}
/**
- * \brief Returns the workstations list
+ * \brief Returns the workstation list
*
* Use SD_workstation_get_number() to know the array size.
*
* \return an array of \ref SD_workstation_t containing all workstations
* \see SD_workstation_get_number()
*/
-SD_workstation_t* SD_workstation_get_list(void) {
+const SD_workstation_t* SD_workstation_get_list(void) {
SD_CHECK_INIT_DONE();
xbt_assert0(SD_workstation_get_number() > 0, "There is no workstation!");
- SD_workstation_t* array = xbt_new0(SD_workstation_t, sd_global->workstation_count);
-
xbt_dict_cursor_t cursor;
char *key;
void *data;
- int i=0;
+ int i;
- xbt_dict_foreach(sd_global->workstations, cursor, key, data) {
- array[i++] = (SD_workstation_t) data;
+ if (sd_global->workstation_list == NULL) { /* this is the first time the function is called */
+ sd_global->workstation_list = xbt_new0(SD_workstation_t, sd_global->workstation_count);
+
+ i = 0;
+ xbt_dict_foreach(sd_global->workstations, cursor, key, data) {
+ sd_global->workstation_list[i++] = (SD_workstation_t) data;
+ }
}
-
- return array;
+ return sd_global->workstation_list;
}
/**
/**
* \brief Returns the route between two workstations
*
- * Use SD_workstation_route_get_size() to know the array size.
+ * Use SD_route_get_size() to know the array size. Don't forget to free the array after use.
*
* \param src a workstation
* \param dst another workstation
* \return a new array of \ref SD_link_t representating the route between these two workstations
- * \see SD_workstation_route_get_size(), SD_link_t
+ * \see SD_route_get_size(), SD_link_t
*/
-SD_link_t* SD_workstation_route_get_list(SD_workstation_t src, SD_workstation_t dst) {
+SD_link_t* SD_route_get_list(SD_workstation_t src, SD_workstation_t dst) {
SD_CHECK_INIT_DONE();
void *surf_src = src->surf_workstation;
* \param src a workstation
* \param dst another workstation
* \return the number of links on the route between these two workstations
- * \see SD_workstation_route_get_list()
+ * \see SD_route_get_list()
*/
-int SD_workstation_route_get_size(SD_workstation_t src, SD_workstation_t dst) {
+int SD_route_get_size(SD_workstation_t src, SD_workstation_t dst) {
SD_CHECK_INIT_DONE();
return surf_workstation_resource->extension_public->
get_route_size(src->surf_workstation, dst->surf_workstation);
return surf_workstation_resource->extension_public->get_available_speed(workstation->surf_workstation);
}
+/**
+ * \brief Returns an approximative estimated time for the given computation amount on a workstation
+ *
+ * \param workstation a workstation
+ * \param computation_amount the computation amount you want to evaluate (in flops)
+ * \return an approximative astimated computation time for the given computation amount on this workstation (in seconds)
+ */
+double SD_workstation_get_computation_time(SD_workstation_t workstation, double computation_amount) {
+ SD_CHECK_INIT_DONE();
+ xbt_assert0(workstation != NULL, "Invalid parameter");
+ xbt_assert0(computation_amount >= 0, "computation_amount must be greater than or equal to zero");
+ return computation_amount / SD_workstation_get_power(workstation);
+}
+
+/**
+ * \brief Returns the latency of the route between two workstations, i.e. the sum of all link latencies
+ * between the workstations.
+ *
+ * \param src the first workstation
+ * \param dst the second workstation
+ * \return the latency of the route between the two workstations (in seconds)
+ * \see SD_route_get_current_bandwidth()
+ */
+double SD_route_get_current_latency(SD_workstation_t src, SD_workstation_t dst) {
+ SD_CHECK_INIT_DONE();
+ xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
+ SD_link_t *links = SD_route_get_list(src, dst);
+ int nb_links = SD_route_get_size(src, dst);
+ double latency = 0.0;
+ int i;
+
+ for (i = 0; i < nb_links; i++) {
+ latency += SD_link_get_current_latency(links[i]);
+ }
+
+ free(links);
+ return latency;
+}
+
+/**
+ * \brief Returns the bandwidth of the route between two workstations, i.e. the minimum link bandwidth of all
+ * between the workstations.
+ *
+ * \param src the first workstation
+ * \param dst the second workstation
+ * \return the bandwidth of the route between the two workstations (in bytes/second)
+ * \see SD_route_get_current_latency()
+ */
+double SD_route_get_current_bandwidth(SD_workstation_t src, SD_workstation_t dst) {
+ SD_CHECK_INIT_DONE();
+ xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
+ SD_link_t *links = SD_route_get_list(src, dst);
+ int nb_links = SD_route_get_size(src, dst);
+ double bandwidth, min_bandwidth = -1.0;
+ int i;
+
+ for (i = 0; i < nb_links; i++) {
+ bandwidth = SD_link_get_current_bandwidth(links[i]);
+ if (bandwidth < min_bandwidth || min_bandwidth == -1.0)
+ min_bandwidth = bandwidth;
+ }
+
+ free(links);
+ return min_bandwidth;
+}
+
+/**
+ * \brief Returns an approximative estimated time for the given
+ * communication amount between two workstations
+ *
+ * \param src the first workstation
+ * \param dst the second workstation
+ * \param communication_amount the communication amount you want to evaluate (in bytes)
+ * \return an approximative astimated computation time for the given communication amount
+ * between the workstations (in seconds)
+ */
+double SD_route_get_communication_time(SD_workstation_t src, SD_workstation_t dst,
+ double communication_amount) {
+ /* total time = latency + transmission time of the slowest link
+ transmission time of a link = communication amount / link bandwidth */
+ SD_CHECK_INIT_DONE();
+ xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
+ xbt_assert0(communication_amount >= 0, "communication_amount must be greater than or equal to zero");
+
+ SD_link_t *links;
+ int nb_links;
+ double bandwidth, min_bandwidth;
+ double latency;
+ int i;
+
+ if (communication_amount == 0.0)
+ return 0.0;
+
+ links = SD_route_get_list(src, dst);
+ nb_links = SD_route_get_size(src, dst);
+ min_bandwidth = -1.0;
+ latency = 0;
+
+ for (i = 0; i < nb_links; i++) {
+ latency += SD_link_get_current_latency(links[i]);
+ bandwidth = SD_link_get_current_bandwidth(links[i]);
+ if (bandwidth < min_bandwidth || min_bandwidth == -1.0)
+ min_bandwidth = bandwidth;
+ }
+ xbt_free(links);
+
+ return latency + (communication_amount / min_bandwidth);
+}
+
/* Destroys a workstation.
*/
void __SD_workstation_destroy(void *workstation) {
