Hi,

I have a similar error. The problem for me seems to be that
'fprintf(fpout, "%.e\n", t0);' of line 91 of
atlas-3.10.1.p6/src/ATLAS/tune/sysinfo/matime.c outputs "0e+00". Scanf
then only reads "0" instead of the full line "0e+00". Consequently the
next value cannot be read correctly. (Interestingly scanf does read all of
"1e+00" and "0.0e+00".)

Work-around might be to read line by line and use sscanf instead of scanf.


Regards,

Erik Massop


On Mon, October 28, 2013 10:37 pm, fechn...@gmail.com wrote:
> Hi,
>
> I'm trying to build Sage 5.12 on my new box which has an
> Intel Core i7-3770 (Ivy Bridge) and runs Arch Linux.  But the build
> of ATLAS always fails early with the same error.
>
> You can find the log file here:
> http://informatik.hu-berlin.de/~fechnedu/atlas-3.10.1.p5.log
>
> I think the relevant lines are:
>
>   xmasrch: [...]/src/ATLAS//tune/sysinfo/masrch.c:116: matime: Assertion
> `fscanf(fp, "%lf", &mflop[i])' failed.
>
> and
>
>   xsyssum: [...]/src/ATLAS//tune/sysinfo/GetSysSum.c:92: getfpinfo:
> Assertion `system(ln) == 0' failed.
>
> and
>
>   ERROR 621 DURING CACHESIZE SEARCH!!.  CHECK INSTALL_LOG/Stage1.log FOR
> DETAILS.
>
>
> I already tried the following without any luck:
> - building Sage 5.13.beta1, which also fails with the exact same error
> - building with different numbers of threads
> - setting SAGE_ATLAS_ARCH to an appropriate value for my CPU
> - booting with 'intel_pstate=disable' and enabling the performance
> governor
>   on all cores (to be sure that the CPU does not get throttled)
>
> I don't know what more I could try, so I would be really thankful if
> somebody
> could get something out of the log and push me in the right direction :)
> If you need any more information just ask for it and I will gladly provide
> it.
>
> Thanks,
> Dustin
>
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