David Cournapeau wrote: > Andrew Jaffe wrote: >> Hi All, >> >> I have just switched from RHEL to debian, and all of a sudden I started >> getting floating point exception errors in various contexts. >> >> Apparently, this has to do with some faulty error stuff in glibc, >> specifically related to the sse. I would prefer to fix the actual >> problem, but I can't seem to be able to get the recommended 'apt-get >> source glibc' incantation to work (I'm not root, but I can sudo.) >> > What does not work ? The apt-get source part ? The actual building ? > > Basically, if the sources are OK, you just need to do > - fakeroot dpkg-source -x name_of_dsc_file > - cd name_of_package > - fakeroot dpkg-buildpackage > > And that's it
Aha -- I didn't know about fakeroot... Thanks! That was the problem with apt-get source. I'm compiling the patched version now... wow, is it slow! >> I was able to fix some of these issues by simply downgrading ATLAS to >> not use sse instructions anymore. >> >> But f2py still links with sse and sse2 by default. I can't quite >> understand the configuration well enough to work out how to turn it off. >> Can someone give me any guidance? >> > The way it is supposed to work, at least on debian and ubuntu, is that > you never link to the sse/sse2 versions, but to the non-optimized > versions. After, the dynamic loader will get the right one (ie optimized > if available) instead of the one linked (this of course only works for > dynamic linking). You can check which library is picked with a ldconfig > - p | grep lapack (for lapack functions, and so on...) The problem with f2py isn't the atlas/lapack linkage, which it does correctly, but the fact that it automatically appends -sse2 to the g77 compile options; I couldn't figure out how to turn that off! Although now I'm not so sure, since I can never get my self-compiled executable version of my fortran code to give the same error as when it runs within python. But with the patched glibc, I think I'm alright in any event! Thanks! A ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion
