1 /* Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010. The SimGrid Team.
2 * All rights reserved. */
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. */
11 #include "xbt/dynar.h"
14 #include "xbt/file_stat.h"
16 #include "xbt/config.h"
17 #include "surf/datatypes.h"
19 #include "surf/surf_routing.h"
20 #include "simgrid/platf_interface.h"
23 /* Actions and models are highly connected structures... */
26 SURF_NETWORK_ELEMENT_NULL = 0, /* NULL */
27 SURF_NETWORK_ELEMENT_HOST, /* host type */
28 SURF_NETWORK_ELEMENT_ROUTER, /* router type */
29 SURF_NETWORK_ELEMENT_AS /* AS type */
30 } e_surf_network_element_type_t;
32 XBT_PUBLIC(e_surf_network_element_type_t)
33 routing_get_network_element_type(const char* name);
35 /** @Brief Specify that we use that action */
36 XBT_PUBLIC(void) surf_action_ref(surf_action_t action);
37 /** @brief Creates a new action.
39 * @param size The size is the one of the subtype you want to create
40 * @param cost initial value
41 * @param model to which model we should attach this action
42 * @param failed whether we should start this action in failed mode
44 XBT_PUBLIC(void *) surf_action_new(size_t size, double cost,
45 surf_model_t model, int failed);
47 /** \brief Resource model description
49 typedef struct surf_model_description {
51 const char *description;
52 void_f_void_t model_init_preparse;
53 } s_surf_model_description_t, *surf_model_description_t;
55 XBT_PUBLIC(int) find_model_description(s_surf_model_description_t * table,
57 XBT_PUBLIC(void) model_help(const char *category,
58 s_surf_model_description_t * table);
60 enum heap_action_type{
67 /** \ingroup SURF_actions
68 * \brief Action structure
70 * Never create s_surf_action_t by yourself ! The actions are created
71 * on the fly when you call execute or communicate on a model.
73 * \see e_surf_action_state_t
75 typedef struct surf_action {
76 s_xbt_swag_hookup_t state_hookup;
78 double cost; /**< cost */
79 double priority; /**< priority (1.0 by default) */
80 double max_duration; /**< max_duration (may fluctuate until
81 the task is completed) */
82 double remains; /**< How much of that cost remains to
83 * be done in the currently running task */
84 #ifdef HAVE_LATENCY_BOUND_TRACKING
85 int latency_limited; /**< Set to 1 if is limited by latency, 0 otherwise */
88 double start; /**< start time */
89 double finish; /**< finish time : this is modified during the run
90 * and fluctuates until the task is completed */
91 void *data; /**< for your convenience */
93 surf_model_t model_type;
95 char *category; /**< tracing category for categorized resource utilization monitoring */
97 surf_file_t file; /**< surf_file_t for storage model */
98 s_file_stat_t stat; /**< surf_file_t for storage model */
101 typedef struct surf_action_lmm {
102 s_surf_action_t generic_action;
103 lmm_variable_t variable;
105 s_xbt_swag_hookup_t action_list_hookup;
108 enum heap_action_type hat;
109 } s_surf_action_lmm_t, *surf_action_lmm_t;
111 /** \ingroup SURF_actions
112 * \brief Action states
116 * \see surf_action_t, surf_action_state_t
119 SURF_ACTION_READY = 0, /**< Ready */
120 SURF_ACTION_RUNNING, /**< Running */
121 SURF_ACTION_FAILED, /**< Task Failure */
122 SURF_ACTION_DONE, /**< Completed */
123 SURF_ACTION_TO_FREE, /**< Action to free in next cleanup */
124 SURF_ACTION_NOT_IN_THE_SYSTEM
125 /**< Not in the system anymore. Why did you ask ? */
126 } e_surf_action_state_t;
128 /** \ingroup SURF_actions
129 * \brief Action state sets
131 * This structure contains some sets of actions.
132 * It provides a fast access to the actions in each state.
134 * \see surf_action_t, e_surf_action_state_t
136 typedef struct surf_action_state {
137 xbt_swag_t ready_action_set;
138 /**< Actions in state SURF_ACTION_READY */
139 xbt_swag_t running_action_set;
140 /**< Actions in state SURF_ACTION_RUNNING */
141 xbt_swag_t failed_action_set;
142 /**< Actions in state SURF_ACTION_FAILED */
143 xbt_swag_t done_action_set;
144 /**< Actions in state SURF_ACTION_DONE */
145 } s_surf_action_state_t, *surf_action_state_t;
147 /***************************/
148 /* Generic model object */
149 /***************************/
150 typedef struct s_routing_global s_routing_global_t, *routing_global_t;
151 XBT_PUBLIC_DATA(routing_global_t) global_routing;
154 /** \ingroup SURF_models
155 * \brief Private data available on all models
157 typedef struct surf_model_private *surf_model_private_t;
161 /** \ingroup SURF_models
162 * \brief CPU model extension public
164 * Public functions specific to the CPU model.
166 typedef struct surf_cpu_model_extension_public {
167 surf_action_t(*execute) (void *cpu, double size);
168 surf_action_t(*sleep) (void *cpu, double duration);
169 e_surf_resource_state_t(*get_state) (void *cpu);
170 double (*get_speed) (void *cpu, double load);
171 double (*get_available_speed) (void *cpu);
172 void* (*create_resource) (const char *name, double power_peak,
174 tmgr_trace_t power_trace,
176 e_surf_resource_state_t state_initial,
177 tmgr_trace_t state_trace,
178 xbt_dict_t cpu_properties);
179 void (*add_traces) (void);
180 } s_surf_model_extension_cpu_t;
184 /** \ingroup SURF_models
185 * \brief Network model extension public
187 * Public functions specific to the network model
189 typedef struct surf_network_model_extension_public {
190 surf_action_t (*communicate) (sg_routing_edge_t src,
191 sg_routing_edge_t dst,
192 double size, double rate);
193 xbt_dynar_t(*get_route) (void *src, void *dst); //FIXME: kill field? That is done by the routing nowadays
194 double (*get_link_bandwidth) (const void *link);
195 double (*get_link_latency) (const void *link);
196 int (*link_shared) (const void *link);
197 void (*add_traces) (void);
198 void* (*create_resource) (const char *name,
200 tmgr_trace_t bw_trace,
202 tmgr_trace_t lat_trace,
203 e_surf_resource_state_t
205 tmgr_trace_t state_trace,
206 e_surf_link_sharing_policy_t policy,
207 xbt_dict_t properties);
208 } s_surf_model_extension_network_t;
212 /** \ingroup SURF_models
213 * \brief Storage model extension public
215 * Public functions specific to the Storage model.
218 typedef struct surf_storage_model_extension_public {
219 surf_action_t(*open) (void *storage, const char* path, const char* mode);
220 surf_action_t(*close) (void *storage, surf_file_t fp);
221 surf_action_t(*read) (void *storage, void* ptr, size_t size, size_t nmemb, surf_file_t stream);
222 surf_action_t(*write) (void *storage, const void* ptr, size_t size, size_t nmemb, surf_file_t stream);
223 surf_action_t(*stat) (void *storage, surf_file_t stream);
224 void* (*create_resource) (const char* id, const char* model,const char* type_id);
225 } s_surf_model_extension_storage_t;
227 /** \ingroup SURF_models
228 * \brief Workstation model extension public
230 * Public functions specific to the workstation model.
232 typedef struct surf_workstation_model_extension_public {
233 surf_action_t(*execute) (void *workstation, double size); /**< Execute a computation amount on a workstation
234 and create the corresponding action */
235 surf_action_t(*sleep) (void *workstation, double duration); /**< Make a workstation sleep during a given duration */
236 e_surf_resource_state_t(*get_state) (void *workstation); /**< Return the CPU state of a workstation */
237 double (*get_speed) (void *workstation, double load); /**< Return the speed of a workstation */
238 double (*get_available_speed) (void *workstation); /**< Return tha available speed of a workstation */
239 surf_action_t(*communicate) (void *workstation_src, /**< Execute a communication amount between two workstations */
240 void *workstation_dst, double size,
242 // FIXME: kill next field, which duplicates the routing
243 xbt_dynar_t(*get_route) (void *workstation_src, void *workstation_dst); /**< Get the list of links between two ws */
245 surf_action_t(*execute_parallel_task) (int workstation_nb, /**< Execute a parallel task on several workstations */
246 void **workstation_list,
247 double *computation_amount,
248 double *communication_amount,
249 double amount, double rate);
250 double (*get_link_bandwidth) (const void *link); /**< Return the current bandwidth of a network link */
251 double (*get_link_latency) (const void *link); /**< Return the current latency of a network link */
252 surf_action_t(*open) (void *workstation, const char* storage, const char* path, const char* mode);
253 surf_action_t(*close) (void *workstation, const char* storage, surf_file_t fp);
254 surf_action_t(*read) (void *workstation, const char* storage, void* ptr, size_t size, size_t nmemb, surf_file_t stream);
255 surf_action_t(*write) (void *workstation, const char* storage, const void* ptr, size_t size, size_t nmemb, surf_file_t stream);
256 surf_action_t(*stat) (void *workstation, const char* storage, surf_file_t stream);
257 int (*link_shared) (const void *link);
258 xbt_dict_t(*get_properties) (const void *resource);
259 void* (*link_create_resource) (const char *name,
261 tmgr_trace_t bw_trace,
263 tmgr_trace_t lat_trace,
264 e_surf_resource_state_t
266 tmgr_trace_t state_trace,
267 e_surf_link_sharing_policy_t
268 policy, xbt_dict_t properties);
269 void* (*cpu_create_resource) (const char *name, double power_peak,
271 tmgr_trace_t power_trace,
272 e_surf_resource_state_t state_initial,
273 tmgr_trace_t state_trace,
274 xbt_dict_t cpu_properties);
275 void (*add_traces) (void);
277 } s_surf_model_extension_workstation_t;
282 /** \ingroup SURF_models
283 * \brief Model datatype
285 * Generic data structure for a model. The workstations,
286 * the CPUs and the network links are examples of models.
288 typedef struct surf_model {
289 const char *name; /**< Name of this model */
290 s_surf_action_state_t states; /**< Any living action on this model */
292 e_surf_action_state_t(*action_state_get) (surf_action_t action);
293 /**< Return the state of an action */
294 void (*action_state_set) (surf_action_t action,
295 e_surf_action_state_t state);
296 /**< Change an action state*/
298 double (*action_get_start_time) (surf_action_t action); /**< Return the start time of an action */
299 double (*action_get_finish_time) (surf_action_t action); /**< Return the finish time of an action */
300 int (*action_unref) (surf_action_t action); /**< Specify that we don't use that action anymore */
301 void (*action_cancel) (surf_action_t action); /**< Cancel a running action */
302 void (*action_recycle) (surf_action_t action); /**< Recycle an action */
303 void (*action_data_set) (surf_action_t action, void *data); /**< Set the user data of an action */
304 void (*suspend) (surf_action_t action); /**< Suspend an action */
305 void (*resume) (surf_action_t action); /**< Resume a suspended action */
306 int (*is_suspended) (surf_action_t action); /**< Return whether an action is suspended */
307 void (*set_max_duration) (surf_action_t action, double duration); /**< Set the max duration of an action*/
308 void (*set_priority) (surf_action_t action, double priority); /**< Set the priority of an action */
310 void (*set_category) (surf_action_t action, const char *category); /**< Set the category of an action */
312 double (*get_remains) (surf_action_t action); /**< Get the remains of an action */
313 #ifdef HAVE_LATENCY_BOUND_TRACKING
314 int (*get_latency_limited) (surf_action_t action); /**< Return 1 if action is limited by latency, 0 otherwise */
317 surf_model_private_t model_private;
320 s_surf_model_extension_cpu_t cpu;
321 s_surf_model_extension_network_t network;
322 s_surf_model_extension_storage_t storage;
323 s_surf_model_extension_workstation_t workstation;
327 surf_model_t surf_model_init(void);
328 void surf_model_exit(surf_model_t model);
330 static inline void *surf_cpu_resource_by_name(const char *name) {
331 return xbt_lib_get_or_null(host_lib, name, SURF_CPU_LEVEL);
333 static inline void *surf_workstation_resource_by_name(const char *name){
334 return xbt_lib_get_or_null(host_lib, name, SURF_WKS_LEVEL);
336 static inline void *surf_storage_resource_by_name(const char *name){
337 return xbt_lib_get_or_null(storage_lib, name, SURF_STORAGE_LEVEL);
340 typedef struct surf_resource {
343 xbt_dict_t properties;
344 } s_surf_resource_t, *surf_resource_t;
347 * Resource which have a metric handled by a maxmin system
352 tmgr_trace_event_t event;
355 typedef struct surf_resource_lmm {
356 s_surf_resource_t generic_resource;
357 lmm_constraint_t constraint;
358 e_surf_resource_state_t state_current;
359 tmgr_trace_event_t state_event;
360 s_surf_metric_t power;
361 } s_surf_resource_lmm_t, *surf_resource_lmm_t;
363 /**************************************/
364 /* Implementations of model object */
365 /**************************************/
368 /** \ingroup SURF_models
369 * \brief The CPU model
371 XBT_PUBLIC_DATA(surf_model_t) surf_cpu_model;
373 /** \ingroup SURF_models
374 * \brief Initializes the CPU model with the model Cas01
376 * By default, this model uses the lazy optimization mechanism that
377 * relies on partial invalidation in LMM and a heap for lazy action update.
378 * You can change this behavior by setting the cpu/optim configuration
379 * variable to a different value.
381 * This function is called by surf_workstation_model_init_CLM03
382 * so you shouldn't have to call it by yourself.
384 * \see surf_workstation_model_init_CLM03()
386 XBT_PUBLIC(void) surf_cpu_model_init_Cas01(void);
388 /** \ingroup SURF_models
389 * \brief Initializes the CPU model with trace integration [Deprecated]
391 * You shouldn't have to call it by yourself.
392 * \see surf_workstation_model_init_CLM03()
394 XBT_PUBLIC(void) surf_cpu_model_init_ti(void);
396 /** \brief This function call the share resources function needed
399 XBT_PUBLIC(double) generic_share_resources(double now);
401 /** \brief This function call the update action state function needed
404 XBT_PUBLIC(void) generic_update_actions_state(double now, double delta);
406 /** \ingroup SURF_models
407 * \brief The list of all available optimization modes (both for cpu and networks).
408 * These optimization modes can be set using --cfg=cpu/optim:... and --cfg=network/optim:...
410 XBT_PUBLIC_DATA(s_surf_model_description_t) surf_optimization_mode_description[];
412 /** \ingroup SURF_models
413 * \brief The list of all available cpu model models
415 XBT_PUBLIC_DATA(s_surf_model_description_t) surf_cpu_model_description[];
417 XBT_PUBLIC(void) create_workstations(void);
419 /**\brief create new host bypass the parser
424 /** \ingroup SURF_models
425 * \brief The network model
427 * When creating a new API on top on SURF, you shouldn't use the
428 * network model unless you know what you are doing. Only the workstation
429 * model should be accessed because depending on the platform model,
430 * the network model can be NULL.
432 XBT_PUBLIC_DATA(surf_model_t) surf_network_model;
434 /** \ingroup SURF_models
435 * \brief Same as network model 'LagrangeVelho', only with different correction factors.
437 * This model is proposed by Pierre-Nicolas Clauss and Martin Quinson and Stéphane Génaud
438 * based on the model 'LV08' and different correction factors depending on the communication
439 * size (< 1KiB, < 64KiB, >= 64KiB).
440 * See comments in the code for more information.
442 * \see surf_workstation_model_init_SMPI()
444 XBT_PUBLIC(void) surf_network_model_init_SMPI(void);
446 /** \ingroup SURF_models
447 * \brief Initializes the platform with the network model 'LegrandVelho'
449 * This model is proposed by Arnaud Legrand and Pedro Velho based on
450 * the results obtained with the GTNets simulator for onelink and
451 * dogbone sharing scenarios. See comments in the code for more information.
453 * \see surf_workstation_model_init_LegrandVelho()
455 XBT_PUBLIC(void) surf_network_model_init_LegrandVelho(void);
457 /** \ingroup SURF_models
458 * \brief Initializes the platform with the network model 'Constant'
460 * In this model, the communication time between two network cards is
461 * constant, hence no need for a routing table. This is particularly
462 * usefull when simulating huge distributed algorithms where
463 * scalability is really an issue. This function is called in
464 * conjunction with surf_workstation_model_init_compound.
466 * \see surf_workstation_model_init_compound()
468 XBT_PUBLIC(void) surf_network_model_init_Constant(void);
470 /** \ingroup SURF_models
471 * \brief Initializes the platform with the network model CM02
473 * This function is called by surf_workstation_model_init_CLM03
474 * or by yourself only if you plan using surf_workstation_model_init_compound
475 * See comments in the code for more information.
477 * \see surf_workstation_model_init_CLM03()
479 XBT_PUBLIC(void) surf_network_model_init_CM02(void);
482 * brief initialize the the network model bypassing the XML parser
484 XBT_PUBLIC(void) surf_network_model_init_bypass(const char *id,
489 /** \ingroup SURF_models
490 * \brief Initializes the platform with the network model GTNETS
491 * \param filename XML platform file name
493 * This function is called by surf_workstation_model_init_GTNETS
494 * or by yourself only if you plan using surf_workstation_model_init_compound
496 * \see surf_workstation_model_init_GTNETS()
498 XBT_PUBLIC(void) surf_network_model_init_GTNETS(void);
502 /** \ingroup SURF_models
503 * \brief Initializes the platform with the network model NS3
504 * \param filename XML platform file name
506 * This function is called by surf_workstation_model_init_NS3
507 * or by yourself only if you plan using surf_workstation_model_init_compound
509 * \see surf_workstation_model_init_NS3()
511 XBT_PUBLIC(void) surf_network_model_init_NS3(void);
514 /** \ingroup SURF_models
515 * \brief Initializes the platform with the network model Reno
516 * \param filename XML platform file name
518 * The problem is related to max( sum( arctan(C * Df * xi) ) ).
521 * [LOW03] S. H. Low. A duality model of TCP and queue management algorithms.
522 * IEEE/ACM Transaction on Networking, 11(4):525-536, 2003.
524 * Call this function only if you plan using surf_workstation_model_init_compound.
527 XBT_PUBLIC(void) surf_network_model_init_Reno(void);
529 /** \ingroup SURF_models
530 * \brief Initializes the platform with the network model Reno2
531 * \param filename XML platform file name
533 * The problem is related to max( sum( arctan(C * Df * xi) ) ).
536 * [LOW01] S. H. Low. A duality model of TCP and queue management algorithms.
537 * IEEE/ACM Transaction on Networking, 11(4):525-536, 2003.
539 * Call this function only if you plan using surf_workstation_model_init_compound.
542 XBT_PUBLIC(void) surf_network_model_init_Reno2(void);
544 /** \ingroup SURF_models
545 * \brief Initializes the platform with the network model Vegas
546 * \param filename XML platform file name
548 * This problem is related to max( sum( a * Df * ln(xi) ) ) which is equivalent
549 * to the proportional fairness.
552 * [LOW03] S. H. Low. A duality model of TCP and queue management algorithms.
553 * IEEE/ACM Transaction on Networking, 11(4):525-536, 2003.
555 * Call this function only if you plan using surf_workstation_model_init_compound.
558 XBT_PUBLIC(void) surf_network_model_init_Vegas(void);
560 /** \ingroup SURF_models
561 * \brief The list of all available network model models
563 XBT_PUBLIC_DATA(s_surf_model_description_t)
564 surf_network_model_description[];
571 /** \ingroup SURF_models
572 * \brief The storage model
574 XBT_PUBLIC(void) surf_storage_model_init_default(void);
576 /** \ingroup SURF_models
577 * \brief The list of all available storage modes.
578 * This storage mode can be set using --cfg=storage/model:...
580 XBT_PUBLIC_DATA(s_surf_model_description_t) surf_storage_model_description[];
588 /** \ingroup SURF_models
589 * \brief The workstation model
591 * Note that when you create an API on top of SURF,
592 * the workstation model should be the only one you use
593 * because depending on the platform model, the network model and the CPU model
596 XBT_PUBLIC_DATA(surf_model_t) surf_workstation_model;
598 /** \ingroup SURF_models
599 * \brief Initializes the platform with a compound workstation model
601 * This function should be called after a cpu_model and a
602 * network_model have been set up.
605 XBT_PUBLIC(void) surf_workstation_model_init_compound(void);
607 /** \ingroup SURF_models
608 * \brief Initializes the platform with the current best network and cpu models at hand
610 * This platform model seperates the workstation model and the network model.
611 * The workstation model will be initialized with the model compound, the network
612 * model with the model LV08 (with cross traffic support) and the CPU model with
614 * Such model is subject to modification with warning in the ChangeLog so monitor it!
617 XBT_PUBLIC(void) surf_workstation_model_init_current_default(void);
619 /** \ingroup SURF_models
620 * \brief Initializes the platform with the workstation model CLM03
622 * This platform model seperates the workstation model and the network model.
623 * The workstation model will be initialized with the model CLM03, the network
624 * model with the model CM02 and the CPU model with the model Cas01.
625 * In future releases, some other network models will be implemented and will be
626 * combined with the workstation model CLM03.
629 XBT_PUBLIC(void) surf_workstation_model_init_CLM03(void);
631 /** \ingroup SURF_models
632 * \brief Initializes the platform with the model KCCFLN05
634 * With this model, only parallel tasks can be used. Resource sharing
635 * is done by identifying bottlenecks and giving an equal share of
636 * the model to each action.
639 XBT_PUBLIC(void) surf_workstation_model_init_ptask_L07(void);
641 /** \ingroup SURF_models
642 * \brief The list of all available workstation model models
644 XBT_PUBLIC_DATA(s_surf_model_description_t)
645 surf_workstation_model_description[];
647 /** \ingroup SURF_models
648 * \brief List of initialized models
650 XBT_PUBLIC_DATA(xbt_dynar_t) model_list;
652 /*******************************************/
653 /*** SURF Globals **************************/
654 /*******************************************/
655 XBT_PUBLIC_DATA(xbt_cfg_t) _surf_cfg_set;
657 /** \ingroup SURF_simulation
658 * \brief Initialize SURF
659 * \param argc argument number
660 * \param argv arguments
662 * This function has to be called to initialize the common
663 * structures. Then you will have to create the environment by
665 * e.g. surf_workstation_model_init_CLM03()
667 * \see surf_workstation_model_init_CLM03(), surf_workstation_model_init_compound(), surf_exit()
669 XBT_PUBLIC(void) surf_init(int *argc, char **argv); /* initialize common structures */
671 /** \ingroup SURF_simulation
672 * \brief Finish simulation initialization
674 * This function must be called before the first call to surf_solve()
676 XBT_PUBLIC(void) surf_presolve(void);
678 /** \ingroup SURF_simulation
679 * \brief Performs a part of the simulation
680 * \param max_date Maximum date to update the simulation to, or -1
681 * \return the elapsed time, or -1.0 if no event could be executed
683 * This function execute all possible events, update the action states
684 * and returns the time elapsed.
685 * When you call execute or communicate on a model, the corresponding actions
686 * are not executed immediately but only when you call surf_solve.
687 * Note that the returned elapsed time can be zero.
689 XBT_PUBLIC(double) surf_solve(double max_date);
691 /** \ingroup SURF_simulation
692 * \brief Return the current time
694 * Return the current time in millisecond.
696 XBT_PUBLIC(double) surf_get_clock(void);
698 /** \ingroup SURF_simulation
705 XBT_PUBLIC(void) surf_exit(void);
707 /* Prototypes of the functions that handle the properties */
708 XBT_PUBLIC_DATA(xbt_dict_t) current_property_set; /* the prop set for the currently parsed element (also used in SIMIX) */
709 XBT_PUBLIC(void) parse_properties(void);
711 /* surf parse file related (public because called from a test suite) */
712 XBT_PUBLIC(void) parse_platform_file(const char *file);
714 /* Stores the sets */
715 XBT_PUBLIC_DATA(xbt_dict_t) set_list;
717 /* For the trace and trace:connect tag (store their content till the end of the parsing) */
718 XBT_PUBLIC_DATA(xbt_dict_t) traces_set_list;
719 XBT_PUBLIC_DATA(xbt_dict_t) trace_connect_list_host_avail;
720 XBT_PUBLIC_DATA(xbt_dict_t) trace_connect_list_power;
721 XBT_PUBLIC_DATA(xbt_dict_t) trace_connect_list_link_avail;
722 XBT_PUBLIC_DATA(xbt_dict_t) trace_connect_list_bandwidth;
723 XBT_PUBLIC_DATA(xbt_dict_t) trace_connect_list_latency;
726 XBT_PUBLIC(double) get_cpu_power(const char *power);
728 int surf_get_nthreads(void);
729 void surf_set_nthreads(int nthreads);
732 #endif /* _SURF_SURF_H */