Hi, I am getting the following run time errors for the code below. Any suggestions? _alev [ceng34:00724] *** Process received signal *** [ceng34:00724] Signal: Segmentation fault (11) [ceng34:00724] Signal code: Address not mapped (1) [ceng34:00724] Failing at address: 0xfffffffffffffff8 [ceng34:00724] [ 0] /lib64/libpthread.so.0 [0x315880de80] [ceng34:00724] [ 1] /usr/lib64/libstdc++.so.6(_ZN9__gnu_cxx18__exchange_and_addEPVii+0x2) [0x385dab7672] [ceng34:00724] [ 2] /usr/lib64/libstdc++.so.6(_ZNSs6assignERKSs+0x9b) [0x385da9ca4b] [ceng34:00724] [ 3] test-boost(_ZN5fieldaSERKS_+0x47) [0x42197f] [ceng34:00724] [ 4] test-boost(_ZNSt6__copyILb0ESt26random_access_iterator_tagE4copyIPK5fieldPS3_EET0_T_S8_S7_+0x3c) [0x4221be] [ceng34:00724] [ 5] test-boost(_ZSt10__copy_auxIPK5fieldPS0_ET0_T_S5_S4_+0x29) [0x422203] [ceng34:00724] [ 6] test-boost(_ZNSt13__copy_normalILb0ELb0EE6copy_nIPK5fieldPS2_EET0_T_S7_S6_+0x25) [0x42222b] [ceng34:00724] [ 7] test-boost(_ZSt4copyIPK5fieldPS0_ET0_T_S5_S4_+0x2d) [0x42225b] [ceng34:00724] [ 8] test-boost(_ZN5boost3mpi6detail12scatter_implI5fieldEEvRKNS0_12communicatorEPKT_PS7_iiN4mpl_5bool_ILb0EEE+0x90) [0x42a630] [ceng34:00724] [ 9] test-boost(_ZN5boost3mpi7scatterI5fieldEEvRKNS0_12communicatorEPKT_PS6_ii+0x50) [0x42b162] [ceng34:00724] [10] test-boost(_ZN5boost3mpi7scatterI5fieldEEvRKNS0_12communicatorERKSt6vectorIT_SaIS7_EEPS7_ii+0x55) [0x42b1db] [ceng34:00724] [11] test-boost(main+0x20e) [0x420880] [ceng34:00724] [12] /lib64/libc.so.6(__libc_start_main+0xf4) [0x3157c1d8b4] [ceng34:00724] [13] test-boost(__gxx_personality_v0+0x169) [0x420489] [ceng34:00724] *** End of error message *** mpirun noticed that job rank 0 with PID 724 on node ceng34-ib exited on signal 11 (Segmentation fault). #include <boost/mpi/environment.hpp> #include <boost/mpi/communicator.hpp> #include <boost/mpi/collectives.hpp> #include <boost/thread/barrier.hpp> #include <boost/thread/mutex.hpp> #include <boost/config.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/access.hpp> #include <boost/serialization/string.hpp> #include <boost/mpi/skeleton_and_content.hpp> #include <boost/mpi/datatype.hpp> #include <boost/mpi/allocator.hpp> #include <boost/archive/tmpdir.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/base_object.hpp> #include <boost/mpi.hpp> #include <boost/tokenizer.hpp> #include <boost/archive/tmpdir.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/serialization/export.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/hash_map.hpp> #include <boost/serialization/map.hpp> #include <string> #include <iostream> #include <vector> #include <fstream> #define MASTER 0 int arraySize = 7; using namespace std; namespace mpi = boost::mpi; struct field { string field_name; string field_type; string field_ref; string field_colType; }; namespace boost { namespace serialization{ template<class Archive> void serialize(Archive & ar, struct field & f, unsigned int version){ ar & f.field_name; ar & f.field_type; ar & f.field_ref; ar & f.field_colType; } } } int main(int argc, char* argv[]) { mpi::environment env(argc, argv); mpi::communicator world; int m_mySize, w_mySize, kk,i; struct field *relAllValues; struct field *relMyValues; vector<struct field> C; struct field c; w_mySize = arraySize / world.size(); cout << "w_mySize = " << w_mySize << endl; if (world.rank() == MASTER){ for(int i = 0; i < arraySize; i++){ c.field_name = "field_name=" ; c.field_type = "field_type="; c.field_ref = "field_ref="; c.field_colType = "field_colType="; C.push_back(c); } m_mySize = arraySize / world.size() + arraySize % world.size(); relMyValues = (struct field *) malloc(sizeof(struct field) * w_mySize); relAllValues = (struct field *) malloc(sizeof(struct field) * arraySize); } else{ relMyValues = (struct field *) malloc(sizeof(struct field) * w_mySize); } if (world.rank() == MASTER){ scatter(world, C, relMyValues, w_mySize, 0); } else{ scatter(world, C, relMyValues, w_mySize, 0); } if (world.rank() == 1){ cout << "MY RANK IS " << world.rank() << endl; } }