On Dec 14, 7:30 pm, "William Stein" <[email protected]> wrote:
> On Sun, Dec 14, 2008 at 12:20 PM, Spencer <[email protected]> wrote:
Hi,
> > I'm running Sage 3.2.1 on Ubuntu 8.10 (hardware: Macbook 3,1 Santa
> > Rosa with Intel Core 2 Duo). On installing Sage and starting it up for
> > the first time I get the message:
>
> > "WARNING! This Sage install was built on a machine that supports
> > instructions that are not available on this computer. Sage will
> > likely fail with ILLEGAL INSTRUCTION errors! The following processor
> > flags were on the build machine but are not on this computer:
>
> > mmxext 3dnowext 3dnow
This indicates that the Intel CPU you use doesn't support AMD specific
extensions :). I don't think we use any 3dnow[ext] or mmxext
instructions, so feel free to delete local/lib/sage-flags.txt to get
rid of this message. There is still a small chance that you might see
an "illegal instruction - aborting" situation, but I doubt it will
happen.
> > Emailhttp://groups.google.com/group/sage-supportfor help."
>
> > So I have followed the instructions there to come here for help. How
> > do I resolve this issue?
>
> You may want to try building Sage from source. To do so, follow
> the directions at
>
> http://sagemath.org/download-source.html
>
> Otherwise, are you using 32 or 64-bit Ubuntu? What is the output
> of cat /proc/cpuinfo on your computer? If you're using 32-bit Ubuntu,
> this is the binary you should use:
> http://sagemath.org/bin/linux/32bit/sage-3.2.1-ubuntu_32bit-xeon-i686...
Yeah, building from source will avoid this altogether and you will get
optimum performance for your specific CPU this way.
> William
Cheers,
Michael
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