src/simdag/sd_workstation.c

   1 /* Copyright (c) 2007-2009 Da SimGrid Team.  All rights reserved.           */
   2
   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. */
   5
   6 #include "private.h"
   7 #include "simdag/simdag.h"
   8 #include "xbt/dict.h"
   9 #include "xbt/sysdep.h"
  10 #include "surf/surf.h"
  11
  12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_workstation, sd,
  13                                 "Logging specific to SimDag (workstation)");
  14
  15 /* Creates a workstation and registers it in SD.
  16  */
  17 SD_workstation_t __SD_workstation_create(void *surf_workstation, void *data)
  18 {
  19
  20   SD_workstation_t workstation;
  21   const char *name;
  22   SD_CHECK_INIT_DONE();
  23   xbt_assert0(surf_workstation != NULL, "surf_workstation is NULL !");
  24
  25   workstation = xbt_new(s_SD_workstation_t, 1);
  26   workstation->surf_workstation = surf_workstation;
  27   workstation->data = data;     /* user data */
  28   workstation->access_mode = SD_WORKSTATION_SHARED_ACCESS;      /* default mode is shared */
  29   workstation->task_fifo = NULL;
  30   workstation->current_task = NULL;
  31
  32   name = SD_workstation_get_name(workstation);
  33   xbt_dict_set(sd_global->workstations, name, workstation, __SD_workstation_destroy);   /* add the workstation to the dictionary */
  34   sd_global->workstation_count++;
  35
  36   return workstation;
  37 }
  38
  39 /**
  40  * \brief Returns a workstation given its name
  41  *
  42  * If there is no such workstation, the function returns \c NULL.
  43  *
  44  * \param name workstation name
  45  * \return the workstation, or \c NULL if there is no such workstation
  46  */
  47 SD_workstation_t SD_workstation_get_by_name(const char *name)
  48 {
  49   SD_CHECK_INIT_DONE();
  50
  51   xbt_assert0(name != NULL, "Invalid parameter");
  52
  53   return xbt_dict_get_or_null(sd_global->workstations, name);
  54 }
  55
  56 /**
  57  * \brief Returns the workstation list
  58  *
  59  * Use SD_workstation_get_number() to know the array size.
  60  *
  61  * \return an array of \ref SD_workstation_t containing all workstations
  62  * \see SD_workstation_get_number()
  63  */
  64 const SD_workstation_t *SD_workstation_get_list(void)
  65 {
  66
  67   xbt_dict_cursor_t cursor;
  68   char *key;
  69   void *data;
  70   int i;
  71
  72   SD_CHECK_INIT_DONE();
  73   xbt_assert0(SD_workstation_get_number() > 0, "There is no workstation!");
  74
  75
  76
  77   if (sd_global->workstation_list == NULL) {    /* this is the first time the function is called */
  78     sd_global->workstation_list =
  79       xbt_new(SD_workstation_t, sd_global->workstation_count);
  80
  81     i = 0;
  82     xbt_dict_foreach(sd_global->workstations, cursor, key, data) {
  83       sd_global->workstation_list[i++] = (SD_workstation_t) data;
  84     }
  85   }
  86   return sd_global->workstation_list;
  87 }
  88
  89 /**
  90  * \brief Returns the number of workstations
  91  *
  92  * \return the number of existing workstations
  93  * \see SD_workstation_get_list()
  94  */
  95 int SD_workstation_get_number(void)
  96 {
  97   SD_CHECK_INIT_DONE();
  98   return sd_global->workstation_count;
  99 }
 100
 101 /**
 102  * \brief Returns the user data of a workstation
 103  *
 104  * \param workstation a workstation
 105  * \return the user data associated with this workstation (can be \c NULL)
 106  * \see SD_workstation_set_data()
 107  */
 108 void *SD_workstation_get_data(SD_workstation_t workstation)
 109 {
 110   SD_CHECK_INIT_DONE();
 111   xbt_assert0(workstation != NULL, "Invalid parameter");
 112   return workstation->data;
 113 }
 114
 115 /**
 116  * \brief Sets the user data of a workstation
 117  *
 118  * The new data can be \c NULL. The old data should have been freed first
 119  * if it was not \c NULL.
 120  *
 121  * \param workstation a workstation
 122  * \param data the new data you want to associate with this workstation
 123  * \see SD_workstation_get_data()
 124  */
 125 void SD_workstation_set_data(SD_workstation_t workstation, void *data)
 126 {
 127   SD_CHECK_INIT_DONE();
 128   xbt_assert0(workstation != NULL, "Invalid parameter");
 129   workstation->data = data;
 130 }
 131
 132 /**
 133  * \brief Returns the name of a workstation
 134  *
 135  * \param workstation a workstation
 136  * \return the name of this workstation (cannot be \c NULL)
 137  */
 138 const char *SD_workstation_get_name(SD_workstation_t workstation)
 139 {
 140   SD_CHECK_INIT_DONE();
 141   xbt_assert0(workstation != NULL, "Invalid parameter");
 142   return surf_resource_name(workstation->surf_workstation);
 143 }
 144
 145 /**
 146  * \brief Returns the value of a given workstation property
 147  *
 148  * \param ws a workstation
 149  * \param name a property name
 150  * \return value of a property (or NULL if property not set)
 151  */
 152 const char *SD_workstation_get_property_value(SD_workstation_t ws,
 153                                               const char *name)
 154 {
 155   return xbt_dict_get_or_null(SD_workstation_get_properties(ws), name);
 156 }
 157
 158
 159 /**
 160  * \brief Returns a #xbt_dict_t consisting of the list of properties assigned to this workstation
 161  *
 162  * \param workstation a workstation
 163  * \return the dictionary containing the properties associated with the workstation
 164  */
 165 xbt_dict_t SD_workstation_get_properties(SD_workstation_t workstation)
 166 {
 167   SD_CHECK_INIT_DONE();
 168   xbt_assert0((workstation != NULL), "Invalid parameters");
 169
 170   return surf_workstation_model->extension.workstation.get_properties(workstation->surf_workstation);
 171
 172 }
 173
 174
 175 /**
 176  * \brief Returns the route between two workstations
 177  *
 178  * Use SD_route_get_size() to know the array size.
 179  *
 180  * \param src a workstation
 181  * \param dst another workstation
 182  * \return a new array of \ref SD_link_t representating the route between these two workstations
 183  * \see SD_route_get_size(), SD_link_t
 184  */
 185 const SD_link_t *SD_route_get_list(SD_workstation_t src, SD_workstation_t dst)
 186 {
 187   void *surf_src;
 188   void *surf_dst;
 189   xbt_dynar_t surf_route;
 190   const char *link_name;
 191   void *surf_link;
 192   unsigned int cpt;
 193
 194   SD_CHECK_INIT_DONE();
 195
 196   if (sd_global->recyclable_route == NULL) {
 197     /* first run */
 198     sd_global->recyclable_route = xbt_new(SD_link_t, SD_link_get_number());
 199   }
 200
 201   surf_src = src->surf_workstation;
 202   surf_dst = dst->surf_workstation;
 203
 204   surf_route =
 205     surf_workstation_model->extension.workstation.get_route(surf_src,
 206                                                             surf_dst);
 207
 208   xbt_dynar_foreach(surf_route, cpt, surf_link) {
 209     link_name = surf_resource_name(surf_link);
 210     sd_global->recyclable_route[cpt] =
 211       xbt_dict_get(sd_global->links, link_name);
 212   }
 213
 214   return sd_global->recyclable_route;
 215 }
 216
 217 /**
 218  * \brief Returns the number of links on the route between two workstations
 219  *
 220  * \param src a workstation
 221  * \param dst another workstation
 222  * \return the number of links on the route between these two workstations
 223  * \see SD_route_get_list()
 224  */
 225 int SD_route_get_size(SD_workstation_t src, SD_workstation_t dst)
 226 {
 227   SD_CHECK_INIT_DONE();
 228   return xbt_dynar_length(surf_workstation_model->extension.workstation.get_route(
 229         src->surf_workstation,dst->surf_workstation));
 230 }
 231
 232 /**
 233  * \brief Returns the total power of a workstation
 234  *
 235  * \param workstation a workstation
 236  * \return the total power of this workstation
 237  * \see SD_workstation_get_available_power()
 238  */
 239 double SD_workstation_get_power(SD_workstation_t workstation)
 240 {
 241   SD_CHECK_INIT_DONE();
 242   xbt_assert0(workstation != NULL, "Invalid parameter");
 243   return surf_workstation_model->extension.workstation.
 244     get_speed(workstation->surf_workstation, 1.0);
 245 }
 246
 247 /**
 248  * \brief Returns the proportion of available power in a workstation
 249  *
 250  * \param workstation a workstation
 251  * \return the proportion of power currently available in this workstation (normally a number between 0 and 1)
 252  * \see SD_workstation_get_power()
 253  */
 254 double SD_workstation_get_available_power(SD_workstation_t workstation)
 255 {
 256   SD_CHECK_INIT_DONE();
 257   xbt_assert0(workstation != NULL, "Invalid parameter");
 258   return surf_workstation_model->extension.
 259     workstation.get_available_speed(workstation->surf_workstation);
 260 }
 261
 262 /**
 263  * \brief Returns an approximative estimated time for the given computation amount on a workstation
 264  *
 265  * \param workstation a workstation
 266  * \param computation_amount the computation amount you want to evaluate (in flops)
 267  * \return an approximative astimated computation time for the given computation amount on this workstation (in seconds)
 268  */
 269 double SD_workstation_get_computation_time(SD_workstation_t workstation,
 270                                            double computation_amount)
 271 {
 272   SD_CHECK_INIT_DONE();
 273   xbt_assert0(workstation != NULL, "Invalid parameter");
 274   xbt_assert0(computation_amount >= 0,
 275               "computation_amount must be greater than or equal to zero");
 276   return computation_amount / SD_workstation_get_power(workstation);
 277 }
 278
 279 /**
 280  * \brief Returns the latency of the route between two workstations, i.e. the sum of all link latencies
 281  * between the workstations.
 282  *
 283  * \param src the first workstation
 284  * \param dst the second workstation
 285  * \return the latency of the route between the two workstations (in seconds)
 286  * \see SD_route_get_current_bandwidth()
 287  */
 288 double SD_route_get_current_latency(SD_workstation_t src,
 289                                     SD_workstation_t dst)
 290 {
 291
 292   const SD_link_t *links;
 293   int nb_links;
 294   double latency;
 295   int i;
 296
 297   SD_CHECK_INIT_DONE();
 298   xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
 299   links = SD_route_get_list(src, dst);
 300   nb_links = SD_route_get_size(src, dst);
 301   latency = 0.0;
 302
 303   for (i = 0; i < nb_links; i++) {
 304     latency += SD_link_get_current_latency(links[i]);
 305   }
 306
 307   return latency;
 308 }
 309
 310 /**
 311  * \brief Returns the bandwidth of the route between two workstations, i.e. the minimum link bandwidth of all
 312  * between the workstations.
 313  *
 314  * \param src the first workstation
 315  * \param dst the second workstation
 316  * \return the bandwidth of the route between the two workstations (in bytes/second)
 317  * \see SD_route_get_current_latency()
 318  */
 319 double SD_route_get_current_bandwidth(SD_workstation_t src,
 320                                       SD_workstation_t dst)
 321 {
 322
 323   const SD_link_t *links;
 324   int nb_links;
 325   double bandwidth;
 326   double min_bandwidth;
 327   int i;
 328
 329   SD_CHECK_INIT_DONE();
 330   xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
 331
 332   links = SD_route_get_list(src, dst);
 333   nb_links = SD_route_get_size(src, dst);
 334   bandwidth = min_bandwidth = -1.0;
 335
 336
 337   for (i = 0; i < nb_links; i++) {
 338     bandwidth = SD_link_get_current_bandwidth(links[i]);
 339     if (bandwidth < min_bandwidth || min_bandwidth == -1.0)
 340       min_bandwidth = bandwidth;
 341   }
 342
 343   return min_bandwidth;
 344 }
 345
 346 /**
 347  * \brief Returns an approximative estimated time for the given
 348  * communication amount between two workstations
 349  *
 350  * \param src the first workstation
 351  * \param dst the second workstation
 352  * \param communication_amount the communication amount you want to evaluate (in bytes)
 353  * \return an approximative astimated computation time for the given communication amount
 354  * between the workstations (in seconds)
 355  */
 356 double SD_route_get_communication_time(SD_workstation_t src,
 357                                        SD_workstation_t dst,
 358                                        double communication_amount)
 359 {
 360
 361
 362   /* total time = latency + transmission time of the slowest link
 363      transmission time of a link = communication amount / link bandwidth */
 364
 365   const SD_link_t *links;
 366   int nb_links;
 367   double bandwidth, min_bandwidth;
 368   double latency;
 369   int i;
 370
 371   SD_CHECK_INIT_DONE();
 372   xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
 373   xbt_assert0(communication_amount >= 0,
 374               "communication_amount must be greater than or equal to zero");
 375
 376
 377
 378   if (communication_amount == 0.0)
 379     return 0.0;
 380
 381   links = SD_route_get_list(src, dst);
 382   nb_links = SD_route_get_size(src, dst);
 383   min_bandwidth = -1.0;
 384   latency = 0;
 385
 386   for (i = 0; i < nb_links; i++) {
 387     latency += SD_link_get_current_latency(links[i]);
 388     bandwidth = SD_link_get_current_bandwidth(links[i]);
 389     if (bandwidth < min_bandwidth || min_bandwidth == -1.0)
 390       min_bandwidth = bandwidth;
 391   }
 392
 393   return latency + (communication_amount / min_bandwidth);
 394 }
 395
 396 /**
 397  * \brief Returns the access mode of this workstation.
 398  *
 399  * \param workstation a workstation
 400  * \return the access mode for the tasks running on this workstation:
 401  * SD_WORKSTATION_SHARED_ACCESS or SD_WORKSTATION_SEQUENTIAL_ACCESS
 402  *
 403  * \see SD_workstation_set_access_mode(), e_SD_workstation_access_mode_t
 404  */
 405 e_SD_workstation_access_mode_t SD_workstation_get_access_mode(SD_workstation_t
 406                                                               workstation)
 407 {
 408   SD_CHECK_INIT_DONE();
 409   xbt_assert0(workstation != NULL, "Invalid parameter");
 410   return workstation->access_mode;
 411 }
 412
 413 /**
 414  * \brief Sets the access mode for the tasks that will be executed on a workstation
 415  *
 416  * By default, a workstation model is shared, i.e. several tasks
 417  * can be executed at the same time on a workstation. The CPU power of
 418  * the workstation is shared between the running tasks on the workstation.
 419  * In sequential mode, only one task can use the workstation, and the other
 420  * tasks wait in a FIFO.
 421  *
 422  * \param workstation a workstation
 423  * \param access_mode the access mode you want to set to this workstation:
 424  * SD_WORKSTATION_SHARED_ACCESS or SD_WORKSTATION_SEQUENTIAL_ACCESS
 425  *
 426  * \see SD_workstation_get_access_mode(), e_SD_workstation_access_mode_t
 427  */
 428 void SD_workstation_set_access_mode(SD_workstation_t workstation,
 429                                     e_SD_workstation_access_mode_t
 430                                     access_mode)
 431 {
 432   SD_CHECK_INIT_DONE();
 433   xbt_assert0(workstation != NULL, "Invalid parameter");
 434
 435   if (access_mode == workstation->access_mode) {
 436     return;                     // nothing is changed
 437   }
 438
 439   workstation->access_mode = access_mode;
 440
 441   if (access_mode == SD_WORKSTATION_SHARED_ACCESS) {
 442     xbt_fifo_free(workstation->task_fifo);
 443     workstation->task_fifo = NULL;
 444   } else {
 445     workstation->task_fifo = xbt_fifo_new();
 446   }
 447 }
 448
 449 /* Returns whether a task can start now on a workstation.
 450                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               *//*
 451                                                                                                                                                                                                                                                                                                                                                                                                    int __SD_workstation_can_start(SD_workstation_t workstation, SD_task_t task) {
 452                                                                                                                                                                                                                                                                                                                                                                                                    SD_CHECK_INIT_DONE();
 453                                                                                                                                                                                                                                                                                                                                                                                                    xbt_assert0(workstation != NULL && task != NULL, "Invalid parameter");
 454
 455                                                                                                                                                                                                                                                                                                                                                                                                    return !__SD_workstation_is_busy(workstation) &&
 456                                                                                                                                                                                                                                                                                                                                                                                                    (xbt_fifo_size(workstation->task_fifo) == 0) || xbt_fifo_get_first_item(workstation->task_fifo) == task);
 457                                                                                                                                                                                                                                                                                                                                                                                                    }
 458                                                                                                                                                                                                                                                                                                                                                                                                  */
 459
 460 /* Returns whether a workstation is busy. A workstation is busy is it is
 461  * in sequential mode and a task is running on it or the fifo is not empty.
 462  */
 463 int __SD_workstation_is_busy(SD_workstation_t workstation)
 464 {
 465   SD_CHECK_INIT_DONE();
 466   xbt_assert0(workstation != NULL, "Invalid parameter");
 467
 468   DEBUG4
 469     ("Workstation '%s' access mode: '%s', current task: %s, fifo size: %d",
 470      SD_workstation_get_name(workstation),
 471      (workstation->access_mode ==
 472       SD_WORKSTATION_SHARED_ACCESS) ? "SHARED" : "FIFO",
 473      (workstation->current_task ? SD_task_get_name(workstation->current_task)
 474       : "none"),
 475      (workstation->task_fifo ? xbt_fifo_size(workstation->task_fifo) : 0));
 476
 477   return workstation->access_mode == SD_WORKSTATION_SEQUENTIAL_ACCESS &&
 478     (workstation->current_task != NULL
 479      || xbt_fifo_size(workstation->task_fifo) > 0);
 480 }
 481
 482 /* Destroys a workstation.
 483  */
 484 void __SD_workstation_destroy(void *workstation)
 485 {
 486
 487   SD_workstation_t w;
 488
 489   SD_CHECK_INIT_DONE();
 490   xbt_assert0(workstation != NULL, "Invalid parameter");
 491   /* workstation->surf_workstation is freed by surf_exit and workstation->data is freed by the user */
 492
 493   w = (SD_workstation_t) workstation;
 494
 495   if (w->access_mode == SD_WORKSTATION_SEQUENTIAL_ACCESS) {
 496     xbt_fifo_free(w->task_fifo);
 497   }
 498   xbt_free(w);
 499 }