Hello, I have a similar problem here. I try to send data from one process to another (mpirun -np 2). The dataI use is serialized in the appropriate way. If I send it to a text archive I can it restore again from this text archive and all is ok. But when I try to send the data between the processes something goes wrong and the data is not restored correctly. I have the following serialization routine: template<typename Float> template<class Archive> void Ball<Float>::serialize( Archive &ar, const unsigned int version ) { ar & BOOST_SERIALIZATION_NVP( members ) // std::vector<int> members // and so on... // Testing: for( int i=0; i<members.size(); ++i ) std::cout << members[i] << " "; std::cout << std::endl; } the output on sending such an object is (for example) 0 1 3 2 the output on receiving the same object is 0 0 0 0 So there seems to be something wrong during storing the data in ar or during the restoration process. Did someone in this thread come already to a solution to this problem? Cheers, Martin Am 03.09.2010 11:31, schrieb Francesco Biscani:
Hi Matthias,
I updated to Boost 1.44.0 but unfortunately the crash is now even in local mode (mpirun -np 2). The strange thing is that the serialization code is apparently working fine when used with text archives, but with MPI archives the slave process, upon reception, is deserializing the objects with seemingly random values (e.g., huge values instead of 1 or 0 for an integer data member of a structure).
I'm trying to isolate the problem right now and, in case I can reproduce it with a minimal example, I will post it here (though it is likely some mistake on my part, it's the first time I use MPI and serialization libraries).
Cheers,
Francesco
On Thu, Sep 2, 2010 at 4:26 AM, Matthias Troyer<troyer@phys.ethz.ch> wrote:
On Sep 2, 2010, at 7:39, Francesco Biscani<bluescarni@gmail.com> wrote:
Hello,
I'm getting a segfault when using Boost.MPI on a cluster of heterogeneous machines (x86_64 and ppc64). The problem arises when the "slave" machine, ppc64, receives its payload from the "master" machine, x86_64, and tries to unpack the archive. Tracing down the issue with valgrind and in debug mode, the problem arises here:
Can this be related to some endianness issue? Is Boost.MPI expected to work on heterogeneous clusters?
Hi Francesco,
Have you checked whether a program using the MPI C API can correctly send data on your heterogeneous cluster? Boost.MPI uses the support for heterogeneous machines of the underlying MPI library unless you define the macro BOOST_MPI_HOMOGENOUS.
Have you also tried the latest Boost release?
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