a reason. That's why compiling both versions next to each other would be helpful. > - cks Tobias
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