I'm not sure how virtual boxes work. Do they emulate the CPU as well as the OS?
Unfortunately, there isn't really a lot we can do if virtual box is going out of its way to report incorrect cpu parameters through the *assembly instruction* cpuid, if that is what is happening (I am not sure if it is or not). Unfortunately, the solution does appear to be to build MPIR with -march=native, which apparently works. If anyone has any deep insight into this, please let us know. Maybe it is possible for us to do something about it upstream. I'm keen to fix it, I just don't understand the problem well enough. Bill. On 18 May 2012 16:16, William Stein <wst...@gmail.com> wrote: > On Fri, May 18, 2012 at 6:19 AM, Keshav Kini <keshav.k...@gmail.com> wrote: >> Jeroen Demeyer <jdeme...@cage.ugent.be> writes: >>> Something else to try: build with SAGE_FAT_BINARY=yes. Perhaps the >>> run-time CPU detection works better. >> >> Yup, that works. But it's still a workaround and not really a solution. >> It would be nice if I could type "make" and have everything just work. > > Building with SAGE_FAT_BINARY will result in other parts of Sage > (e.g., ATLAS) being built much less efficiently. It's far better to > use > > CFLAGS="-O2 -march=native" ./sage -i mpir > > which does seem to work. > > Many thanks for working on somehow fixing this. I think a lot of > people use virtualbox, so having MPIR building broken there is not > good... What do the MPIR dev's think is an acceptable solution here? > > -- William > >> >> -Keshav >> >> ---- >> Join us in #sagemath on irc.freenode.net ! >> >> -- >> To post to this group, send an email to sage-de...@googlegroups.com >> To unsubscribe from this group, send an email to >> sage-devel+unsubscr...@googlegroups.com >> For more options, visit this group at >> http://groups.google.com/group/sage-devel >> URL: http://www.sagemath.org > > > > -- > William Stein > Professor of Mathematics > University of Washington > http://wstein.org > > -- > You received this message because you are subscribed to the Google Groups > "mpir-devel" group. > To post to this group, send email to mpir-devel@googlegroups.com. > To unsubscribe from this group, send email to > mpir-devel+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/mpir-devel?hl=en. > -- You received this message because you are subscribed to the Google Groups "mpir-devel" group. To post to this group, send email to mpir-devel@googlegroups.com. To unsubscribe from this group, send email to mpir-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/mpir-devel?hl=en.
