On Thursday, August 4, 2016 at 11:37:57 AM UTC+2, Erik Bray wrote: > > On Thu, Aug 4, 2016 at 11:35 AM, Erik Bray <erik....@gmail.com > <javascript:>> wrote: > > On Thu, Aug 4, 2016 at 11:17 AM, leif <not.r...@online.de <javascript:>> > wrote: > >> Jean-Pierre Flori wrote: > >>> On Thursday, August 4, 2016 at 11:07:38 AM UTC+2, Erik Bray wrote: > >>> > >>> Tangentially related, but it might be nice if GMP/MPIR got the > same > >>> treatment that some other packages have been getting, a few at a > time, > >>> of using the system version if it's available and current enough. > >>> Really should be done for every package in fact, but that's > something > >>> I'm happy to take one at a time, especially for such core > packages.... > >>> > >>> Note that GMP uses a lot of assembly when properly built and is used > >>> basically by all other libraries. > >>> Using a prebuilt one without specific assembly is maybe not the best > idea. > >> > >> The assembly is not a problem, since most distros build GMP with > >> --enable-fat. But the rest gets compiled with arch and tune generic, > >> not exploiting any instruction set extensions most CPUs nowadays have. > >> > >> But we could at least /offer/ the option to build Sage with > >> --with-[g]mp=system etc. > > > > That's not even necessarily all true. Just because it's the "system" > > GMP doesn't mean it hasn't been tuned. By default, no, but most OS's > > have instructions for building tuned system installs of MP, BLAS, etc. > > In other words, I may already have my own well-tuned collection of > libraries on my system that I want to use Sage with, and that should > be my choice. This goes for almost all Sage's dependencies (so long > as minimal version requirements are met, etc.). > Sure you can build everything from source on your own rather than using system libs or let Sage build stuff :) That was not my point, it is good to have an option to use the system libraries, but don't expect everything to be well-tuned then. I don't think a lot of libs provide a fat option as GMP does. Nor that a lot of distros really tune the package they build for modern archs (unless they want to make their poor users unhappy). IIRC at some point Debian provided a bunch of different atlas binaries built for different microarchitecture but that must have been a hell to maintain and is not the case anymore.
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