Hi,
I built sage from source and ran 'make test' on it. It failed on
sage -t "devel/sage/sage/plot/plot.py"
sage -t "devel/sage/sage/symbolic/function.pyx"
sage -t "devel/sage/sage/rings/polynomial/multi_polynomial.pyx"
sage -t "devel/sage/sage/functions/constants.py"
though the build documentation suggested that it was normal to fail on
a couple tests?
When I launch the version I compiled from source, it didn't give me
any warning about instruction sets. It appears to function exactly the
same as the binary I downloaded, once I removed the sage-flags.txt
file. So it seems that there is nothing wrong with the pre-built
version, though someone might want to look into why it claims to
require sse4_1 when it does not appear to need them (possibly it was
compiled on a machine with sse4 so it automatically assumes it is
needed?). Perhaps sse4 doesn't need to be listed in sage-flags.txt?
As for William Stein's comment, I watched memory usage as it tried to
compute pi(10^10), and it didn't rise noticeably before giving the seg
fault (it also only took a moment). Even if it is a memory issue,
doesn't sage have a more graceful and informative way to fail? I
wonder how pi(x) is computed in sage, it it is simply referencing a
pre-computed table of primes then perhaps the seg fault is an
indication that it went past the end of the table?
I looked at the entry in the tracker, what does prime_pi(k,40) do? I
thought that prime_pi was a function of a single variable, and when I
tried using it that way in sage it threw an error.
Thank you both for your help,
- Ryan
On Mar 18, 3:20 pm, Johan Oudinet <[email protected]> wrote:
> On Wed, Mar 18, 2009 at 4:20 PM, [email protected] <[email protected]> wrote:
>
> > Hi,
>
> > After using version 3 for over a year, it finally occured to me I
> > should upgrade. When trying to start version 3.4 I get:
>
> > ----------------------------------------------------------------------
> > | Sage Version 3.4, Release Date: 2009-03-11 |
> > | Type notebook() for the GUI, and license() for information. |
> > ----------------------------------------------------------------------
>
> > **********************************************************************
> > 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:
>
> > sse4_1
>
> > Emailhttp://groups.google.com/group/sage-supportfor help.
> > To remove this warning and make Sage start, just delete
> > /home/bixbyr/Desktop/sage-3.4-linux-Ubuntu_8.10-i686-Linux/local/
> > lib/sage-flags.txt
> > **********************************************************************
>
> > I tried removing this file to see if sage will run correctly, it
> > doesn't seem to. For a quick stress test I did
> > sage: prime_pi(10^10) ... and got back
> > /home/bixbyr/Desktop/sage-3.4-linux-Ubuntu_8.10-i686-Linux/local/bin/
> > sage-sage: line 197: 8689 Segmentation fault sage-ipython "$@" -
> > i
>
> > It returns correctly for prime_pi(10^9), so although it's possible
> > that the two errors are unrelated, that seems a strange way to fail if
> > the issue were related to insufficient memory.
>
> > I downloaded sage-3.4-linux-Ubuntu_8.10-i686-Linux.tar.gz from the
> > University of Washington mirror. I'm running ubuntu 8.10, kernel
> > version 2.6.27-11-generic. I have 4gb of ram, though running a 32 bit
> > kernel effectively limits me to ~3.2 gb. Since sse4 is a cpu
> > instruction set (from what I understand), here it the output for cat /
> > proc/cpuinfo:
>
> > processor : 0
> > vendor_id : GenuineIntel
> > cpu family : 6
> > model : 15
> > model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
> > stepping : 11
> > cpu MHz : 1600.000
> > cache size : 4096 KB
> > physical id : 0
> > siblings : 4
> > core id : 0
> > cpu cores : 4
> > apicid : 0
> > initial apicid : 0
> > fdiv_bug : no
> > hlt_bug : no
> > f00f_bug : no
> > coma_bug : no
> > fpu : yes
> > fpu_exception : yes
> > cpuid level : 10
> > wp : yes
> > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
> > cmov
> > pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm
> > constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2
> > ssse3 cx16 xtpr lahf_lm
> > bogomips : 4799.97
> > clflush size : 64
> > power management:
> > ( ... it then lists 3 more processors with the same information)
>
> > Although not the newest processor, it seems like this should be recent
> > enough to run sage. I also tried installing the new version on my
> > laptop, another ubuntu 8.10 system this time with a core 2 duo
> > processor, and got the exact same error.
>
> > Any thoughts? Thanks a lot,
>
> Have you tried to build Sage from sources? If you also get the same
> error, it will mean this is not an error related to your cpu
> instruction set.
>
> --
> Johan
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