dash::copy (local range to global destination) not copying the whole range #346
Description
dash::Array<int> arr(100);
if( dash::myid()==0 ) {
int buf[100];
std::iota(buf, buf+100, 0);
// copy local buffer to global array
dash::copy(buf, buf+100, arr.begin());
}
arr.barrier();
if( dash::myid()==0 ) {
for( auto el: arr ) {
cout << (int)el << " ";
}
cout << endl;
}
Looks like the copy is performed only for the fist two units and the other transfers go haywire somewhere - CMake builds give an additional segfault, a build with the manual Makefile, strangely, doesn't.
mpirun -n 4 ./main
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
mpirun -n 5 ./main
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
std::copy works as expected (good!) but of course then the transfer is done element-by-element.