msg_task_t task = MSG_parallel_task_create("file transfer for write", 2, m_host_list, computation_amount, communication_amount, NULL);
msg_error_t transfer = MSG_parallel_task_execute(task);
msg_task_t task = MSG_parallel_task_create("file transfer for write", 2, m_host_list, computation_amount, communication_amount, NULL);
msg_error_t transfer = MSG_parallel_task_execute(task);