1 /* Copyright (c) 2014-2016. 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. */
6 #include "src/kernel/routing/AsClusterTorus.hpp"
7 #include "src/kernel/routing/NetCard.hpp"
9 #include "src/surf/network_interface.hpp"
10 #include "src/surf/xml/platf.hpp" // FIXME: move that back to the parsing area
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_route_cluster_torus, surf_route_cluster, "Torus Routing part of surf");
14 inline unsigned int *rankId_to_coords(int rankId, xbt_dynar_t dimensions)
17 unsigned int i = 0, cur_dim_size = 1, dim_size_product = 1;
18 unsigned int *coords = (unsigned int *) malloc(xbt_dynar_length(dimensions) * sizeof(unsigned int));
19 for (i = 0; i < xbt_dynar_length(dimensions); i++) {
20 cur_dim_size = xbt_dynar_get_as(dimensions, i, int);
21 coords[i] = (rankId / dim_size_product) % cur_dim_size;
22 dim_size_product *= cur_dim_size;
32 AsClusterTorus::AsClusterTorus(As* father, const char* name) : AsCluster(father, name)
35 AsClusterTorus::~AsClusterTorus() {
36 xbt_dynar_free(&dimensions_);
39 void AsClusterTorus::create_links_for_node(sg_platf_cluster_cbarg_t cluster, int id, int rank, int position) {
43 * Create all links that exist in the torus.
44 * Each rank creates @a dimensions-1 links
46 int neighbor_rank_id = 0; // The other node the link connects
47 int current_dimension = 0, // which dimension are we currently in?
48 // we need to iterate over all dimensions
49 // and create all links there
50 dim_product = 1; // Needed to calculate the next neighbor_id
51 for (j = 0; j < xbt_dynar_length(dimensions_); j++) {
53 s_sg_platf_link_cbarg_t link;
54 memset(&link, 0, sizeof(link));
55 current_dimension = xbt_dynar_get_as(dimensions_, j, int);
56 neighbor_rank_id = (((int)rank / dim_product) % current_dimension == current_dimension - 1)
57 ? rank - (current_dimension - 1) * dim_product
59 //name of neighbor is not right for non contiguous cluster radicals (as id != rank in this case)
60 link_id = bprintf("%s_link_from_%i_to_%i", cluster->id, id, neighbor_rank_id);
62 link.bandwidth = cluster->bw;
63 link.latency = cluster->lat;
64 link.policy = cluster->sharing_policy;
65 sg_platf_new_link(&link);
66 s_surf_parsing_link_up_down_t info;
67 if (link.policy == SURF_LINK_FULLDUPLEX) {
68 char *tmp_link = bprintf("%s_UP", link_id);
69 info.linkUp = Link::byName(tmp_link);
71 tmp_link = bprintf("%s_DOWN", link_id);
72 info.linkDown = Link::byName(tmp_link);
75 info.linkUp = Link::byName(link_id);
76 info.linkDown = info.linkUp;
79 * Add the link to its appropriate position;
80 * note that position rankId*(xbt_dynar_length(dimensions)+has_loopback?+has_limiter?)
81 * holds the link "rankId->rankId"
83 privateLinks_.insert({position + j, {info.linkUp, info.linkDown}});
84 dim_product *= current_dimension;
90 void AsClusterTorus::parse_specific_arguments(sg_platf_cluster_cbarg_t cluster) {
94 xbt_dynar_t dimensions = xbt_str_split(cluster->topo_parameters, ",");
96 if (!xbt_dynar_is_empty(dimensions)) {
97 dimensions_ = xbt_dynar_new(sizeof(int), nullptr);
98 /* We are in a torus cluster
99 * Parse attribute dimensions="dim1,dim2,dim3,...,dimN"
100 * and safe it in a dynarray.
101 * Additionally, we need to know how many ranks we have in total
103 xbt_dynar_foreach(dimensions, iter, groups) {
104 int tmp = surf_parse_get_int(xbt_dynar_get_as(dimensions, iter, char *));
105 xbt_dynar_set_as(dimensions_, iter, int, tmp);
108 linkCountPerNode_ = xbt_dynar_length(dimensions_);
111 xbt_dynar_free(&dimensions);
114 void AsClusterTorus::getLocalRoute(NetCard* src, NetCard* dst, sg_platf_route_cbarg_t route, double* lat)
117 XBT_VERB("torus getLocalRoute from '%s'[%d] to '%s'[%d]", src->name().c_str(), src->id(), dst->name().c_str(),
120 if (dst->isRouter() || src->isRouter())
123 if (src->id() == dst->id() && hasLoopback_) {
124 std::pair<Link*, Link*> info = privateLinks_.at(src->id() * linkCountPerNode_);
126 route->link_list->push_back(info.first);
128 *lat += info.first->latency();
134 * Dimension based routing routes through each dimension consecutively
135 * TODO Change to dynamic assignment
137 unsigned int j, cur_dim, dim_product = 1;
138 unsigned int current_node = src->id();
139 unsigned int next_node = 0;
141 * Arrays that hold the coordinates of the current node and
142 * the target; comparing the values at the i-th position of
143 * both arrays, we can easily assess whether we need to route
144 * into this dimension or not.
146 unsigned int* myCoords = rankId_to_coords(src->id(), dimensions_);
147 unsigned int* targetCoords = rankId_to_coords(dst->id(), dimensions_);
149 * linkOffset describes the offset where the link
150 * we want to use is stored
151 * (+1 is added because each node has a link from itself to itself,
152 * which can only be the case if src->m_id == dst->m_id -- see above
153 * for this special case)
155 int nodeOffset = (xbt_dynar_length(dimensions_) + 1) * src->id();
157 int linkOffset = nodeOffset;
158 bool use_lnk_up = false; // Is this link of the form "cur -> next" or "next -> cur"?
159 // false means: next -> cur
160 while (current_node != dst->id()) {
161 dim_product = 1; // First, we will route in x-dimension
162 for (j = 0; j < xbt_dynar_length(dimensions_); j++) {
163 cur_dim = xbt_dynar_get_as(dimensions_, j, int);
165 // current_node/dim_product = position in current dimension
166 if ((current_node / dim_product) % cur_dim != (dst->id() / dim_product) % cur_dim) {
168 if ((targetCoords[j] > myCoords[j] && targetCoords[j] <= myCoords[j] + cur_dim / 2) // Is the target node on the right, without the wrap-around?
169 || (myCoords[j] > cur_dim / 2 && (myCoords[j] + cur_dim / 2) % cur_dim >= targetCoords[j])) { // Or do we need to use the wrap around to reach it?
170 if ((current_node / dim_product) % cur_dim == cur_dim - 1)
171 next_node = (current_node + dim_product - dim_product * cur_dim);
173 next_node = (current_node + dim_product);
175 // HERE: We use *CURRENT* node for calculation (as opposed to next_node)
176 nodeOffset = current_node * (linkCountPerNode_);
177 linkOffset = nodeOffset + (hasLoopback_?1:0) + (hasLimiter_?1:0) + j;
179 assert(linkOffset >= 0);
180 } else { // Route to the left
181 if ((current_node / dim_product) % cur_dim == 0)
182 next_node = (current_node - dim_product + dim_product * cur_dim);
184 next_node = (current_node - dim_product);
186 // HERE: We use *next* node for calculation (as opposed to current_node!)
187 nodeOffset = next_node * (linkCountPerNode_);
188 linkOffset = nodeOffset + j + (hasLoopback_?1:0) + (hasLimiter_?1:0) ;
191 assert(linkOffset >= 0);
193 XBT_DEBUG("torus_get_route_and_latency - current_node: %i, next_node: %u, linkOffset is %i",
194 current_node, next_node, linkOffset);
199 dim_product *= cur_dim;
202 std::pair<Link*, Link*> info;
204 if (hasLimiter_) { // limiter for sender
205 info = privateLinks_.at(nodeOffset + hasLoopback_);
206 route->link_list->push_back(info.first);
209 info = privateLinks_.at(linkOffset);
211 if (use_lnk_up == false) {
212 route->link_list->push_back(info.second);
214 *lat += info.second->latency();
216 route->link_list->push_back(info.first);
218 *lat += info.first->latency();
220 current_node = next_node;