ruby: perfect switch: refactor code
Refactored the code in operateVnet(), moved partly to a new function operateMessageBuffer().
This commit is contained in:
Nilay Vaish
parent
a706b6259a
commit
5f1d1ce5d4
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@ -104,9 +104,6 @@ PerfectSwitch::~PerfectSwitch()
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void
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PerfectSwitch::operateVnet(int vnet)
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{
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MsgPtr msg_ptr;
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Message *net_msg_ptr = NULL;
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// This is for round-robin scheduling
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int incoming = m_round_robin_start;
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m_round_robin_start++;
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@ -123,10 +120,6 @@ PerfectSwitch::operateVnet(int vnet)
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incoming = 0;
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}
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// temporary vectors to store the routing results
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vector<LinkID> output_links;
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vector<NetDest> output_link_destinations;
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// Is there a message waiting?
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if (m_in[incoming].size() <= vnet) {
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continue;
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@ -137,139 +130,152 @@ PerfectSwitch::operateVnet(int vnet)
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continue;
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}
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while (buffer->isReady()) {
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DPRINTF(RubyNetwork, "incoming: %d\n", incoming);
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operateMessageBuffer(buffer, incoming, vnet);
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}
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}
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}
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// Peek at message
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msg_ptr = buffer->peekMsgPtr();
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net_msg_ptr = msg_ptr.get();
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DPRINTF(RubyNetwork, "Message: %s\n", (*net_msg_ptr));
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void
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PerfectSwitch::operateMessageBuffer(MessageBuffer *buffer, int incoming,
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int vnet)
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{
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MsgPtr msg_ptr;
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Message *net_msg_ptr = NULL;
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output_links.clear();
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output_link_destinations.clear();
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NetDest msg_dsts = net_msg_ptr->getDestination();
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// temporary vectors to store the routing results
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vector<LinkID> output_links;
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vector<NetDest> output_link_destinations;
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// Unfortunately, the token-protocol sends some
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// zero-destination messages, so this assert isn't valid
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// assert(msg_dsts.count() > 0);
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while (buffer->isReady()) {
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DPRINTF(RubyNetwork, "incoming: %d\n", incoming);
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assert(m_link_order.size() == m_routing_table.size());
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assert(m_link_order.size() == m_out.size());
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// Peek at message
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msg_ptr = buffer->peekMsgPtr();
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net_msg_ptr = msg_ptr.get();
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DPRINTF(RubyNetwork, "Message: %s\n", (*net_msg_ptr));
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if (m_network_ptr->getAdaptiveRouting()) {
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if (m_network_ptr->isVNetOrdered(vnet)) {
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// Don't adaptively route
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for (int out = 0; out < m_out.size(); out++) {
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m_link_order[out].m_link = out;
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m_link_order[out].m_value = 0;
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}
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} else {
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// Find how clogged each link is
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for (int out = 0; out < m_out.size(); out++) {
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int out_queue_length = 0;
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for (int v = 0; v < m_virtual_networks; v++) {
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out_queue_length += m_out[out][v]->getSize();
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}
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int value =
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(out_queue_length << 8) |
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random_mt.random(0, 0xff);
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m_link_order[out].m_link = out;
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m_link_order[out].m_value = value;
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}
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output_links.clear();
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output_link_destinations.clear();
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NetDest msg_dsts = net_msg_ptr->getDestination();
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// Look at the most empty link first
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sort(m_link_order.begin(), m_link_order.end());
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// Unfortunately, the token-protocol sends some
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// zero-destination messages, so this assert isn't valid
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// assert(msg_dsts.count() > 0);
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assert(m_link_order.size() == m_routing_table.size());
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assert(m_link_order.size() == m_out.size());
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if (m_network_ptr->getAdaptiveRouting()) {
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if (m_network_ptr->isVNetOrdered(vnet)) {
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// Don't adaptively route
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for (int out = 0; out < m_out.size(); out++) {
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m_link_order[out].m_link = out;
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m_link_order[out].m_value = 0;
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}
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} else {
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// Find how clogged each link is
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for (int out = 0; out < m_out.size(); out++) {
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int out_queue_length = 0;
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for (int v = 0; v < m_virtual_networks; v++) {
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out_queue_length += m_out[out][v]->getSize();
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}
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int value =
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(out_queue_length << 8) |
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random_mt.random(0, 0xff);
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m_link_order[out].m_link = out;
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m_link_order[out].m_value = value;
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}
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for (int i = 0; i < m_routing_table.size(); i++) {
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// pick the next link to look at
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int link = m_link_order[i].m_link;
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NetDest dst = m_routing_table[link];
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DPRINTF(RubyNetwork, "dst: %s\n", dst);
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if (!msg_dsts.intersectionIsNotEmpty(dst))
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continue;
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// Remember what link we're using
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output_links.push_back(link);
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// Need to remember which destinations need this message in
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// another vector. This Set is the intersection of the
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// routing_table entry and the current destination set. The
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// intersection must not be empty, since we are inside "if"
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output_link_destinations.push_back(msg_dsts.AND(dst));
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// Next, we update the msg_destination not to include
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// those nodes that were already handled by this link
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msg_dsts.removeNetDest(dst);
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}
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assert(msg_dsts.count() == 0);
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// Check for resources - for all outgoing queues
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bool enough = true;
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for (int i = 0; i < output_links.size(); i++) {
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int outgoing = output_links[i];
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if (!m_out[outgoing][vnet]->areNSlotsAvailable(1))
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enough = false;
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DPRINTF(RubyNetwork, "Checking if node is blocked ..."
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"outgoing: %d, vnet: %d, enough: %d\n",
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outgoing, vnet, enough);
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}
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// There were not enough resources
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if (!enough) {
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scheduleEvent(Cycles(1));
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DPRINTF(RubyNetwork, "Can't deliver message since a node "
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"is blocked\n");
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DPRINTF(RubyNetwork, "Message: %s\n", (*net_msg_ptr));
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break; // go to next incoming port
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}
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MsgPtr unmodified_msg_ptr;
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if (output_links.size() > 1) {
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// If we are sending this message down more than one link
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// (size>1), we need to make a copy of the message so each
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// branch can have a different internal destination we need
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// to create an unmodified MsgPtr because the MessageBuffer
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// enqueue func will modify the message
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// This magic line creates a private copy of the message
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unmodified_msg_ptr = msg_ptr->clone();
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}
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// Dequeue msg
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buffer->dequeue();
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m_pending_message_count[vnet]--;
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// Enqueue it - for all outgoing queues
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for (int i=0; i<output_links.size(); i++) {
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int outgoing = output_links[i];
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if (i > 0) {
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// create a private copy of the unmodified message
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msg_ptr = unmodified_msg_ptr->clone();
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}
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// Change the internal destination set of the message so it
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// knows which destinations this link is responsible for.
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net_msg_ptr = msg_ptr.get();
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net_msg_ptr->getDestination() =
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output_link_destinations[i];
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// Enqeue msg
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DPRINTF(RubyNetwork, "Enqueuing net msg from "
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"inport[%d][%d] to outport [%d][%d].\n",
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incoming, vnet, outgoing, vnet);
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m_out[outgoing][vnet]->enqueue(msg_ptr);
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}
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// Look at the most empty link first
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sort(m_link_order.begin(), m_link_order.end());
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}
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}
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for (int i = 0; i < m_routing_table.size(); i++) {
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// pick the next link to look at
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int link = m_link_order[i].m_link;
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NetDest dst = m_routing_table[link];
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DPRINTF(RubyNetwork, "dst: %s\n", dst);
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if (!msg_dsts.intersectionIsNotEmpty(dst))
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continue;
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// Remember what link we're using
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output_links.push_back(link);
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// Need to remember which destinations need this message in
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// another vector. This Set is the intersection of the
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// routing_table entry and the current destination set. The
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// intersection must not be empty, since we are inside "if"
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output_link_destinations.push_back(msg_dsts.AND(dst));
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// Next, we update the msg_destination not to include
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// those nodes that were already handled by this link
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msg_dsts.removeNetDest(dst);
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}
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assert(msg_dsts.count() == 0);
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// Check for resources - for all outgoing queues
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bool enough = true;
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for (int i = 0; i < output_links.size(); i++) {
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int outgoing = output_links[i];
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if (!m_out[outgoing][vnet]->areNSlotsAvailable(1))
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enough = false;
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DPRINTF(RubyNetwork, "Checking if node is blocked ..."
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"outgoing: %d, vnet: %d, enough: %d\n",
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outgoing, vnet, enough);
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}
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// There were not enough resources
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if (!enough) {
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scheduleEvent(Cycles(1));
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DPRINTF(RubyNetwork, "Can't deliver message since a node "
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"is blocked\n");
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DPRINTF(RubyNetwork, "Message: %s\n", (*net_msg_ptr));
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break; // go to next incoming port
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}
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MsgPtr unmodified_msg_ptr;
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if (output_links.size() > 1) {
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// If we are sending this message down more than one link
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// (size>1), we need to make a copy of the message so each
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// branch can have a different internal destination we need
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// to create an unmodified MsgPtr because the MessageBuffer
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// enqueue func will modify the message
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// This magic line creates a private copy of the message
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unmodified_msg_ptr = msg_ptr->clone();
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}
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// Dequeue msg
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buffer->dequeue();
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m_pending_message_count[vnet]--;
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// Enqueue it - for all outgoing queues
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for (int i=0; i<output_links.size(); i++) {
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int outgoing = output_links[i];
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if (i > 0) {
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// create a private copy of the unmodified message
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msg_ptr = unmodified_msg_ptr->clone();
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}
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// Change the internal destination set of the message so it
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// knows which destinations this link is responsible for.
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net_msg_ptr = msg_ptr.get();
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net_msg_ptr->getDestination() = output_link_destinations[i];
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// Enqeue msg
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DPRINTF(RubyNetwork, "Enqueuing net msg from "
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"inport[%d][%d] to outport [%d][%d].\n",
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incoming, vnet, outgoing, vnet);
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m_out[outgoing][vnet]->enqueue(msg_ptr);
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}
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}
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}
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@ -85,6 +85,7 @@ class PerfectSwitch : public Consumer
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PerfectSwitch& operator=(const PerfectSwitch& obj);
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void operateVnet(int vnet);
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void operateMessageBuffer(MessageBuffer *b, int incoming, int vnet);
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SwitchID m_switch_id;
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