src/simdag/sd_workstation.c

   1 /* Copyright (c) 2006-2011. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include "private.h"
   8 #include "simdag/simdag.h"
   9 #include "xbt/dict.h"
  10 #include "xbt/sysdep.h"
  11 #include "surf/surf.h"
  12 #include "surf/surf_resource.h"
  13
  14
  15
  16 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_workstation, sd,
  17                                 "Logging specific to SimDag (workstation)");
  18
  19 /* Creates a workstation and registers it in SD.
  20  */
  21 SD_workstation_t __SD_workstation_create(void *surf_workstation,
  22                                          void *data)
  23 {
  24
  25   SD_workstation_t workstation;
  26   const char *name;
  27
  28   workstation = xbt_new(s_SD_workstation_t, 1);
  29   workstation->surf_workstation = surf_workstation;
  30   workstation->data = data;     /* user data */
  31   workstation->access_mode = SD_WORKSTATION_SHARED_ACCESS;      /* default mode is shared */
  32   workstation->task_fifo = NULL;
  33   workstation->current_task = NULL;
  34
  35   name = SD_workstation_get_name(workstation);
  36   xbt_lib_set(host_lib,name,SD_HOST_LEVEL,workstation);
  37   return workstation;
  38 }
  39
  40 /**
  41  * \brief Returns a workstation given its name
  42  *
  43  * If there is no such workstation, the function returns \c NULL.
  44  *
  45  * \param name workstation name
  46  * \return the workstation, or \c NULL if there is no such workstation
  47  */
  48 SD_workstation_t SD_workstation_get_by_name(const char *name)
  49 {
  50   return xbt_lib_get_or_null(host_lib, name, SD_HOST_LEVEL);
  51 }
  52
  53 /**
  54  * \brief Returns the workstation list
  55  *
  56  * Use SD_workstation_get_number() to know the array size.
  57  *
  58  * \return an array of \ref SD_workstation_t containing all workstations
  59  * \see SD_workstation_get_number()
  60  */
  61 const SD_workstation_t *SD_workstation_get_list(void)
  62 {
  63
  64   xbt_lib_cursor_t cursor;
  65   char *key;
  66   void **data;
  67   int i;
  68
  69   xbt_assert(SD_workstation_get_number() > 0, "There is no workstation!");
  70
  71   if (sd_global->workstation_list == NULL) {    /* this is the first time the function is called */
  72     sd_global->workstation_list =
  73       xbt_new(SD_workstation_t, xbt_lib_length(host_lib));
  74
  75     i = 0;
  76     xbt_lib_foreach(host_lib, cursor, key, data) {
  77       if(data[SD_HOST_LEVEL])
  78         sd_global->workstation_list[i++] = (SD_workstation_t) data[SD_HOST_LEVEL];
  79     }
  80   }
  81   return sd_global->workstation_list;
  82 }
  83
  84 /**
  85  * \brief Returns the number of workstations
  86  *
  87  * \return the number of existing workstations
  88  * \see SD_workstation_get_list()
  89  */
  90 int SD_workstation_get_number(void)
  91 {
  92   return xbt_lib_length(host_lib);
  93 }
  94
  95 /**
  96  * \brief Returns the user data of a workstation
  97  *
  98  * \param workstation a workstation
  99  * \return the user data associated with this workstation (can be \c NULL)
 100  * \see SD_workstation_set_data()
 101  */
 102 void *SD_workstation_get_data(SD_workstation_t workstation)
 103 {
 104   return workstation->data;
 105 }
 106
 107 /**
 108  * \brief Sets the user data of a workstation
 109  *
 110  * The new data can be \c NULL. The old data should have been freed first
 111  * if it was not \c NULL.
 112  *
 113  * \param workstation a workstation
 114  * \param data the new data you want to associate with this workstation
 115  * \see SD_workstation_get_data()
 116  */
 117 void SD_workstation_set_data(SD_workstation_t workstation, void *data)
 118 {
 119   workstation->data = data;
 120 }
 121
 122 /**
 123  * \brief Returns the name of a workstation
 124  *
 125  * \param workstation a workstation
 126  * \return the name of this workstation (cannot be \c NULL)
 127  */
 128 const char *SD_workstation_get_name(SD_workstation_t workstation)
 129 {
 130   return surf_resource_name(workstation->surf_workstation);
 131 }
 132
 133 /**
 134  * \brief Returns the value of a given workstation property
 135  *
 136  * \param ws a workstation
 137  * \param name a property name
 138  * \return value of a property (or NULL if property not set)
 139  */
 140 const char *SD_workstation_get_property_value(SD_workstation_t ws,
 141                                               const char *name)
 142 {
 143   return xbt_dict_get_or_null(SD_workstation_get_properties(ws), name);
 144 }
 145
 146
 147 /**
 148  * \brief Returns a #xbt_dict_t consisting of the list of properties assigned to this workstation
 149  *
 150  * \param workstation a workstation
 151  * \return the dictionary containing the properties associated with the workstation
 152  */
 153 xbt_dict_t SD_workstation_get_properties(SD_workstation_t workstation)
 154 {
 155   return surf_workstation_model->extension.
 156       workstation.get_properties(workstation->surf_workstation);
 157
 158 }
 159
 160 /** @brief Displays debugging informations about a workstation */
 161 void SD_workstation_dump(SD_workstation_t ws)
 162 {
 163   xbt_dict_t props;
 164   xbt_dict_cursor_t cursor=NULL;
 165   char *key,*data;
 166   SD_task_t task = NULL;
 167
 168   XBT_INFO("Displaying workstation %s", SD_workstation_get_name(ws));
 169   XBT_INFO("  - power: %.0f", SD_workstation_get_power(ws));
 170   XBT_INFO("  - available power: %.2f", SD_workstation_get_available_power(ws));
 171   switch (ws->access_mode){
 172   case SD_WORKSTATION_SHARED_ACCESS:
 173       XBT_INFO("  - access mode: Space shared");
 174       break;
 175   case SD_WORKSTATION_SEQUENTIAL_ACCESS:
 176       XBT_INFO("  - access mode: Exclusive");
 177     task = SD_workstation_get_current_task(ws);
 178     if(task)
 179       XBT_INFO("    current running task: %s",
 180                SD_task_get_name(task));
 181     else
 182       XBT_INFO("    no task running");
 183       break;
 184   default: break;
 185   }
 186   props = SD_workstation_get_properties(ws);
 187
 188   if (!xbt_dict_is_empty(props)){
 189     XBT_INFO("  - properties:");
 190
 191     xbt_dict_foreach(props,cursor,key,data) {
 192       XBT_INFO("    %s->%s",key,data);
 193     }
 194   }
 195 }
 196
 197 /**
 198  * \brief Returns the route between two workstations
 199  *
 200  * Use SD_route_get_size() to know the array size.
 201  *
 202  * \param src a workstation
 203  * \param dst another workstation
 204  * \return a new array of \ref SD_link_t representating the route between these two workstations
 205  * \see SD_route_get_size(), SD_link_t
 206  */
 207 const SD_link_t *SD_route_get_list(SD_workstation_t src,
 208                                    SD_workstation_t dst)
 209 {
 210   void *surf_src;
 211   void *surf_dst;
 212   xbt_dynar_t surf_route;
 213   const char *link_name;
 214   void *surf_link;
 215   unsigned int cpt;
 216
 217   if (sd_global->recyclable_route == NULL) {
 218     /* first run */
 219     sd_global->recyclable_route = xbt_new(SD_link_t, SD_link_get_number());
 220   }
 221
 222   surf_src = src->surf_workstation;
 223   surf_dst = dst->surf_workstation;
 224   surf_route =
 225       surf_workstation_model->extension.workstation.get_route(surf_src,
 226                                                               surf_dst);
 227
 228   xbt_dynar_foreach(surf_route, cpt, surf_link) {
 229     link_name = surf_resource_name(surf_link);
 230     sd_global->recyclable_route[cpt] =
 231         xbt_lib_get_or_null(link_lib, link_name, SD_LINK_LEVEL);
 232   }
 233   return sd_global->recyclable_route;
 234 }
 235
 236 /**
 237  * \brief Returns the number of links on the route between two workstations
 238  *
 239  * \param src a workstation
 240  * \param dst another workstation
 241  * \return the number of links on the route between these two workstations
 242  * \see SD_route_get_list()
 243  */
 244 int SD_route_get_size(SD_workstation_t src, SD_workstation_t dst)
 245 {
 246   return xbt_dynar_length(surf_workstation_model->extension.
 247                           workstation.get_route(src->surf_workstation,
 248                                                 dst->surf_workstation));
 249 }
 250
 251 /**
 252  * \brief Returns the total power of a workstation
 253  *
 254  * \param workstation a workstation
 255  * \return the total power of this workstation
 256  * \see SD_workstation_get_available_power()
 257  */
 258 double SD_workstation_get_power(SD_workstation_t workstation)
 259 {
 260   return surf_workstation_model->extension.workstation.
 261       get_speed(workstation->surf_workstation, 1.0);
 262 }
 263
 264 /**
 265  * \brief Returns the proportion of available power in a workstation
 266  *
 267  * \param workstation a workstation
 268  * \return the proportion of power currently available in this workstation (normally a number between 0 and 1)
 269  * \see SD_workstation_get_power()
 270  */
 271 double SD_workstation_get_available_power(SD_workstation_t workstation)
 272 {
 273   return surf_workstation_model->extension.
 274       workstation.get_available_speed(workstation->surf_workstation);
 275 }
 276
 277 /**
 278  * \brief Returns an approximative estimated time for the given computation amount on a workstation
 279  *
 280  * \param workstation a workstation
 281  * \param computation_amount the computation amount you want to evaluate (in flops)
 282  * \return an approximative astimated computation time for the given computation amount on this workstation (in seconds)
 283  */
 284 double SD_workstation_get_computation_time(SD_workstation_t workstation,
 285                                            double computation_amount)
 286 {
 287   xbt_assert(computation_amount >= 0,
 288               "computation_amount must be greater than or equal to zero");
 289   return computation_amount / SD_workstation_get_power(workstation);
 290 }
 291
 292 /**
 293  * \brief Returns the latency of the route between two workstations, i.e. the sum of all link latencies
 294  * between the workstations.
 295  *
 296  * \param src the first workstation
 297  * \param dst the second workstation
 298  * \return the latency of the route between the two workstations (in seconds)
 299  * \see SD_route_get_current_bandwidth()
 300  */
 301 double SD_route_get_current_latency(SD_workstation_t src,
 302                                     SD_workstation_t dst)
 303 {
 304
 305   const SD_link_t *links;
 306   int nb_links;
 307   double latency;
 308   int i;
 309
 310   links = SD_route_get_list(src, dst);
 311   nb_links = SD_route_get_size(src, dst);
 312   latency = 0.0;
 313
 314   for (i = 0; i < nb_links; i++) {
 315     latency += SD_link_get_current_latency(links[i]);
 316   }
 317
 318   return latency;
 319 }
 320
 321 /**
 322  * \brief Returns the bandwidth of the route between two workstations, i.e. the minimum link bandwidth of all
 323  * between the workstations.
 324  *
 325  * \param src the first workstation
 326  * \param dst the second workstation
 327  * \return the bandwidth of the route between the two workstations (in bytes/second)
 328  * \see SD_route_get_current_latency()
 329  */
 330 double SD_route_get_current_bandwidth(SD_workstation_t src,
 331                                       SD_workstation_t dst)
 332 {
 333
 334   const SD_link_t *links;
 335   int nb_links;
 336   double bandwidth;
 337   double min_bandwidth;
 338   int i;
 339
 340   links = SD_route_get_list(src, dst);
 341   nb_links = SD_route_get_size(src, dst);
 342   bandwidth = min_bandwidth = -1.0;
 343
 344
 345   for (i = 0; i < nb_links; i++) {
 346     bandwidth = SD_link_get_current_bandwidth(links[i]);
 347     if (bandwidth < min_bandwidth || min_bandwidth == -1.0)
 348       min_bandwidth = bandwidth;
 349   }
 350
 351   return min_bandwidth;
 352 }
 353
 354 /**
 355  * \brief Returns an approximative estimated time for the given
 356  * communication amount between two workstations
 357  *
 358  * \param src the first workstation
 359  * \param dst the second workstation
 360  * \param communication_amount the communication amount you want to evaluate (in bytes)
 361  * \return an approximative astimated computation time for the given communication amount
 362  * between the workstations (in seconds)
 363  */
 364 double SD_route_get_communication_time(SD_workstation_t src,
 365                                        SD_workstation_t dst,
 366                                        double communication_amount)
 367 {
 368
 369
 370   /* total time = latency + transmission time of the slowest link
 371      transmission time of a link = communication amount / link bandwidth */
 372
 373   const SD_link_t *links;
 374   int nb_links;
 375   double bandwidth, min_bandwidth;
 376   double latency;
 377   int i;
 378
 379   xbt_assert(communication_amount >= 0,
 380               "communication_amount must be greater than or equal to zero");
 381
 382
 383
 384   if (communication_amount == 0.0)
 385     return 0.0;
 386
 387   links = SD_route_get_list(src, dst);
 388   nb_links = SD_route_get_size(src, dst);
 389   min_bandwidth = -1.0;
 390   latency = 0;
 391
 392   for (i = 0; i < nb_links; i++) {
 393     latency += SD_link_get_current_latency(links[i]);
 394     bandwidth = SD_link_get_current_bandwidth(links[i]);
 395     if (bandwidth < min_bandwidth || min_bandwidth == -1.0)
 396       min_bandwidth = bandwidth;
 397   }
 398
 399   return latency + (communication_amount / min_bandwidth);
 400 }
 401
 402 /**
 403  * \brief Returns the access mode of this workstation.
 404  *
 405  * \param workstation a workstation
 406  * \return the access mode for the tasks running on this workstation:
 407  * SD_WORKSTATION_SHARED_ACCESS or SD_WORKSTATION_SEQUENTIAL_ACCESS
 408  *
 409  * \see SD_workstation_set_access_mode(), e_SD_workstation_access_mode_t
 410  */
 411 e_SD_workstation_access_mode_t
 412 SD_workstation_get_access_mode(SD_workstation_t workstation)
 413 {
 414   return workstation->access_mode;
 415 }
 416
 417 /**
 418  * \brief Sets the access mode for the tasks that will be executed on a workstation
 419  *
 420  * By default, a workstation model is shared, i.e. several tasks
 421  * can be executed at the same time on a workstation. The CPU power of
 422  * the workstation is shared between the running tasks on the workstation.
 423  * In sequential mode, only one task can use the workstation, and the other
 424  * tasks wait in a FIFO.
 425  *
 426  * \param workstation a workstation
 427  * \param access_mode the access mode you want to set to this workstation:
 428  * SD_WORKSTATION_SHARED_ACCESS or SD_WORKSTATION_SEQUENTIAL_ACCESS
 429  *
 430  * \see SD_workstation_get_access_mode(), e_SD_workstation_access_mode_t
 431  */
 432 void SD_workstation_set_access_mode(SD_workstation_t workstation,
 433                                     e_SD_workstation_access_mode_t
 434                                     access_mode)
 435 {
 436   xbt_assert(access_mode != SD_WORKSTATION_SEQUENTIAL_ACCESS ||
 437              access_mode != SD_WORKSTATION_SHARED_ACCESS,
 438              "Trying to set an invalid access mode");
 439
 440   if (access_mode == workstation->access_mode) {
 441     return;                     // nothing is changed
 442   }
 443
 444   workstation->access_mode = access_mode;
 445
 446   if (access_mode == SD_WORKSTATION_SHARED_ACCESS) {
 447     xbt_fifo_free(workstation->task_fifo);
 448     workstation->task_fifo = NULL;
 449   } else {
 450     workstation->task_fifo = xbt_fifo_new();
 451   }
 452 }
 453
 454 /* Returns whether a task can start now on a workstation*/
 455 /*
 456   int __SD_workstation_can_start(SD_workstation_t workstation, SD_task_t task) {
 457   SD_CHECK_INIT_DONE();
 458   xbt_assert(workstation != NULL && task != NULL, "Invalid parameter");
 459
 460   return !__SD_workstation_is_busy(workstation) &&
 461   (xbt_fifo_size(workstation->task_fifo) == 0) || xbt_fifo_get_first_item(workstation->task_fifo) == task);
 462   }
 463 */
 464
 465 /* Returns whether a workstation is busy. A workstation is busy is it is
 466  * in sequential mode and a task is running on it or the fifo is not empty.
 467  */
 468 int __SD_workstation_is_busy(SD_workstation_t workstation)
 469 {
 470   XBT_DEBUG
 471       ("Workstation '%s' access mode: '%s', current task: %s, fifo size: %d",
 472        SD_workstation_get_name(workstation),
 473        (workstation->access_mode ==
 474         SD_WORKSTATION_SHARED_ACCESS) ? "SHARED" : "FIFO",
 475        (workstation->current_task ?
 476         SD_task_get_name(workstation->current_task)
 477         : "none"),
 478        (workstation->task_fifo ? xbt_fifo_size(workstation->task_fifo) :
 479         0));
 480
 481   return workstation->access_mode == SD_WORKSTATION_SEQUENTIAL_ACCESS &&
 482       (workstation->current_task != NULL
 483        || xbt_fifo_size(workstation->task_fifo) > 0);
 484 }
 485
 486 /* Destroys a workstation.
 487  */
 488 void __SD_workstation_destroy(void *workstation)
 489 {
 490
 491   SD_workstation_t w;
 492
 493   /* workstation->surf_workstation is freed by surf_exit and workstation->data is freed by the user */
 494
 495   w = (SD_workstation_t) workstation;
 496
 497   if (w->access_mode == SD_WORKSTATION_SEQUENTIAL_ACCESS) {
 498     xbt_fifo_free(w->task_fifo);
 499   }
 500   xbt_free(w);
 501 }
 502
 503 /**
 504  * \brief Returns the kind of the task currently running on a workstation
 505  * Only call this with sequential access mode set
 506  * \param workstation a workstation */
 507 SD_task_t SD_workstation_get_current_task(SD_workstation_t workstation)
 508 {
 509   xbt_assert(workstation->access_mode == SD_WORKSTATION_SEQUENTIAL_ACCESS,
 510               "Access mode must be set to SD_WORKSTATION_SEQUENTIAL_ACCESS"
 511               " to use this function");
 512
 513   return (workstation->current_task);
 514 }