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Subject: Re: [OMPI users] Crash in _int_malloc via MPI_Init
From: Dirk Eddelbuettel (edd_at_[hidden])
Date: 2008-06-15 23:23:48


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.