new simgrid::instr::StartLinkEvent(SIMIX_get_clock(), father, link_type, src, "topology", key);
new simgrid::instr::EndLinkEvent(SIMIX_get_clock(), father, link_type, dst, "topology", key);
new simgrid::instr::StartLinkEvent(SIMIX_get_clock(), father, link_type, src, "topology", key);
new simgrid::instr::EndLinkEvent(SIMIX_get_clock(), father, link_type, dst, "topology", key);