[mvapich-discuss] Re: mvapich2 crash

[Matthew Koop]

This is somewhat strange. Does using the latest MVAPICH2 without explitly
setting --enable-threads=multiple work? There has been a bug fix to
ptmalloc with the latest release as well.

Your example works fine on my system here with the latest MVAPICH2:
[koop at wci1-oib mvapich2-trunk3]$ ./bin/mpirun_rsh -np 1 wci1 ./pt
In main: creating thread 0
In main: creating thread 1
In main: creating thread 2
In main: creating thread 3
In main: creating thread 4
Hello, World! It's me, thread #5!
Hello, World! It's me, thread #5!
Hello, World! It's me, thread #5!
Hello, World! It's me, thread #5!
Hello, World! It's me, thread #5!

Unless you are making MPI calls from the threads using MPI_THREAD_MULTIPLE
should not be required (and would require MPI_Init_thread).

Matt

On Thu, 13 Nov 2008, SpiglerG wrote:

> > Hi.
> > Since when I started using the BASS cluster, I've worked on porting my
> > applications to the new system (mainly libraries compatibility), but I
> > had some weird problems with using the installed MPI library.
> > After some coding, I could finally take the problem down to a simple case.
> > It seems that running an MPI program which uses pthread library, and
> > has threads instancing malloc/free calls leads to program crashes due
> > to `munmap_chunk() invalid pointer`s.
> > This could be depend on some memory locking or strict memory handling
> > from the MPI system; could someone help me solving it?
> > I'm attaching the source code I'm using (the stripped-down one), among
> > with an example of a crash.
> > I'm compiling with `mpicc -o pt pt.c -lpthread -fPIC` (-fPIC just to
> > get some more debug information), and running with `mpirun -np 1
> > -machinefile machines $(pwd)/pt` (where machines contains a single
> > line with an allocated machine, eg using `qlogin -l gpus=4`, [as I'm
> > working on GPU nodes for my apps]).
> >
> > Hope someone can help me.
> >              Giacomo Spigler
> >
>
> I've downloaded and compiled latest version of MVAPICH2, compiling
> with `./configure --prefix...  --enable-cxx --enable-threads=multiple`
> and now the problems doesn't persist anymore.
> It could be that it was related to a now-fixed MVAPICH2 bug, or to a
> missing `enable-threads` (as the problem was related to threads), but
> it's solved.
> I would like to ask whether it is possible to do this officially (that
> is, without having to keep my mpicc executable to compile my
> programs), and upgrade the system this way.
> Thanks.
>
>               Giacomo Spigler
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