On 15 June 2008 at 17:11, Brian Barrett wrote: | On Jun 15, 2008, at 2:20 PM, Dirk Eddelbuettel wrote: | | > Yup: I still suspect compiler / linker changes in Ubuntu between Gutsy | > (released Oct 2007) and Hardy (April 2008). | > | > Why? Because the exactly same source package for Open MPI (as | > maintained by | > Manuel and myself for Debian) works for me on Ubuntu Hardy __if I | > compile it | > on Ubuntu Gutsy__. | > | > Now, I reported this to Ubuntu ... for no answer. Lucas and | > Christoph at | > Debian today released a feature allowing us Debian maintainers to | > see which | > our packages have bugreports in Ubuntu. It was only through this | > mechanism | > that I learned that the segfault I saw with Rmpi (using Open MPI) | > had been | > experienced by someone else, and that a similar bug occurs with | > Python use on | > top of Open MPI. | > | > But still no tangible answer from Canonical / Ubuntu other that some | > reshuffling of bug reports titles and numbers. Very disappointing. | > | > I am CCing Steffen and Andreas who've seen similar bugs and are | > awaiting | > answers too. I am also CCing Cesare at Ubuntu who did the bug | > rearrangement, | > maybe he will find a moment to share their plans with us. | | I suppose I'm glad that it doesn't look like an Open MPI problem. Due
Yup. Just heard from the fellow at Ubuntu/Canonical: they broke things via LDFLAGS="-Wl,-Bsymbolic" which makes Open MPI fall on its face due to the three distinct libraries... Setting LDFLAGS="" as we do for Debian overcomes the problem. Cheers, Dirk | to continual problems with the ptmalloc2 code in Open MPI, we've | decided that for v1.3, we'll extract that code out into its own | library. Users who need the malloc hooks for InifiniBand support | (only a small number of applications really benefit from it) will have | to explicitly link in the extra library. Hopefully, this will resolve | some of these headaches. -- Three out of two people have difficulties with fractions.
