void SD_task_build_MxN_1D_block_matrix(SD_task_t task, int src_nb, int dst_nb){
xbt_assert(task->kind == SD_TASK_COMM_PAR_MXN_1D_BLOCK, "Task %s is not a SD_TASK_COMM_PAR_MXN_1D_BLOCK typed task."
"Cannot use this function.", task->name);
void SD_task_build_MxN_1D_block_matrix(SD_task_t task, int src_nb, int dst_nb){
xbt_assert(task->kind == SD_TASK_COMM_PAR_MXN_1D_BLOCK, "Task %s is not a SD_TASK_COMM_PAR_MXN_1D_BLOCK typed task."
"Cannot use this function.", task->name);