On May 2, 2008, at 11:25 AM, mabshoff wrote: > On May 2, 8:06 pm, Jason Grout <[EMAIL PROTECTED]> wrote: >> William Stein wrote: > > Hi, > >> Steal the CPU detection code from ATLAS and use that to test to >> see if >> the processor we're running on is the same as the processor we >> compiled >> for? That seems like a bit much. > > You really don't want to do that - believe me, I have seen and > improved the ATLAS cpu detection code and it requires an assembler to > work. Other than that it is overblown and we can cook up something > better and simpler with a three line bash script ;) > >> How about compiling a generic binary (i.e., minimal >> optimizations)? Is >> that possible with ATLAS and the other programs? > > Yes, but then something else will break. Depending on the compiler you > use it just uses SSE2 instructions unless you specifically tell the > compiler not to use it. And attempting to dix that via CFLAGS and > CPPFLAGS is not a good idea. Somebody needs to find some pre-SSE2 > hardware and donate it to William so we can build a "last resort" > binary. Anything else will likely not work. > > tseug from IRC did build Sage 3.0 on some Duron laptop and it took 22 > hours, so building from source is generally not a good idea for people > with low end hardware, but since we cannot and will not likely provide > binaries for a wide range of distributions for non-SSE2 hardware due > to limited and usually slow hardware it is something we will have to > deal with for a while. Could we use a bunch on non-SSE2 Athlons with > decent, i.e. 1GB RAM, this would be doable.
I'm sure the UW Math department has machines that old which we could get for free when the swap out hardware. (One would probably want to add some RAM though, the box I used to have in my office only had 256 MB). - Robert --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
