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noc.cpp
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noc.cpp
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#include <iostream>
#include <iomanip>
#include <climits>
#include <cfloat>
#include "noc.h"
// ----------------------------------------------------------------------
NoC::NoC(void)
{
}
// ----------------------------------------------------------------------
bool NoC::searchClock(ifstream& f, float& cf)
{
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (sscanf(line.c_str(), "clock: %f", &cf) == 1)
return true;
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchNoCSize(ifstream& f, int& w, int& h)
{
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (sscanf(line.c_str(), "size: %dx%d", &w, &h) == 2)
return true;
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchRouting(ifstream& f, int& ra)
{
char rstr[256];
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (sscanf(line.c_str(), "routing: %s", rstr) == 1)
{
if (strcmp(rstr, "xy") == 0)
ra = ROUTING_XY;
else if (strcmp(rstr, "fa") == 0)
ra = ROUTING_FA;
else
return false;
return true;
}
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchNodeMapping(ifstream& f, int& nm)
{
char rstr[256];
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (sscanf(line.c_str(), "node_mapping: %s", rstr) == 1)
{
if (strcmp(rstr, "zigzag") == 0)
nm = MAP_ZIGZAG;
else if (strcmp(rstr, "diagonal") == 0)
nm = MAP_DIAGONAL;
else
return false;
return true;
}
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchLocalMemory(ifstream& f, int& lms, double& epb, double& leakpwr)
{
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (sscanf(line.c_str(), "local_memory: %d,%lf,%lf",
&lms, &epb, &leakpwr) == 3)
return true;
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchMainMemory(ifstream& f, float& bw, double& epb, double& leakpwr)
{
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (sscanf(line.c_str(), "main_memory: %f,%lf,%lf", &bw, &epb, &leakpwr) == 3)
return true;
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchRouter(ifstream& f, int& rl, double& epb, double& leakpwr)
{
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (sscanf(line.c_str(), "router: %d,%lf,%lf", &rl, &epb, &leakpwr) == 3)
return true;
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchLink(ifstream& f, int& lw, double& epb, double& leakpwr)
{
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (sscanf(line.c_str(), "link: %d,%lf,%lf", &lw, &epb, &leakpwr) == 3)
return true;
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchGRSLink(ifstream& f, int& lw, double& epb, double& leakpwr)
{
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (sscanf(line.c_str(), "grslink: %d,%lf,%lf", &lw, &epb, &leakpwr) == 3)
return true;
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchPE(ifstream& f, int& macopc, int& poolopc,
double& epop_mac, double& epop_pool,
double& leakpwr)
{
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (sscanf(line.c_str(), "pe: %d,%d,%lf,%lf,%lf", &macopc, &poolopc,
&epop_mac, &epop_pool, &leakpwr) == 5)
return true;
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchMemoryInterfaces(ifstream& f, TNodeSet& mi)
{
f.clear();
f.seekg(0, ios::beg);
string line;
bool found = false;
while (!f.eof() && !found)
{
getline(f, line);
if (strncmp(line.c_str(), "memory_interface:", 17) == 0)
found = true;
}
if (!found)
return false;
mi.clear();
while (!f.eof())
{
getline(f, line);
int node;
if (sscanf(line.c_str(), "%d", &node) == 1)
mi.insert(node);
}
return (mi.size() != 0);
}
// ----------------------------------------------------------------------
void NoC::searchRadioHubs(ifstream& f, TRadioHubSet& rh)
{
f.clear();
f.seekg(0, ios::beg);
string line;
bool found = false;
while (!f.eof() && !found)
{
getline(f, line);
if (strncmp(line.c_str(), "radio_hub:", 10) == 0)
found = true;
}
if (!found)
return;
rh.clear();
char rh_name[32];
while (!f.eof())
{
getline(f, line);
int node, x1, y1, x2, y2;
if (sscanf(line.c_str(), "%s %d,%d %d,%d", rh_name, &x1, &y1, &x2, &y2) == 5)
{
for (int x=x1; x<=x2; x++)
for (int y=y1; y<=y2; y++)
{
node = coord2node(pair<int,int>(y, x));
rh[string(rh_name)].insert(node);
}
}
else
break;
}
}
// ----------------------------------------------------------------------
void NoC::searchGRSLinksPositions(ifstream& f, TGRSLinksPositionsSet& grslinks_pos)
{
f.clear();
f.seekg(0, ios::beg);
string line;
bool found = false;
while (!f.eof() && !found)
{
getline(f, line);
if (strncmp(line.c_str(), "grslink_pos:", 12) == 0)
found = true;
}
if (!found)
return;
grslinks_pos.clear();
while (!f.eof())
{
getline(f, line);
int rc, first, last;
char dir[16];
if (sscanf(line.c_str(), "%s %d,%d..%d", dir, &rc, &first, &last) == 4)
{
if (strcmp(dir, "h") == 0)
for (int r=first; r<=last; r++)
{
int n1 = coord2node(pair<int,int>(r, rc));
int n2 = coord2node(pair<int,int>(r, rc+1));
grslinks_pos.insert(pair<int,int>(n1, n2));
grslinks_pos.insert(pair<int,int>(n2, n1));
}
else if (strcmp(dir, "v") == 0)
for (int c=first; c<=last; c++)
{
int n1 = coord2node(pair<int,int>(rc, c));
int n2 = coord2node(pair<int,int>(rc+1, c));
grslinks_pos.insert(pair<int,int>(n1, n2));
grslinks_pos.insert(pair<int,int>(n2, n1));
}
}
else
break;
}
}
// ----------------------------------------------------------------------
bool NoC::searchWiNoCUsage(ifstream& f)
{
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (strncmp(line.c_str(), "use_winoc", 9) == 0)
return true;
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchMulticastUsage(ifstream& f)
{
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (strncmp(line.c_str(), "use_multicast", 13) == 0)
return true;
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchGRSLinksUsage(ifstream& f)
{
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (strncmp(line.c_str(), "use_grslinks", 12) == 0)
return true;
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::searchWiNoCData(ifstream& f, float& bw, double& epb, double& leakpwr)
{
f.clear();
f.seekg(0, ios::beg);
string line;
while (!f.eof())
{
getline(f, line);
if (sscanf(line.c_str(), "wireless: %f,%lf,%lf",
&bw, &epb, &leakpwr) == 3)
return true;
}
return false;
}
// ----------------------------------------------------------------------
bool NoC::loadNoC(const string& fname)
{
// initialize no mandatory data during (e.g., those related to winoc)
epb_wireless = 0.0;
leak_pwr_wireless = 0.0;
wireless_bandwidth = 0.0;
epb_grslink = 0.0;
leak_pwr_grslink = 0.0;
one_hop_wireless = INT_MAX;
cout << "Reading " << fname << "..." << endl;
ifstream f(fname);
if (f.fail())
return false;
if (!searchClock(f, clock_frequency))
{
cerr << "Unspecified clock frequency or invalid format" << endl;
return false;
}
if (!searchNoCSize(f, mesh_width, mesh_height))
{
cerr << "Unspecified NoC size or invalid format" << endl;
return false;
}
if (!searchRouting(f, routing))
{
cerr << "Unspecified routing type or invalid format" << endl;
return false;
}
if (!searchLocalMemory(f, local_memory_size, epb_lmemory, leak_pwr_lmemory))
{
cerr << "Unspecified local memory or invalid format" << endl;
return false;
}
if (!searchMainMemory(f, memory_bandwidth, epb_mmemory, leak_pwr_mmemory))
{
cerr << "Unspecified main memory or invalid format" << endl;
return false;
}
if (!searchPE(f, macopc, poolopc, epop_mac, epop_pool, leak_pwr_pe))
{
cerr << "Unspecified PE or invalid format" << endl;
return false;
}
if (!searchRouter(f, router_latency, epb_router, leak_pwr_router))
{
cerr << "Unspecified router or invalid format" << endl;
return false;
}
if (!searchLink(f, link_width, epb_link, leak_pwr_link))
{
cerr << "Unspecified link or invalid format" << endl;
return false;
}
if (!searchMemoryInterfaces(f, memory_interfaces))
{
cerr << "Unspecified memory interfaces or invalid format" << endl;
return false;
}
use_grslinks = searchGRSLinksUsage(f);
if (use_grslinks)
{
searchGRSLinksPositions(f, grslinks_pos);
if (!grslinks_pos.empty())
if (!searchGRSLink(f, grslink_width, epb_grslink, leak_pwr_grslink))
{
cerr << "Unspecified GRS link or invalid format" << endl;
return false;
}
}
use_multicast = searchMulticastUsage(f);
use_winoc = searchWiNoCUsage(f);
if (use_winoc)
{
searchRadioHubs(f, radio_hubs);
if (!radio_hubs.empty())
if (!searchWiNoCData(f, wireless_bandwidth, epb_wireless, leak_pwr_wireless))
{
cerr << "Unspecified wireless data or invalid format" << endl;
return false;
}
}
if (!searchNodeMapping(f, node_mapping))
{
cerr << "Unspecified node mapping or invalid format" << endl;
return false;
}
makePE2Node(); // must call before makeLinks
makeRH2Node(); // must call before makeLinks
makeLinks();
makeClosestMIMap(); // must call after makePE2Node
return true;
}
// ----------------------------------------------------------------------
int NoC::node2pe(int node)
{
for (map<int,int>::iterator i=pe2node.begin(); i!=pe2node.end(); i++)
if (i->second == node)
return i->first;
return -1;
}
// ----------------------------------------------------------------------
int NoC::coord2node(const pair<int,int>& coord)
{
return coord.first * mesh_width + coord.second;
}
// ----------------------------------------------------------------------
pair<int,int> NoC::node2coord(int node)
{
pair<int,int> coord(node / mesh_width, node % mesh_width);
return coord;
}
// ----------------------------------------------------------------------
void NoC::makeClosestMIMap()
{
closest_mi.clear();
int num_pe = getNumberOfCores();
for (int pe_id=0; pe_id<num_pe; pe_id++)
{
int node_id = pe2node.at(pe_id);
closest_mi[node_id] = closestMI(node_id);
}
}
// ----------------------------------------------------------------------
void NoC::makeLinks()
{
makeWiredLinks();
makeWirelessLinks();
makeGRSLinks();
}
// ----------------------------------------------------------------------
void NoC::makeWiredLinks()
{
links.clear();
TLinkAttr lattr;
lattr.total_load = 0;
// lattr.ncomms = 0;
lattr.link_type = LT_WIRED;
// horizontal links
for (int r=0; r<mesh_height; r++)
{
for (int c=0; c<mesh_width-1; c++)
{
pair<int,int> l(coord2node(pair<int,int>(r,c)),
coord2node(pair<int,int>(r,c+1)));
links[l] = lattr;
}
for (int c=1; c<mesh_width; c++)
{
pair<int,int> l(coord2node(pair<int,int>(r,c)),
coord2node(pair<int,int>(r,c-1)));
links[l] = lattr;
}
}
// vertical links
for (int c=0; c<mesh_width; c++)
{
for (int r=0; r<mesh_height-1; r++)
{
pair<int,int> l(coord2node(pair<int,int>(r,c)),
coord2node(pair<int,int>(r+1,c)));
links[l] = lattr;
}
for (int r=1; r<mesh_height; r++)
{
pair<int,int> l(coord2node(pair<int,int>(r,c)),
coord2node(pair<int,int>(r-1,c)));
links[l] = lattr;
}
}
// links to radio-hubs
if (radio_hubs.empty())
return;
for (TRadioHubSet::iterator rhi = radio_hubs.begin();
rhi != radio_hubs.end(); rhi++)
for (TNodeSet::iterator ni=rhi->second.begin();
ni != rhi->second.end(); ni++)
{
assert(rh2node.find(rhi->first) != rh2node.end());
int rh_node = rh2node[rhi->first];
pair<int,int> l1(rh_node, *ni);
pair<int,int> l2(*ni, rh_node);
links[l1] = lattr;
links[l2] = lattr;
}
}
// ----------------------------------------------------------------------
void NoC::makeWirelessLinks()
{
if (radio_hubs.empty())
return;
TLinkAttr lattr;
lattr.link_type = LT_WIRELESS;
// lattr.ncomms = 0;
lattr.total_load = 0;
for (TRadioHubSet::iterator rh1 = radio_hubs.begin();
rh1 != radio_hubs.end(); rh1++)
for (TRadioHubSet::iterator rh2 = radio_hubs.begin();
rh2 != radio_hubs.end(); rh2++)
if (rh1 != rh2)
{
assert(rh2node.find(rh1->first) != rh2node.end());
assert(rh2node.find(rh2->first) != rh2node.end());
pair<int,int> l(rh2node[rh1->first], rh2node[rh2->first]);
links[l] = lattr;
}
one_hop_wireless = clock_frequency * link_width / wireless_bandwidth;
}
// ----------------------------------------------------------------------
void NoC::makeGRSLinks()
{
for (TGRSLinksPositionsSet::iterator l = grslinks_pos.begin();
l != grslinks_pos.end(); l++)
{
assert(links.find(*l) != links.end());
links[*l].link_type = LT_GRS;
}
}
// ----------------------------------------------------------------------
void NoC::makePE2Node()
{
if (node_mapping == MAP_ZIGZAG)
makePE2NodeZigZag();
else if (node_mapping == MAP_DIAGONAL)
makePE2NodeDiagonal();
else assert(false);
}
// ----------------------------------------------------------------------
void NoC::makePE2NodeZigZag()
{
pe2node.clear();
int pe_count = 0;
for (int r=0; r<mesh_height; r++)
for (int c=0; c<mesh_width; c++)
{
int node = coord2node(TCoordinate(r,c));
if (memory_interfaces.find(node) == memory_interfaces.end())
{
pe2node[pe_count] = node;
pe_count++;
}
}
}
// ----------------------------------------------------------------------
void NoC::makePE2NodeDiagonal()
{
pe2node.clear();
int pe_count = 0;
for (int n=0; n<mesh_width*2; n++)
{
for (int i=0; i<=n; i++)
{
int r = i;
int c = n - i;
if (r >= mesh_height || c >= mesh_width)
continue;
int node = coord2node(TCoordinate(r,c));
if (memory_interfaces.find(node) == memory_interfaces.end())
{
pe2node[pe_count] = node;
pe_count++;
}
}
}
}
// ----------------------------------------------------------------------
void NoC::makeRH2Node()
{
int node = mesh_width * mesh_height;
for (TRadioHubSet::iterator i=radio_hubs.begin();
i != radio_hubs.end(); i++)
{
rh2node[i->first] = node;
node++;
}
}
// ----------------------------------------------------------------------
int NoC::getNumberOfCores()
{
return (mesh_width * mesh_height) - memory_interfaces.size();
}
// ----------------------------------------------------------------------
int NoC::getNumberOfMIs()
{
return memory_interfaces.size();
}
// ----------------------------------------------------------------------
void NoC::showNoC()
{
cout << endl
<< "NoC, Memory and PE" << endl
<< "==============================" << endl;
cout << "clock frequency: " << (clock_frequency/1e6) << " MHz" << endl
<< "mesh size: " << mesh_width << "x" << mesh_height
<< " (" << getNumberOfCores() << " cores, "
<< getNumberOfMIs() << " memory interfaces)" << endl
<< "local memory size: " << (local_memory_size/1024) << " KB" << endl
<< "main memory bandwidth: " << (memory_bandwidth/1e9) << " GBps (" << getMainMemoryBandwidth() << " Bpc)" << endl
<< "link width / bandwidth: " << link_width << " bits / "
<< (clock_frequency * (link_width/8) / 1e9) << " GBps" << endl
<< "router latency: " << router_latency << " cycles" << endl
<< "use multicast: " << use_multicast << endl
<< "MAC/Pool operations per cycle: " << macopc << ", " << poolopc << endl
<< "Energy per bit link/router: " << epb_link << "/" << epb_router << " J" << endl
<< "Energy per bit main memory: " << epb_mmemory << " J" << endl
<< "Energy per bit local memory: " << epb_lmemory << " J" << endl
<< "Energy per operation MAC/Pool: " << epop_mac << "/" << epop_pool << " J" << endl
<< "Leakage power link/router/PE/lmem/mmem: " << leak_pwr_link << "/" << leak_pwr_router << "/" << leak_pwr_pe << "/" << leak_pwr_lmemory << "/" << leak_pwr_mmemory << " W" << endl
<< "memory interfaces: ";
for (TNodeSet::iterator i=memory_interfaces.begin();
i!=memory_interfaces.end(); i++)
cout << *i << ", ";
cout << endl;
if (use_winoc)
{
cout << endl
<< "WiNoC" << endl
<< "==============================" << endl;
cout << "Bandwidth: " << wireless_bandwidth/1.0E9 << " Gbps" << endl;
cout << "One hop wireless: " << one_hop_wireless << " cycles" << endl;
if (!radio_hubs.empty())
{
cout << "WiNoC architecture" << endl;
for (TRadioHubSet::iterator i=radio_hubs.begin();
i != radio_hubs.end(); i++)
{
cout << "\t" << i->first << "(" << rh2node[i->first] << ") connected to ";
for (TNodeSet::iterator j=i->second.begin();
j != i->second.end(); j++)
cout << *j << ", ";
cout << endl;
}
}
}
if (use_grslinks)
{
cout << endl
<< "GRS" << endl
<< "==============================" << endl;
cout << "Link width: " << grslink_width << " bits" << endl;
if (!grslinks_pos.empty())
{
cout << "GRS links: ";
for (TGRSLinksPositionsSet::iterator l=grslinks_pos.begin();
l != grslinks_pos.end(); l++)
cout << l->first << "->" << l->second << ", ";
cout << endl;
}
}
}
// ----------------------------------------------------------------------
void NoC::showTopology()
{
cout << endl
<< "Topology" << endl
<< "==============================" << endl;
for (int r=0; r<mesh_height; r++)
{
for (int c=0; c<mesh_width; c++)
{
int node = coord2node(TCoordinate(r,c));
if (memory_interfaces.find(node) != memory_interfaces.end())
cout << "(" << left << setw(3) << node << "MI " << ") ";
else
cout << "(" << left << setw(3) << node << "PE" << setw(3) << node2pe(node) << ") ";
}
cout << endl;
}
}
// ----------------------------------------------------------------------
int NoC::getMainMemoryBandwidth()
{
return (memory_bandwidth/clock_frequency);
}
// ----------------------------------------------------------------------
void NoC::resetLinks()
{
for (TLinks::iterator l=links.begin(); l!=links.end(); l++)
{
l->second.total_load = 0;
// l->second.ncomms = 0;
l->second.comm_ids.clear();
}
}
// ----------------------------------------------------------------------
TPath NoC::getRoutingPath(int src_node, int dst_node)
{
if (routing == ROUTING_XY)
return getRoutingPathXY(src_node, dst_node);
else if (routing == ROUTING_FA)
return getRoutingPathFA(src_node, dst_node);
else
assert(true);
return TPath();
}
// ----------------------------------------------------------------------
TPath NoC::getRoutingPathXY(int src_node, int dst_node)
{
if (radio_hubs.empty())
return getRoutingPathXYWired(src_node, dst_node);
else
return getRoutingPathXYWireless(src_node, dst_node);
}
// ----------------------------------------------------------------------
TPath NoC::getRoutingPathXYWired(int src_node, int dst_node)
{
TPath path;
pair<int,int> coord_s = node2coord(src_node);
pair<int,int> coord_d = node2coord(dst_node);
int delta;
// routing X
if (coord_d.second > coord_s.second)
delta = 1;
else if (coord_d.second < coord_s.second)
delta = -1;
else delta = 0;
int col = coord_s.second;
while (col != coord_d.second)
{
int node1 = coord2node(pair<int,int>(coord_s.first, col));
col += delta;
int node2 = coord2node(pair<int,int>(coord_s.first, col));
path.push_back(pair<int,int>(node1,node2));
}
// routing Y
if (coord_d.first > coord_s.first)
delta = 1;
else if (coord_d.first < coord_s.first)
delta = -1;
else delta = 0;
int row = coord_s.first;
while (row != coord_d.first)
{
int node1 = coord2node(pair<int,int>(row, coord_d.second));
row += delta;
int node2 = coord2node(pair<int,int>(row, coord_d.second));
path.push_back(pair<int,int>(node1,node2));
}
return path;
}
// ----------------------------------------------------------------------
TPath NoC::getRoutingPathXYWireless(int src_node, int dst_node)
{
int hops_only_wired = getDistance(src_node, dst_node);
if (hops_only_wired < one_hop_wireless)
return getRoutingPathXYWired(src_node, dst_node);
pair<int,int> rh_node_src = getClosestRHNode(src_node); // (attached node, rh)
pair<int,int> rh_node_dst = getClosestRHNode(dst_node); // (attached node, rh)
if (rh_node_src.second == rh_node_dst.second)
return getRoutingPathXYWired(src_node, dst_node);
int hops_wireless = getDistance(src_node, rh_node_src.first) +
1 + // from attached node to rh to rh
one_hop_wireless + // equivalent wired hops
1 + // from rh to attached node to rh
getDistance(rh_node_dst.first, dst_node);
if (hops_only_wired < hops_wireless)
return getRoutingPathXYWired(src_node, dst_node);
TPath wired_path_src_to_rh = getRoutingPathXYWired(src_node, rh_node_src.first);
TPath wired_path_rh_to_dst = getRoutingPathXYWired(rh_node_dst.first, dst_node);
// create wireless path
TPath wireless_path;
pair<int,int> link_attached_node_to_rh_src(rh_node_src.first,
rh_node_src.second);
pair<int,int> wireless_link(rh_node_src.second, rh_node_dst.second);
pair<int,int> link_rh_dst_to_attached_node(rh_node_dst.second,
rh_node_dst.first);
wireless_path.insert(wireless_path.end(),
wired_path_src_to_rh.begin(), wired_path_src_to_rh.end());
wireless_path.push_back(link_attached_node_to_rh_src);
wireless_path.push_back(wireless_link);
wireless_path.push_back(link_rh_dst_to_attached_node);