Le dimanche 21 juin 2020 à 17:28 +0300, Adrian Bunk a écrit : > On Sun, Jun 21, 2020 at 02:54:22PM +0200, Sébastien Villemot wrote: > > Le dimanche 21 juin 2020 à 14:40 +0300, Adrian Bunk a écrit : > > > Source: openblas > > > Version: 0.3.9+ds-2 > > > Severity: normal > > > Tags: patch > > > > > > A debdiff for building openblas on armel is attached. > > > > What’s the point of building openblas on armel? > > > > Openblas is a highly optimized BLAS library, which only makes sense on > > machines with hardware floating point. > > > > For armel, reference BLAS (as provided by src:lapack) is probably as > > efficient. > > I don't think "efficiency" is relevant when using either on armel hardware...
Sure. But the difference is that src:lapack is standard Fortran 77, and should thus be well supported on armel. On the contrary, src:openblas is full of hardware-specific hacks, assembly code and the like; and upstream does not support armel. So enabling it on armel could mislead users into believing that openblas is supported and/or useful on their platform, which it is not. Also, upstream will not help us if there is a regression, and the package is likely to take forever to build given the low performance of armel (building it is already very resource hungry on an recent amd64 machine). > What I am interested in is that reverse dependencies behave > (and break) the same on armel as they do on armhf. Note that since src:lapack and src:openblas provide the same ABI, the recommended practice for packagers is to never explicitly (build- )depend on openblas (or at most to put it second in an alternative, or as a Recommends). But in any case, I don’t understand why we should aim at identical behaviour of armel and armhf in the field of number crunching. Those two architectures are very different in that area, in a number of respects, and this is unavoidable given the hardware differences. So I personally see more inconvenients than advantages to implementing this. Maybe my co-maintainer Mo Zhou could weigh in? -- ⢀⣴⠾⠻⢶⣦⠀ Sébastien Villemot ⣾⠁⢠⠒⠀⣿⡁ Debian Developer ⢿⡄⠘⠷⠚⠋⠀ https://sebastien.villemot.name ⠈⠳⣄⠀⠀⠀⠀ https://www.debian.org
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