+++ /dev/null
-/* Copyright (c) 2014-2015. The SimGrid Team.
- * All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-#include "src/surf/surf_routing_cluster_torus.hpp"
-#include "src/surf/xml/platf.hpp" // FIXME: move that back to the parsing area
-
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_route_cluster_torus, surf_route_cluster, "Torus Routing part of surf");
-
-
-inline unsigned int *rankId_to_coords(int rankId, xbt_dynar_t dimensions)
-{
-
- unsigned int i = 0, cur_dim_size = 1, dim_size_product = 1;
- unsigned int *coords = (unsigned int *) malloc(xbt_dynar_length(dimensions) * sizeof(unsigned int));
- for (i = 0; i < xbt_dynar_length(dimensions); i++) {
- cur_dim_size = xbt_dynar_get_as(dimensions, i, int);
- coords[i] = (rankId / dim_size_product) % cur_dim_size;
- dim_size_product *= cur_dim_size;
- }
-
- return coords;
-}
-
-
-namespace simgrid {
- namespace surf {
- AsClusterTorus::AsClusterTorus(const char*name)
- : AsCluster(name) {
- }
- AsClusterTorus::~AsClusterTorus() {
- xbt_dynar_free(&dimensions_);
- }
-
- void AsClusterTorus::create_links_for_node(sg_platf_cluster_cbarg_t cluster, int id, int rank, int position) {
- s_sg_platf_link_cbarg_t link = SG_PLATF_LINK_INITIALIZER;
- char *link_id;
- unsigned int j = 0;
- /**
- * Create all links that exist in the torus.
- * Each rank creates #dimensions-1 links
- */
- int neighbour_rank_id = 0; // The other node the link connects
- int current_dimension = 0, // which dimension are we currently in?
- // we need to iterate over all dimensions
- // and create all links there
- dim_product = 1; // Needed to calculate the next neighbour_id
- for (j = 0; j < xbt_dynar_length(dimensions_); j++) {
-
- memset(&link, 0, sizeof(link));
- current_dimension = xbt_dynar_get_as(dimensions_, j, int);
- neighbour_rank_id =
- (((int) rank / dim_product) % current_dimension ==
- current_dimension - 1) ? rank - (current_dimension - 1) * dim_product : rank + dim_product;
- //name of neighbor is not right for non contiguous cluster radicals (as id != rank in this case)
- link_id = bprintf("%s_link_from_%i_to_%i", cluster->id, id, neighbour_rank_id);
- link.id = link_id;
- link.bandwidth = cluster->bw;
- link.latency = cluster->lat;
- link.policy = cluster->sharing_policy;
- sg_platf_new_link(&link);
- s_surf_parsing_link_up_down_t info;
- if (link.policy == SURF_LINK_FULLDUPLEX) {
- char *tmp_link = bprintf("%s_UP", link_id);
- info.link_up = Link::byName(tmp_link);
- free(tmp_link);
- tmp_link = bprintf("%s_DOWN", link_id);
- info.link_down = Link::byName(tmp_link);
- free(tmp_link);
- } else {
- info.link_up = Link::byName(link_id);
- info.link_down = info.link_up;
- }
- /**
- * Add the link to its appropriate position;
- * note that position rankId*(xbt_dynar_length(dimensions)+has_loopack?+has_limiter?)
- * holds the link "rankId->rankId"
- */
- xbt_dynar_set(upDownLinks, position + j, &info);
- dim_product *= current_dimension;
- xbt_free(link_id);
- }
- rank++;
- }
-
- void AsClusterTorus::parse_specific_arguments(sg_platf_cluster_cbarg_t cluster) {
-
- unsigned int iter;
- char *groups;
- xbt_dynar_t dimensions = xbt_str_split(cluster->topo_parameters, ",");
-
- if (!xbt_dynar_is_empty(dimensions)) {
- dimensions_ = xbt_dynar_new(sizeof(int), NULL);
- /**
- * We are in a torus cluster
- * Parse attribute dimensions="dim1,dim2,dim3,...,dimN"
- * and safe it in a dynarray.
- * Additionally, we need to know how many ranks we have in total
- */
- xbt_dynar_foreach(dimensions, iter, groups) {
- int tmp = surf_parse_get_int(xbt_dynar_get_as(dimensions, iter, char *));
- xbt_dynar_set_as(dimensions_, iter, int, tmp);
- }
-
- nb_links_per_node_ = xbt_dynar_length(dimensions_);
-
- }
- xbt_dynar_free(&dimensions);
- }
-
- void AsClusterTorus::getRouteAndLatency(NetCard * src, NetCard * dst, sg_platf_route_cbarg_t route, double *lat) {
-
- XBT_VERB("torus_get_route_and_latency from '%s'[%d] to '%s'[%d]",
- src->name(), src->id(), dst->name(), dst->id());
-
- if (dst->isRouter() || src->isRouter())
- return;
-
- if ((src->id() == dst->id()) && has_loopback_) {
- s_surf_parsing_link_up_down_t info = xbt_dynar_get_as(upDownLinks, src->id() * nb_links_per_node_, s_surf_parsing_link_up_down_t);
-
- route->link_list->push_back(info.link_up);
- if (lat)
- *lat += info.link_up->getLatency();
- return;
- }
-
-
- /**
- * Dimension based routing routes through each dimension consecutively
- * TODO Change to dynamic assignment
- */
- unsigned int j, cur_dim, dim_product = 1;
- int current_node = src->id();
- int unsigned next_node = 0;
- /**
- * Arrays that hold the coordinates of the current node and
- * the target; comparing the values at the i-th position of
- * both arrays, we can easily assess whether we need to route
- * into this dimension or not.
- */
- unsigned int *myCoords, *targetCoords;
- myCoords = rankId_to_coords(src->id(), dimensions_);
- targetCoords = rankId_to_coords(dst->id(), dimensions_);
- /**
- * linkOffset describes the offset where the link
- * we want to use is stored
- * (+1 is added because each node has a link from itself to itself,
- * which can only be the case if src->m_id == dst->m_id -- see above
- * for this special case)
- */
- int nodeOffset = (xbt_dynar_length(dimensions_) + 1) * src->id();
-
- int linkOffset = nodeOffset;
- bool use_lnk_up = false; // Is this link of the form "cur -> next" or "next -> cur"?
- // false means: next -> cur
- while (current_node != dst->id()) {
- dim_product = 1; // First, we will route in x-dimension
- for (j = 0; j < xbt_dynar_length(dimensions_); j++) {
- cur_dim = xbt_dynar_get_as(dimensions_, j, int);
-
- // current_node/dim_product = position in current dimension
- if ((current_node / dim_product) % cur_dim != (dst->id() / dim_product) % cur_dim) {
-
- if ((targetCoords[j] > myCoords[j] && targetCoords[j] <= myCoords[j] + cur_dim / 2) // Is the target node on the right, without the wrap-around?
- || (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?
- if ((current_node / dim_product) % cur_dim == cur_dim - 1)
- next_node = (current_node + dim_product - dim_product * cur_dim);
- else
- next_node = (current_node + dim_product);
-
- // HERE: We use *CURRENT* node for calculation (as opposed to next_node)
- nodeOffset = current_node * (nb_links_per_node_);
- linkOffset = nodeOffset + has_loopback_ + has_limiter_ + j;
- use_lnk_up = true;
- assert(linkOffset >= 0);
- } else { // Route to the left
- if ((current_node / dim_product) % cur_dim == 0)
- next_node = (current_node - dim_product + dim_product * cur_dim);
- else
- next_node = (current_node - dim_product);
-
- // HERE: We use *next* node for calculation (as opposed to current_node!)
- nodeOffset = next_node * (nb_links_per_node_);
- linkOffset = nodeOffset + j + has_loopback_ + has_limiter_;
- use_lnk_up = false;
-
- assert(linkOffset >= 0);
- }
- XBT_DEBUG("torus_get_route_and_latency - current_node: %i, next_node: %u, linkOffset is %i",
- current_node, next_node, linkOffset);
-
- break;
- }
-
- dim_product *= cur_dim;
- }
-
- s_surf_parsing_link_up_down_t info;
-
- if (has_limiter_) { // limiter for sender
- info = xbt_dynar_get_as(upDownLinks, nodeOffset + has_loopback_, s_surf_parsing_link_up_down_t);
- route->link_list->push_back(info.link_up);
- }
-
- info = xbt_dynar_get_as(upDownLinks, linkOffset, s_surf_parsing_link_up_down_t);
-
- if (use_lnk_up == false) {
- route->link_list->push_back(info.link_down);
- if (lat)
- *lat += info.link_down->getLatency();
- } else {
- route->link_list->push_back(info.link_up);
- if (lat)
- *lat += info.link_up->getLatency();
- }
- current_node = next_node;
- next_node = 0;
- }
- free(myCoords);
- free(targetCoords);
-
- return;
- }
-
- }
-}
