simgrid::kernel::activity::Comm *comm = dynamic_cast<simgrid::kernel::activity::Comm *>(synchro);
if (comm != nullptr) {
comm->surf_comm->setCategory(category);
simgrid::kernel::activity::Comm *comm = dynamic_cast<simgrid::kernel::activity::Comm *>(synchro);
if (comm != nullptr) {
comm->surf_comm->setCategory(category);