seg = read_json_file("recv_ckmeans.json", gen);
smpi_register_op_cost_callback(SmpiOperation::RECV, std::bind(&smpi_cost_cb, seg, std::placeholders::_1,
std::placeholders::_2, std::placeholders::_3));
seg = read_json_file("recv_ckmeans.json", gen);
smpi_register_op_cost_callback(SmpiOperation::RECV, std::bind(&smpi_cost_cb, seg, std::placeholders::_1,
std::placeholders::_2, std::placeholders::_3));