void SIMIX_comm_start(smx_action_t action);
void SIMIX_comm_send(smx_process_t src_proc, smx_rdv_t rdv,
double task_size, double rate,
void SIMIX_comm_start(smx_action_t action);
void SIMIX_comm_send(smx_process_t src_proc, smx_rdv_t rdv,
double task_size, double rate,