src/simdag/sd_workstation.cpp

   1 /* Copyright (c) 2006-2016. 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 "src/surf/host_interface.hpp"
   8 #include "src/simdag/simdag_private.h"
   9 #include "simgrid/simdag.h"
  10 #include <simgrid/s4u/host.hpp>
  11 #include "xbt/dict.h"
  12 #include "xbt/lib.h"
  13 #include "xbt/sysdep.h"
  14 #include "surf/surf.h"
  15 #include "simgrid/msg.h" //FIXME: why?
  16
  17 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_workstation, sd,
  18                                 "Logging specific to SimDag (workstation)");
  19
  20 /* Creates a workstation and registers it in SD.
  21  */
  22 SD_workstation_t __SD_workstation_create(const char *name)
  23 {
  24
  25   SD_workstation_priv_t workstation;
  26
  27   workstation = xbt_new(s_SD_workstation_priv_t, 1);
  28   workstation->access_mode = SD_WORKSTATION_SHARED_ACCESS;      /* default mode is shared */
  29   workstation->task_fifo = NULL;
  30   workstation->current_task = NULL;
  31
  32   sg_host_t sg_host = sg_host_by_name(name);
  33   sg_host_sd_set(sg_host,workstation);
  34   return sg_host;
  35 }
  36
  37 /* Creates a storage and registers it in SD.
  38  */
  39 SD_storage_t __SD_storage_create(void *surf_storage, void *data)
  40 {
  41
  42   SD_storage_priv_t storage;
  43   const char *name;
  44
  45   storage = xbt_new(s_SD_storage_priv_t, 1);
  46   storage->data = data;     /* user data */
  47   name = surf_resource_name((surf_cpp_resource_t)surf_storage);
  48   storage->host = (const char*)surf_storage_get_host( (surf_resource_t )surf_storage_resource_by_name(name));
  49   xbt_lib_set(storage_lib,name, SD_STORAGE_LEVEL, storage);
  50   return xbt_lib_get_elm_or_null(storage_lib, name);
  51 }
  52
  53 /* Destroys a storage.
  54  */
  55 void __SD_storage_destroy(void *storage)
  56 {
  57   SD_storage_priv_t s;
  58
  59   s = (SD_storage_priv_t) storage;
  60   xbt_free(s);
  61 }
  62
  63 /**
  64  * \brief Returns a workstation given its name
  65  *
  66  * If there is no such workstation, the function returns \c NULL.
  67  *
  68  * \param name workstation name
  69  * \return the workstation, or \c NULL if there is no such workstation
  70  */
  71 SD_workstation_t SD_workstation_get_by_name(const char *name)
  72 {
  73   return sg_host_by_name(name);
  74 }
  75
  76 /**
  77  * \brief Returns the workstation list
  78  *
  79  * Use SD_workstation_get_number() to know the array size.
  80  *
  81  * \return an array of \ref SD_workstation_t containing all workstations
  82  * \remark The workstation order in the returned array is generally different from the workstation creation/declaration order in the XML platform (we use a hash table internally).
  83  * \see SD_workstation_get_number()
  84  */
  85 const SD_workstation_t *SD_workstation_get_list(void) {
  86   xbt_assert(SD_workstation_get_number() > 0, "There is no workstation!");
  87
  88   if (sd_global->workstation_list == NULL)     /* this is the first time the function is called */
  89     sd_global->workstation_list = (SD_workstation_t*)xbt_dynar_to_array(sg_hosts_as_dynar());
  90
  91   return sd_global->workstation_list;
  92 }
  93
  94 /**
  95  * \brief Returns the number of workstations
  96  *
  97  * \return the number of existing workstations
  98  * \see SD_workstation_get_list()
  99  */
 100 int SD_workstation_get_number(void)
 101 {
 102   return sg_host_count();
 103 }
 104
 105 /**
 106  * \brief Returns the user data of a workstation
 107  *
 108  * \param workstation a workstation
 109  * \return the user data associated with this workstation (can be \c NULL)
 110  * \see SD_workstation_set_data()
 111  */
 112 void *SD_workstation_get_data(SD_workstation_t workstation)
 113 {
 114   return sg_host_user(workstation);
 115 }
 116
 117 /**
 118  * \brief Sets the user data of a workstation
 119  *
 120  * The new data can be \c NULL. The old data should have been freed first
 121  * if it was not \c NULL.
 122  *
 123  * \param workstation a workstation
 124  * \param data the new data you want to associate with this workstation
 125  * \see SD_workstation_get_data()
 126  */
 127 void SD_workstation_set_data(SD_workstation_t workstation, void *data)
 128 {
 129         sg_host_user_set(workstation, 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   return sg_host_get_name(workstation);
 141 }
 142
 143 /**
 144  * \brief Returns the value of a given workstation property
 145  *
 146  * \param ws a workstation
 147  * \param name a property name
 148  * \return value of a property (or NULL if property not set)
 149  */
 150 const char *SD_workstation_get_property_value(SD_workstation_t ws,
 151                                               const char *name)
 152 {
 153   return (const char*) xbt_dict_get_or_null(SD_workstation_get_properties(ws), name);
 154 }
 155
 156
 157 /**
 158  * \brief Returns a #xbt_dict_t consisting of the list of properties assigned to this workstation
 159  *
 160  * \param workstation a workstation
 161  * \return the dictionary containing the properties associated with the workstation
 162  */
 163 xbt_dict_t SD_workstation_get_properties(SD_workstation_t workstation)
 164 {
 165   return sg_host_get_properties(workstation);
 166 }
 167
 168
 169 /** @brief Displays debugging informations about a workstation */
 170 void SD_workstation_dump(SD_workstation_t ws)
 171 {
 172   xbt_dict_t props;
 173   xbt_dict_cursor_t cursor=NULL;
 174   char *key,*data;
 175   SD_task_t task = NULL;
 176
 177   XBT_INFO("Displaying workstation %s", SD_workstation_get_name(ws));
 178   XBT_INFO("  - power: %.0f", SD_workstation_get_power(ws));
 179   XBT_INFO("  - available power: %.2f", SD_workstation_get_available_power(ws));
 180   switch (sg_host_sd(ws)->access_mode){
 181   case SD_WORKSTATION_SHARED_ACCESS:
 182       XBT_INFO("  - access mode: Space shared");
 183       break;
 184   case SD_WORKSTATION_SEQUENTIAL_ACCESS:
 185       XBT_INFO("  - access mode: Exclusive");
 186     task = SD_workstation_get_current_task(ws);
 187     if(task)
 188       XBT_INFO("    current running task: %s",
 189                SD_task_get_name(task));
 190     else
 191       XBT_INFO("    no task running");
 192       break;
 193   default: break;
 194   }
 195   props = SD_workstation_get_properties(ws);
 196
 197   if (!xbt_dict_is_empty(props)){
 198     XBT_INFO("  - properties:");
 199
 200     xbt_dict_foreach(props,cursor,key,data) {
 201       XBT_INFO("    %s->%s",key,data);
 202     }
 203   }
 204 }
 205
 206 /**
 207  * \brief Returns the route between two workstations
 208  *
 209  * Use SD_route_get_size() to know the array size.
 210  *
 211  * \param src a workstation
 212  * \param dst another workstation
 213  * \return a new array of \ref SD_link_t representing the route between these two workstations
 214  * \see SD_route_get_size(), SD_link_t
 215  */
 216 const SD_link_t *SD_route_get_list(SD_workstation_t src,
 217                                    SD_workstation_t dst)
 218 {
 219   xbt_dynar_t surf_route;
 220   void *surf_link;
 221   unsigned int cpt;
 222
 223   if (sd_global->recyclable_route == NULL) {
 224     /* first run */
 225     sd_global->recyclable_route = xbt_new(SD_link_t, SD_link_get_number());
 226   }
 227
 228   surf_route = surf_host_model_get_route((surf_host_model_t)surf_host_model, src, dst);
 229
 230   xbt_dynar_foreach(surf_route, cpt, surf_link) {
 231     sd_global->recyclable_route[cpt] = (SD_link_t)surf_link;
 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_host_model_get_route(
 247                     (surf_host_model_t)surf_host_model, src, dst));
 248 }
 249
 250 /**
 251  * \brief Returns the total power of a workstation
 252  *
 253  * \param workstation a workstation
 254  * \return the total power of this workstation
 255  * \see SD_workstation_get_available_power()
 256  */
 257 double SD_workstation_get_power(SD_workstation_t workstation)
 258 {
 259   return workstation->speed();
 260 }
 261 /**
 262  * \brief Returns the amount of cores of a workstation
 263  *
 264  * \param workstation a workstation
 265  * \return the amount of cores of this workstation
 266  */
 267 int SD_workstation_get_cores(SD_workstation_t workstation) {
 268   return workstation->core_count();
 269 }
 270
 271 /**
 272  * \brief Returns the proportion of available power in a workstation
 273  *
 274  * \param workstation a workstation
 275  * \return the proportion of power currently available in this workstation (normally a number between 0 and 1)
 276  * \see SD_workstation_get_power()
 277  */
 278 double SD_workstation_get_available_power(SD_workstation_t workstation)
 279 {
 280   return surf_host_get_available_speed(workstation);
 281 }
 282
 283 /**
 284  * \brief Returns an approximative estimated time for the given computation amount on a workstation
 285  *
 286  * \param workstation a workstation
 287  * \param flops_amount the computation amount you want to evaluate (in flops)
 288  * \return an approximative estimated computation time for the given computation amount on this workstation (in seconds)
 289  */
 290 double SD_workstation_get_computation_time(SD_workstation_t workstation,
 291                                            double flops_amount)
 292 {
 293   xbt_assert(flops_amount >= 0,
 294               "flops_amount must be greater than or equal to zero");
 295   return flops_amount / SD_workstation_get_power(workstation);
 296 }
 297
 298 /**
 299  * \brief Returns the latency of the route between two workstations, i.e. the sum of all link latencies
 300  * between the workstations.
 301  *
 302  * \param src the first workstation
 303  * \param dst the second workstation
 304  * \return the latency of the route between the two workstations (in seconds)
 305  * \see SD_route_get_current_bandwidth()
 306  */
 307 double SD_route_get_current_latency(SD_workstation_t src,
 308                                     SD_workstation_t dst)
 309 {
 310
 311   const SD_link_t *links;
 312   int nb_links;
 313   double latency;
 314   int i;
 315
 316   links = SD_route_get_list(src, dst);
 317   nb_links = SD_route_get_size(src, dst);
 318   latency = 0.0;
 319
 320   for (i = 0; i < nb_links; i++) {
 321     latency += SD_link_get_current_latency(links[i]);
 322   }
 323
 324   return latency;
 325 }
 326
 327 /**
 328  * \brief Returns the bandwidth of the route between two workstations, i.e. the minimum link bandwidth of all
 329  * between the workstations.
 330  *
 331  * \param src the first workstation
 332  * \param dst the second workstation
 333  * \return the bandwidth of the route between the two workstations (in bytes/second)
 334  * \see SD_route_get_current_latency()
 335  */
 336 double SD_route_get_current_bandwidth(SD_workstation_t src,
 337                                       SD_workstation_t dst)
 338 {
 339
 340   const SD_link_t *links;
 341   int nb_links;
 342   double bandwidth;
 343   double min_bandwidth;
 344   int i;
 345
 346   links = SD_route_get_list(src, dst);
 347   nb_links = SD_route_get_size(src, dst);
 348   min_bandwidth = -1.0;
 349
 350   for (i = 0; i < nb_links; i++) {
 351     bandwidth = SD_link_get_current_bandwidth(links[i]);
 352     if (bandwidth < min_bandwidth || min_bandwidth == -1.0)
 353       min_bandwidth = bandwidth;
 354   }
 355
 356   return min_bandwidth;
 357 }
 358
 359 /**
 360  * \brief Returns an approximative estimated time for the given
 361  * communication amount between two workstations
 362  *
 363  * \param src the first workstation
 364  * \param dst the second workstation
 365  * \param bytes_amount the communication amount you want to evaluate (in bytes)
 366  * \return an approximative estimated communication time for the given bytes amount
 367  * between the workstations (in seconds)
 368  */
 369 double SD_route_get_communication_time(SD_workstation_t src,
 370                                        SD_workstation_t dst,
 371                                        double bytes_amount)
 372 {
 373
 374
 375   /* total time = latency + transmission time of the slowest link
 376      transmission time of a link = communication amount / link bandwidth */
 377
 378   const SD_link_t *links;
 379   int nb_links;
 380   double bandwidth, min_bandwidth;
 381   double latency;
 382   int i;
 383
 384   xbt_assert(bytes_amount >= 0, "bytes_amount must be greater than or equal to zero");
 385
 386
 387   if (bytes_amount == 0.0)
 388     return 0.0;
 389
 390   links = SD_route_get_list(src, dst);
 391   nb_links = SD_route_get_size(src, dst);
 392   min_bandwidth = -1.0;
 393   latency = 0;
 394
 395   for (i = 0; i < nb_links; i++) {
 396     latency += SD_link_get_current_latency(links[i]);
 397     bandwidth = SD_link_get_current_bandwidth(links[i]);
 398     if (bandwidth < min_bandwidth || min_bandwidth == -1.0)
 399       min_bandwidth = bandwidth;
 400   }
 401
 402   return latency + (bytes_amount / min_bandwidth);
 403 }
 404
 405 /**
 406  * \brief Returns the access mode of this workstation.
 407  *
 408  * \param workstation a workstation
 409  * \return the access mode for the tasks running on this workstation:
 410  * SD_WORKSTATION_SHARED_ACCESS or SD_WORKSTATION_SEQUENTIAL_ACCESS
 411  *
 412  * \see SD_workstation_set_access_mode(), e_SD_workstation_access_mode_t
 413  */
 414 e_SD_workstation_access_mode_t
 415 SD_workstation_get_access_mode(SD_workstation_t workstation)
 416 {
 417   return sg_host_sd(workstation)->access_mode;
 418 }
 419
 420 /**
 421  * \brief Sets the access mode for the tasks that will be executed on a workstation
 422  *
 423  * By default, a workstation model is shared, i.e. several tasks
 424  * can be executed at the same time on a workstation. The CPU power of
 425  * the workstation is shared between the running tasks on the workstation.
 426  * In sequential mode, only one task can use the workstation, and the other
 427  * tasks wait in a FIFO.
 428  *
 429  * \param workstation a workstation
 430  * \param access_mode the access mode you want to set to this workstation:
 431  * SD_WORKSTATION_SHARED_ACCESS or SD_WORKSTATION_SEQUENTIAL_ACCESS
 432  *
 433  * \see SD_workstation_get_access_mode(), e_SD_workstation_access_mode_t
 434  */
 435 void SD_workstation_set_access_mode(SD_workstation_t workstation,
 436                                     e_SD_workstation_access_mode_t
 437                                     access_mode)
 438 {
 439   xbt_assert(access_mode != SD_WORKSTATION_SEQUENTIAL_ACCESS ||
 440              access_mode != SD_WORKSTATION_SHARED_ACCESS,
 441              "Trying to set an invalid access mode");
 442
 443   if (access_mode == sg_host_sd(workstation)->access_mode) {
 444     return;                     // nothing is changed
 445   }
 446
 447   sg_host_sd(workstation)->access_mode = access_mode;
 448
 449   if (access_mode == SD_WORKSTATION_SHARED_ACCESS) {
 450     xbt_fifo_free(sg_host_sd(workstation)->task_fifo);
 451     sg_host_sd(workstation)->task_fifo = NULL;
 452   } else {
 453           sg_host_sd(workstation)->task_fifo = xbt_fifo_new();
 454   }
 455 }
 456
 457 /**
 458  * \brief Return the list of mounted storages on a workstation.
 459  *
 460  * \param workstation a workstation
 461  * \return a dynar containing all mounted storages on the workstation
 462  */
 463 xbt_dict_t SD_workstation_get_mounted_storage_list(SD_workstation_t workstation){
 464   return workstation->extension<simgrid::surf::Host>()->getMountedStorageList();
 465 }
 466
 467 /**
 468  * \brief Return the list of mounted storages on a workstation.
 469  *
 470  * \param workstation a workstation
 471  * \return a dynar containing all mounted storages on the workstation
 472  */
 473 xbt_dynar_t SD_workstation_get_attached_storage_list(SD_workstation_t workstation){
 474   return surf_host_get_attached_storage_list(workstation);
 475 }
 476
 477 /**
 478  * \brief Returns the host name the storage is attached to
 479  *
 480  * This functions checks whether a storage is a valid pointer or not and return its name.
 481  */
 482 const char *SD_storage_get_host(msg_storage_t storage) {
 483   xbt_assert((storage != NULL), "Invalid parameters");
 484   SD_storage_priv_t priv = SD_storage_priv(storage);
 485   return priv->host;
 486 }
 487
 488 /* Returns whether a task can start now on a workstation*/
 489 /*
 490   int __SD_workstation_can_start(SD_workstation_t workstation, SD_task_t task) {
 491   SD_CHECK_INIT_DONE();
 492   xbt_assert(workstation != NULL && task != NULL, "Invalid parameter");
 493
 494   return !__SD_workstation_is_busy(workstation) &&
 495   (xbt_fifo_size(workstation->task_fifo) == 0) || xbt_fifo_get_first_item(workstation->task_fifo) == task);
 496   }
 497 */
 498
 499 /* Returns whether a workstation is busy. A workstation is busy is it is
 500  * in sequential mode and a task is running on it or the fifo is not empty.
 501  */
 502 int __SD_workstation_is_busy(SD_workstation_t workstation)
 503 {
 504   XBT_DEBUG
 505       ("Workstation '%s' access mode: '%s', current task: %s, fifo size: %d",
 506        SD_workstation_get_name(workstation),
 507        (sg_host_sd(workstation)->access_mode ==
 508         SD_WORKSTATION_SHARED_ACCESS) ? "SHARED" : "FIFO",
 509        (sg_host_sd(workstation)->current_task ?
 510         SD_task_get_name(sg_host_sd(workstation)->current_task)
 511         : "none"),
 512        (sg_host_sd(workstation)->task_fifo ? xbt_fifo_size(sg_host_sd(workstation)->task_fifo) :
 513         0));
 514
 515   return sg_host_sd(workstation)->access_mode == SD_WORKSTATION_SEQUENTIAL_ACCESS &&
 516       (sg_host_sd(workstation)->current_task != NULL
 517        || xbt_fifo_size(sg_host_sd(workstation)->task_fifo) > 0);
 518 }
 519
 520 /* Destroys a workstation.
 521  */
 522 void __SD_workstation_destroy(void *workstation)
 523 {
 524
 525   if (workstation==NULL)
 526           return;
 527   SD_workstation_priv_t w;
 528
 529   /* workstation->surf_workstation is freed by surf_exit and workstation->data is freed by the user */
 530
 531   w = (SD_workstation_priv_t) workstation;
 532
 533   if (w->access_mode == SD_WORKSTATION_SEQUENTIAL_ACCESS) {
 534     xbt_fifo_free(w->task_fifo);
 535   }
 536   xbt_free(w);
 537 }
 538
 539 /**
 540  * \brief Returns the kind of the task currently running on a workstation
 541  * Only call this with sequential access mode set
 542  * \param workstation a workstation */
 543 SD_task_t SD_workstation_get_current_task(SD_workstation_t workstation)
 544 {
 545   xbt_assert(sg_host_sd(workstation)->access_mode == SD_WORKSTATION_SEQUENTIAL_ACCESS,
 546               "Access mode must be set to SD_WORKSTATION_SEQUENTIAL_ACCESS"
 547               " to use this function");
 548
 549   return (sg_host_sd(workstation)->current_task);
 550 }
 551