/**
* @brief Start checks for finished operations in send/recv queues,
* and post new sends/recvs if possible.
* @param[in] me pointer to PE
*/
static void
service_queues(tw_pe *me)
{
int changed;
do {
changed = test_q(&posted_recvs, me, recv_finish);
changed |= test_q(&posted_sends, me, send_finish);
changed |= recv_begin(me);
changed |= send_begin(me);
} while (changed);
}
void
tw_net_start(void)
{
if (MPI_Comm_size(MPI_COMM_ROSS, &world_size) != MPI_SUCCESS)
tw_error(TW_LOC, "Cannot get MPI_Comm_size(MPI_COMM_ROSS)");
if( g_tw_mynode == 0)
{
printf("tw_net_start: Found world size to be %d \n", world_size );
}
// Check after tw_nnodes is defined
if(tw_nnodes() == 1 && g_tw_npe == 1) {
// force the setting of SEQUENTIAL protocol
if (g_tw_synchronization_protocol == NO_SYNCH) {
g_tw_synchronization_protocol = SEQUENTIAL;
} else if(g_tw_synchronization_protocol == CONSERVATIVE || g_tw_synchronization_protocol == OPTIMISTIC) {
g_tw_synchronization_protocol = SEQUENTIAL;
fprintf(stderr, "Warning: Defaulting to Sequential Simulation, not enought PEs defined.\n");
}
}
tw_pe_create(1);
tw_pe_init(0, g_tw_mynode);
//If we're in (some variation of) optimistic mode, we need this hash
if (g_tw_synchronization_protocol == OPTIMISTIC ||
g_tw_synchronization_protocol == OPTIMISTIC_DEBUG ||
g_tw_synchronization_protocol == OPTIMISTIC_REALTIME) {
g_tw_pe[0]->hash_t = tw_hash_create();
} else {
g_tw_pe[0]->hash_t = NULL;
}
if (send_buffer < 1)
tw_error(TW_LOC, "network send buffer must be >= 1");
if (read_buffer < 1)
tw_error(TW_LOC, "network read buffer must be >= 1");
init_q(&posted_sends, "MPI send queue");
init_q(&posted_recvs, "MPI recv queue");
g_tw_net_device_size = read_buffer;
// pre-post all the Irecv operations
recv_begin( g_tw_pe[0] );
}