1 /* Copyright (c) 2014-2019. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
10 #include "simgrid/kernel/routing/FatTreeZone.hpp"
11 #include "simgrid/kernel/routing/NetPoint.hpp"
12 #include "src/surf/network_interface.hpp"
13 #include "src/surf/xml/platf_private.hpp"
16 #include <boost/algorithm/string/classification.hpp>
17 #include <boost/algorithm/string/split.hpp>
19 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_route_fat_tree, surf, "Routing for fat trees");
25 FatTreeZone::FatTreeZone(NetZoneImpl* father, std::string name, resource::NetworkModel* netmodel)
26 : ClusterZone(father, name, netmodel)
28 XBT_DEBUG("Creating a new fat tree.");
31 FatTreeZone::~FatTreeZone()
33 for (unsigned int i = 0; i < this->nodes_.size(); i++) {
34 delete this->nodes_[i];
36 for (unsigned int i = 0; i < this->links_.size(); i++) {
37 delete this->links_[i];
41 bool FatTreeZone::is_in_sub_tree(FatTreeNode* root, FatTreeNode* node)
43 XBT_DEBUG("Is %d(%u,%u) in the sub tree of %d(%u,%u) ?", node->id, node->level, node->position, root->id, root->level,
45 if (root->level <= node->level) {
48 for (unsigned int i = 0; i < node->level; i++) {
49 if (root->label[i] != node->label[i]) {
54 for (unsigned int i = root->level; i < this->levels_; i++) {
55 if (root->label[i] != node->label[i]) {
62 void FatTreeZone::get_local_route(NetPoint* src, NetPoint* dst, RouteCreationArgs* into, double* latency)
65 if (dst->is_router() || src->is_router())
68 /* Let's find the source and the destination in our internal structure */
69 auto searchedNode = this->compute_nodes_.find(src->id());
70 xbt_assert(searchedNode != this->compute_nodes_.end(), "Could not find the source %s [%u] in the fat tree",
71 src->get_cname(), src->id());
72 FatTreeNode* source = searchedNode->second;
74 searchedNode = this->compute_nodes_.find(dst->id());
75 xbt_assert(searchedNode != this->compute_nodes_.end(), "Could not find the destination %s [%u] in the fat tree",
76 dst->get_cname(), dst->id());
77 FatTreeNode* destination = searchedNode->second;
79 XBT_VERB("Get route and latency from '%s' [%u] to '%s' [%u] in a fat tree", src->get_cname(), src->id(),
80 dst->get_cname(), dst->id());
82 /* In case destination is the source, and there is a loopback, let's use it instead of going up to a switch */
83 if (source->id == destination->id && this->has_loopback_) {
84 into->link_list.push_back(source->loopback);
86 *latency += source->loopback->get_latency();
90 FatTreeNode* currentNode = source;
93 while (not is_in_sub_tree(currentNode, destination)) {
94 int d = destination->position; // as in d-mod-k
96 for (unsigned int i = 0; i < currentNode->level; i++)
97 d /= this->num_parents_per_node_[i];
99 int k = this->num_parents_per_node_[currentNode->level];
101 into->link_list.push_back(currentNode->parents[d]->up_link_);
104 *latency += currentNode->parents[d]->up_link_->get_latency();
106 if (this->has_limiter_)
107 into->link_list.push_back(currentNode->limiter_link_);
108 currentNode = currentNode->parents[d]->up_node_;
111 XBT_DEBUG("%d(%u,%u) is in the sub tree of %d(%u,%u).", destination->id, destination->level, destination->position,
112 currentNode->id, currentNode->level, currentNode->position);
115 while (currentNode != destination) {
116 for (unsigned int i = 0; i < currentNode->children.size(); i++) {
117 if (i % this->num_children_per_node_[currentNode->level - 1] == destination->label[currentNode->level - 1]) {
118 into->link_list.push_back(currentNode->children[i]->down_link_);
120 *latency += currentNode->children[i]->down_link_->get_latency();
121 currentNode = currentNode->children[i]->down_node_;
122 if (this->has_limiter_)
123 into->link_list.push_back(currentNode->limiter_link_);
124 XBT_DEBUG("%d(%u,%u) is accessible through %d(%u,%u)", destination->id, destination->level,
125 destination->position, currentNode->id, currentNode->level, currentNode->position);
131 /* This function makes the assumption that parse_specific_arguments() and
132 * addNodes() have already been called
134 void FatTreeZone::seal()
136 if (this->levels_ == 0) {
139 this->generate_switches();
141 if (XBT_LOG_ISENABLED(surf_route_fat_tree, xbt_log_priority_debug)) {
142 std::stringstream msgBuffer;
144 msgBuffer << "We are creating a fat tree of " << this->levels_ << " levels "
145 << "with " << this->nodes_by_level_[0] << " processing nodes";
146 for (unsigned int i = 1; i <= this->levels_; i++) {
147 msgBuffer << ", " << this->nodes_by_level_[i] << " switches at level " << i;
149 XBT_DEBUG("%s", msgBuffer.str().c_str());
151 msgBuffer << "Nodes are : ";
153 for (unsigned int i = 0; i < this->nodes_.size(); i++) {
154 msgBuffer << this->nodes_[i]->id << "(" << this->nodes_[i]->level << "," << this->nodes_[i]->position << ") ";
156 XBT_DEBUG("%s", msgBuffer.str().c_str());
159 this->generate_labels();
162 // Nodes are totally ordered, by level and then by position, in this->nodes
163 for (unsigned int i = 0; i < this->levels_; i++) {
164 for (unsigned int j = 0; j < this->nodes_by_level_[i]; j++) {
165 this->connect_node_to_parents(this->nodes_[k]);
170 if (XBT_LOG_ISENABLED(surf_route_fat_tree, xbt_log_priority_debug)) {
171 std::stringstream msgBuffer;
172 msgBuffer << "Links are : ";
173 for (unsigned int i = 0; i < this->links_.size(); i++) {
174 msgBuffer << "(" << this->links_[i]->up_node_->id << "," << this->links_[i]->down_node_->id << ") ";
176 XBT_DEBUG("%s", msgBuffer.str().c_str());
180 int FatTreeZone::connect_node_to_parents(FatTreeNode* node)
182 std::vector<FatTreeNode*>::iterator currentParentNode = this->nodes_.begin();
183 int connectionsNumber = 0;
184 const int level = node->level;
185 XBT_DEBUG("We are connecting node %d(%u,%u) to his parents.", node->id, node->level, node->position);
186 currentParentNode += this->get_level_position(level + 1);
187 for (unsigned int i = 0; i < this->nodes_by_level_[level + 1]; i++) {
188 if (this->are_related(*currentParentNode, node)) {
189 XBT_DEBUG("%d(%u,%u) and %d(%u,%u) are related,"
190 " with %u links between them.",
191 node->id, node->level, node->position, (*currentParentNode)->id, (*currentParentNode)->level,
192 (*currentParentNode)->position, this->num_port_lower_level_[level]);
193 for (unsigned int j = 0; j < this->num_port_lower_level_[level]; j++) {
194 this->add_link(*currentParentNode, node->label[level] + j * this->num_children_per_node_[level], node,
195 (*currentParentNode)->label[level] + j * this->num_parents_per_node_[level]);
201 return connectionsNumber;
204 bool FatTreeZone::are_related(FatTreeNode* parent, FatTreeNode* child)
206 std::stringstream msgBuffer;
208 if (XBT_LOG_ISENABLED(surf_route_fat_tree, xbt_log_priority_debug)) {
209 msgBuffer << "Are " << child->id << "(" << child->level << "," << child->position << ") <";
211 for (unsigned int i = 0; i < this->levels_; i++) {
212 msgBuffer << child->label[i] << ",";
216 msgBuffer << " and " << parent->id << "(" << parent->level << "," << parent->position << ") <";
217 for (unsigned int i = 0; i < this->levels_; i++) {
218 msgBuffer << parent->label[i] << ",";
221 msgBuffer << " related ? ";
222 XBT_DEBUG("%s", msgBuffer.str().c_str());
224 if (parent->level != child->level + 1) {
228 for (unsigned int i = 0; i < this->levels_; i++) {
229 if (parent->label[i] != child->label[i] && i + 1 != parent->level) {
236 void FatTreeZone::generate_switches()
238 XBT_DEBUG("Generating switches.");
239 this->nodes_by_level_.resize(this->levels_ + 1, 0);
241 // Take care of the number of nodes by level
242 this->nodes_by_level_[0] = 1;
243 for (unsigned int i = 0; i < this->levels_; i++)
244 this->nodes_by_level_[0] *= this->num_children_per_node_[i];
246 if (this->nodes_by_level_[0] != this->nodes_.size()) {
247 surf_parse_error(std::string("The number of provided nodes does not fit with the wanted topology.") +
248 " Please check your platform description (We need " + std::to_string(this->nodes_by_level_[0]) +
249 "nodes, we got " + std::to_string(this->nodes_.size()));
253 for (unsigned int i = 0; i < this->levels_; i++) {
254 int nodesInThisLevel = 1;
256 for (unsigned int j = 0; j <= i; j++)
257 nodesInThisLevel *= this->num_parents_per_node_[j];
259 for (unsigned int j = i + 1; j < this->levels_; j++)
260 nodesInThisLevel *= this->num_children_per_node_[j];
262 this->nodes_by_level_[i + 1] = nodesInThisLevel;
265 // Create the switches
267 for (unsigned int i = 0; i < this->levels_; i++) {
268 for (unsigned int j = 0; j < this->nodes_by_level_[i + 1]; j++) {
269 FatTreeNode* newNode = new FatTreeNode(this->cluster_, --k, i + 1, j);
270 XBT_DEBUG("We create the switch %d(%u,%u)", newNode->id, newNode->level, newNode->position);
271 newNode->children.resize(this->num_children_per_node_[i] * this->num_port_lower_level_[i]);
272 if (i != this->levels_ - 1) {
273 newNode->parents.resize(this->num_parents_per_node_[i + 1] * this->num_port_lower_level_[i + 1]);
275 newNode->label.resize(this->levels_);
276 this->nodes_.push_back(newNode);
281 void FatTreeZone::generate_labels()
283 XBT_DEBUG("Generating labels.");
284 // TODO : check if nodesByLevel and nodes are filled
285 std::vector<int> maxLabel(this->levels_);
286 std::vector<int> currentLabel(this->levels_);
288 for (unsigned int i = 0; i <= this->levels_; i++) {
289 currentLabel.assign(this->levels_, 0);
290 for (unsigned int j = 0; j < this->levels_; j++) {
291 maxLabel[j] = j + 1 > i ? this->num_children_per_node_[j] : this->num_parents_per_node_[j];
294 for (unsigned int j = 0; j < this->nodes_by_level_[i]; j++) {
296 if (XBT_LOG_ISENABLED(surf_route_fat_tree, xbt_log_priority_debug)) {
297 std::stringstream msgBuffer;
299 msgBuffer << "Assigning label <";
300 for (unsigned int l = 0; l < this->levels_; l++) {
301 msgBuffer << currentLabel[l] << ",";
303 msgBuffer << "> to " << k << " (" << i << "," << j << ")";
305 XBT_DEBUG("%s", msgBuffer.str().c_str());
307 this->nodes_[k]->label.assign(currentLabel.begin(), currentLabel.end());
309 bool remainder = true;
310 unsigned int pos = 0;
311 while (remainder && pos < this->levels_) {
313 if (currentLabel[pos] >= maxLabel[pos]) {
314 currentLabel[pos] = 0;
327 int FatTreeZone::get_level_position(const unsigned int level)
329 xbt_assert(level <= this->levels_, "The impossible did happen. Yet again.");
330 int tempPosition = 0;
332 for (unsigned int i = 0; i < level; i++)
333 tempPosition += this->nodes_by_level_[i];
338 void FatTreeZone::add_processing_node(int id)
340 using std::make_pair;
341 static int position = 0;
342 FatTreeNode* newNode;
343 newNode = new FatTreeNode(this->cluster_, id, 0, position++);
344 newNode->parents.resize(this->num_parents_per_node_[0] * this->num_port_lower_level_[0]);
345 newNode->label.resize(this->levels_);
346 this->compute_nodes_.insert(make_pair(id, newNode));
347 this->nodes_.push_back(newNode);
350 void FatTreeZone::add_link(FatTreeNode* parent, unsigned int parentPort, FatTreeNode* child, unsigned int childPort)
352 FatTreeLink* newLink;
353 newLink = new FatTreeLink(this->cluster_, child, parent);
354 XBT_DEBUG("Creating a link between the parent (%u,%u,%u) and the child (%u,%u,%u)", parent->level, parent->position,
355 parentPort, child->level, child->position, childPort);
356 parent->children[parentPort] = newLink;
357 child->parents[childPort] = newLink;
359 this->links_.push_back(newLink);
362 void FatTreeZone::parse_specific_arguments(ClusterCreationArgs* cluster)
364 std::vector<std::string> parameters;
365 std::vector<std::string> tmp;
366 boost::split(parameters, cluster->topo_parameters, boost::is_any_of(";"));
367 const std::string error_msg {"Fat trees are defined by the levels number and 3 vectors, see the documentation for more information"};
369 // TODO : we have to check for zeros and negative numbers, or it might crash
370 if (parameters.size() != 4) {
371 surf_parse_error(error_msg);
374 // The first parts of topo_parameters should be the levels number
376 this->levels_ = std::stoi(parameters[0]);
377 } catch (std::invalid_argument& ia) {
378 throw std::invalid_argument(std::string("First parameter is not the amount of levels:") + parameters[0]);
381 // Then, a l-sized vector standing for the children number by level
382 boost::split(tmp, parameters[1], boost::is_any_of(","));
383 if (tmp.size() != this->levels_) {
384 surf_parse_error(error_msg);
386 for (size_t i = 0; i < tmp.size(); i++) {
388 this->num_children_per_node_.push_back(std::stoi(tmp[i]));
389 } catch (std::invalid_argument& ia) {
390 throw std::invalid_argument(std::string("Invalid lower level node number:") + tmp[i]);
394 // Then, a l-sized vector standing for the parents number by level
395 boost::split(tmp, parameters[2], boost::is_any_of(","));
396 if (tmp.size() != this->levels_) {
397 surf_parse_error(error_msg);
399 for (size_t i = 0; i < tmp.size(); i++) {
401 this->num_parents_per_node_.push_back(std::stoi(tmp[i]));
402 } catch (std::invalid_argument& ia) {
403 throw std::invalid_argument(std::string("Invalid upper level node number:") + tmp[i]);
407 // Finally, a l-sized vector standing for the ports number with the lower level
408 boost::split(tmp, parameters[3], boost::is_any_of(","));
409 if (tmp.size() != this->levels_) {
410 surf_parse_error(error_msg);
412 for (size_t i = 0; i < tmp.size(); i++) {
414 this->num_port_lower_level_.push_back(std::stoi(tmp[i]));
415 } catch (std::invalid_argument& ia) {
416 throw std::invalid_argument(std::string("Invalid lower level port number:") + tmp[i]);
419 this->cluster_ = cluster;
422 void FatTreeZone::generate_dot_file(const std::string& filename) const
425 file.open(filename, std::ios::out | std::ios::trunc);
426 xbt_assert(file.is_open(), "Unable to open file %s", filename.c_str());
428 file << "graph AsClusterFatTree {\n";
429 for (unsigned int i = 0; i < this->nodes_.size(); i++) {
430 file << this->nodes_[i]->id;
431 if (this->nodes_[i]->id < 0)
432 file << " [shape=circle];\n";
434 file << " [shape=hexagon];\n";
437 for (unsigned int i = 0; i < this->links_.size(); i++) {
438 file << this->links_[i]->down_node_->id << " -- " << this->links_[i]->up_node_->id << ";\n";
444 FatTreeNode::FatTreeNode(ClusterCreationArgs* cluster, int id, int level, int position)
445 : id(id), level(level), position(position)
447 LinkCreationArgs linkTemplate;
448 if (cluster->limiter_link) {
449 linkTemplate.bandwidth = cluster->limiter_link;
450 linkTemplate.latency = 0;
451 linkTemplate.policy = s4u::Link::SharingPolicy::SHARED;
452 linkTemplate.id = "limiter_"+std::to_string(id);
453 sg_platf_new_link(&linkTemplate);
454 this->limiter_link_ = s4u::Link::by_name(linkTemplate.id)->get_impl();
456 if (cluster->loopback_bw || cluster->loopback_lat) {
457 linkTemplate.bandwidth = cluster->loopback_bw;
458 linkTemplate.latency = cluster->loopback_lat;
459 linkTemplate.policy = s4u::Link::SharingPolicy::FATPIPE;
460 linkTemplate.id = "loopback_"+ std::to_string(id);
461 sg_platf_new_link(&linkTemplate);
462 this->loopback = s4u::Link::by_name(linkTemplate.id)->get_impl();
466 FatTreeLink::FatTreeLink(ClusterCreationArgs* cluster, FatTreeNode* downNode, FatTreeNode* upNode)
467 : up_node_(upNode), down_node_(downNode)
469 static int uniqueId = 0;
470 LinkCreationArgs linkTemplate;
471 linkTemplate.bandwidth = cluster->bw;
472 linkTemplate.latency = cluster->lat;
473 linkTemplate.policy = cluster->sharing_policy; // sthg to do with that ?
475 "link_from_" + std::to_string(downNode->id) + "_" + std::to_string(upNode->id) + "_" + std::to_string(uniqueId);
476 sg_platf_new_link(&linkTemplate);
478 if (cluster->sharing_policy == s4u::Link::SharingPolicy::SPLITDUPLEX) {
479 this->up_link_ = s4u::Link::by_name(linkTemplate.id + "_UP")->get_impl(); // check link?
480 this->down_link_ = s4u::Link::by_name(linkTemplate.id + "_DOWN")->get_impl(); // check link ?
482 this->up_link_ = s4u::Link::by_name(linkTemplate.id)->get_impl();
483 this->down_link_ = this->up_link_;