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Switch.cc
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#include "Switch.h"
#define FMT_HEADER_ONLY
#include "fmt/format.h"
Define_Module(Switch);
void Switch::initialize() {
for (int i = 0; i < gateSize("up_ports"); ++i) {
auto g = gate("up_ports$o", i);
auto gid = g->getId();
// use cPacket because gid is often larger than cMessage kind (short) can accommodate
endTransmissionEvents[gid] = new cPacket("endTxEvent", 0, gid);
channels[gid] = g->findTransmissionChannel();
upper_level_switch = (Switch*) g->getPathEndGate()->getOwnerModule();
}
for (int i = 0; i < gateSize("down_ports"); ++i) {
auto g = gate("down_ports$o", i);
auto gid = g->getId();
auto remote_id = g->getPathEndGate()->getOwnerModule()->getId();
gate_id[remote_id] = gid;
endTransmissionEvents[gid] = new cPacket("endTxEvent", 0, gid);
channels[gid] = g->findTransmissionChannel();
}
switchQueueLength = registerSignal("switchQueueLength");
switchTotalQueueLength = registerSignal("switchTotalQueueLength");
}
void Switch::clean_resources_for_tensor(const TensorKey &tensor_key) {
count_for_tensor_key.erase(tensor_key);
seen_for_tensor_key.erase(tensor_key);
}
void Switch::clean_resources_for_job(uint64_t jid) {
num_updates_for_job.erase(jid);
top_level_for_job.erase(jid);
gate_ids_for_job.erase(jid);
done_jobs.insert(jid);
}
void Switch::try_send(cPacket *pkt, int gid) {
if (endTransmissionEvents[gid]->isScheduled()) {
// We are currently busy, so just queue up the packet.
// pkt->setTimestamp();
queues.try_emplace(gid, "queue", [](cObject *a, cObject *b) {
auto sa = (SwitchMLPacket*) a;
auto sb = (SwitchMLPacket*) b;
return sa->getPriority() - sb->getPriority();
}).first->second.insert(pkt);
emit(switchQueueLength, queues[gid].getLength());
emit(switchTotalQueueLength, ++total_queued_pkts);
// EV_DEBUG << "queued pkt slot " << ((SwitchMLPacket*) pkt)->getSlot()
// << endl;
} else {
// We are idle, so we can start transmitting right away.
startTransmitting(pkt, gid);
// EV_DEBUG << "start transmitting pkt slot "
// << ((SwitchMLPacket*) pkt)->getSlot() << endl;
}
}
void Switch::startTransmitting(cMessage *msg, int gid) {
port_isBusy[gid] = true;
send(msg, gid);
auto channel = channels[gid];
simtime_t endTransmission =
channel ? channel->getTransmissionFinishTime() : simTime();
scheduleAt(endTransmission, endTransmissionEvents[gid]);
// EV_DEBUG << "endTransmission scheduled at " << endTransmission << endl;
}
void Switch::multicast_downward(SwitchMLPacket *pkt) {
auto jid = pkt->getTensor_key().job_id;
// EV_DEBUG << "Switch " << getId() << " multicast downward pkt job " << jid
// << " gate ids: ";
for (auto gid : gate_ids_for_job[jid]) {
// EV_DEBUG << gid << " ";
pkt->setUpward(false);
pkt->setFrom_id(getId());
try_send(pkt->dup(), gid);
}
// EV_DEBUG << endl;
}
void Switch::handleMessage(cMessage *msg) {
if (msg->isSelfMessage()) {
auto pkt = (cPacket*) msg;
// Transmission finished, we can start next one.
// EV_DEBUG << "Transmission of gate " << pkt->getBitLength()
// << " finished at " << simTime() << endl;
auto gid = int(pkt->getBitLength());
auto &queue = queues.try_emplace(gid, "queue",
[](cObject *a, cObject *b) {
auto sa = (SwitchMLPacket*) a;
auto sb = (SwitchMLPacket*) b;
return sa->getPriority() - sb->getPriority();
}).first->second;
port_isBusy[gid] = false;
if (!queue.isEmpty()) {
// EV_DEBUG << "Start next transmission of gate " << gid << endl;
--total_queued_pkts;
startTransmitting((cMessage*) queue.pop(), gid);
}
return;
}
if (!msg->isPacket()) {
switch (msg->getKind()) {
case 6: {
// setup messages
auto setup = (Setup*) msg;
auto job_id = setup->getJob_id();
auto num_updates = setup->getIdsArraySize();
num_updates_for_job[job_id] = num_updates;
top_level_for_job[job_id] = setup->getTop_level();
for (size_t i = 0; i < num_updates; ++i) {
gate_ids_for_job[job_id].insert(gate_id[setup->getIds(i)]);
}
delete msg;
break;
}
default:
EV_DEBUG
<< fmt::format("wrong message of kind from {}\n",
msg->getKind(),
msg->getSenderModule()->getName());
delete msg;
EV_FATAL << "wrong message\n";
break;
}
return;
}
auto p = (SwitchMLPacket*) msg;
auto slot_ver = fmt::format("s{}v{}", p->getSlot(), p->getVer());
auto &count = count_for_tensor_key[p->getTensor_key()];
// EV_DEBUG << "Switch " << getId() << " get packet slot " << p->getSlot()
// << " at " << simTime() << endl;
if (p->getUpward()) {
auto &seen = seen_for_tensor_key[p->getTensor_key()];
auto &seen_key = seen[slot_ver];
auto jid = p->getTensor_key().job_id;
if (done_jobs.find(jid) != done_jobs.end()) {
// job done, drop pkt
delete p;
return;
}
auto from_id = p->getFrom_id();
if (seen_key.find(from_id) != seen_key.end()) { // shadow buffer
if (count[slot_ver] == p->getN_workers()) {
// send shadow buffer to p.id
EV_DEBUG << "Switch " << getId()
<< " getting and replying a shadow buffer request for slot "
<< p->getSlot() << " at " << simTime() << endl;
p->setUpward(false);
try_send(p, gate_id[from_id]);
return;
} else if (!top_level_for_job[jid] && count[slot_ver] == 0) {
// this switch does not have the shadow buffer requested, forwarding the request to upper level switch
EV_DEBUG << "Switch " << getId()
<< " getting and forwarding a shadow buffer request for slot "
<< p->getSlot() << " at " << simTime() << endl;
p->setFrom_id(getId());
try_send(p, gate("up_ports$o", 0)->getId());
return;
} else {
EV_FATAL << "Switch " << getId()
<< " received shadow buffer request but don't have that buffer available"
<< endl;
}
} else {
auto key_of_the_other_slot = fmt::format("s{}v{}", p->getSlot(),
1 - p->getVer());
seen_key.insert(from_id);
seen[key_of_the_other_slot].erase(from_id);
// std::cout << count[key] << " " << p->getN_workers() << " " << p->getJob_id() << " " << num_updates_for_job[p->getJob_id()] << std::endl;
count[slot_ver] = ((count[slot_ver] + 1) % p->getN_workers())
% num_updates_for_job[jid];
if (count[slot_ver] == 0) {
EV_DEBUG
<< fmt::format(
"Switch {} done slot {} offset {}\n",
getId(), p->getSlot(), p->getOffset());
// done aggregation for this slot
if (top_level_for_job[jid]) { // downward
count[slot_ver] = p->getN_workers();
multicast_downward(p);
} else { // upward
// send to upper level
p->setFrom_id(getId());
try_send(p, gate("up_ports$o", 0)->getId());
return;
}
} // else drop (free) packet
}
} else { // received from upper level switch
count[slot_ver] = p->getN_workers();
multicast_downward(p);
}
delete p;
}
Switch::~Switch() {
for (auto &pair : endTransmissionEvents) {
cancelAndDelete(pair.second);
}
}