/* * This file is part of the StarPU Handbook. * Copyright (C) 2009--2011 Universit@'e de Bordeaux * Copyright (C) 2010, 2011, 2012, 2013, 2014 Centre National de la Recherche Scientifique * Copyright (C) 2011, 2012 Institut National de Recherche en Informatique et Automatique * See the file version.doxy for copying conditions. */ /*! \defgroup API_Scheduling_Contexts Scheduling Contexts \brief StarPU permits on one hand grouping workers in combined workers in order to execute a parallel task and on the other hand grouping tasks in bundles that will be executed by a single specified worker. In contrast when we group workers in scheduling contexts we submit starpu tasks to them and we schedule them with the policy assigned to the context. Scheduling contexts can be created, deleted and modified dynamically. \struct starpu_sched_ctx_performance_counters Performance counters used by the starpu to indicate the hypervisor how the application and the resources are executing. \ingroup API_Scheduling_Contexts \var void (*starpu_sched_ctx_performance_counters::notify_idle_cycle)(unsigned sched_ctx_id, int worker, double idle_time) Informs the hypervisor for how long a worker has been idle in the specified context \var void (*starpu_sched_ctx_performance_counters::notify_pushed_task)(unsigned sched_ctx_id, int worker) Notifies the hypervisor that a task has been scheduled on the queue of the worker corresponding to the specified context \var void (*starpu_sched_ctx_performance_counters::notify_poped_task)(unsigned sched_ctx_id, int worker) Informs the hypervisor that a task executing a specified number of instructions has been poped from the worker \var void (*starpu_sched_ctx_performance_counters::notify_post_exec_task)(struct starpu_task *task, size_t data_size, uint32_t footprint, int hypervisor_tag, double flops) Notifies the hypervisor that a task has just been executed \var void (*starpu_sched_ctx_performance_counters::notify_submitted_job)(struct starpu_task *task, uint32_t footprint, size_t data_size) Notifies the hypervisor that a task has just been submitted \var void (*starpu_sched_ctx_performance_counters::notify_delete_context)(unsigned sched_ctx) Notifies the hypervisor that the context was deleted @name Scheduling Contexts Basic API \ingroup API_Scheduling_Contexts \fn unsigned starpu_sched_ctx_create(int *workerids_ctx, int nworkers_ctx, const char *sched_ctx_name, ...) \ingroup API_Scheduling_Contexts This function creates a scheduling context with the given parameters (see below) and assigns the workers in \p workerids_ctx to execute the tasks submitted to it. The return value represents the identifier of the context that has just been created. It will be further used to indicate the context the tasks will be submitted to. The return value should be at most \ref STARPU_NMAX_SCHED_CTXS. The arguments following the name of the scheduling context can be of the following types: \def STARPU_SCHED_CTX_POLICY_NAME \ingroup API_Scheduling_Contexts This macro is used when calling starpu_sched_ctx_create() to specify a name for a scheduling policy \def STARPU_SCHED_CTX_POLICY_STRUCT \ingroup API_Scheduling_Contexts This macro is used when calling starpu_sched_ctx_create() to specify a pointer to a scheduling policy \def STARPU_SCHED_CTX_POLICY_MIN_PRIO \ingroup API_Scheduling_Contexts This macro is used when calling starpu_sched_ctx_create() to specify a minimum scheduler priority value. \def STARPU_SCHED_CTX_POLICY_MAX_PRIO \ingroup API_Scheduling_Contexts This macro is used when calling starpu_sched_ctx_create() to specify a maximum scheduler priority value. \fn unsigned starpu_sched_ctx_create_inside_interval(const char *policy_name, const char *sched_ctx_name, int min_ncpus, int max_ncpus, int min_ngpus, int max_ngpus, unsigned allow_overlap) \ingroup API_Scheduling_Contexts Create a context indicating an approximate interval of resources \fn void starpu_sched_ctx_register_close_callback(unsigned sched_ctx_id, void (*close_callback)(unsigned sched_ctx_id, void* args), void *args) \ingroup API_Scheduling_Contexts Execute the callback whenever the last task of the context finished executing, it is called with the pramaters: sched_ctx and any other paramter needed by the application (packed in a void*) \fn void starpu_sched_ctx_add_workers(int *workerids_ctx, int nworkers_ctx, unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts This function adds dynamically the workers in \p workerids_ctx to the context \p sched_ctx_id. The last argument cannot be greater than \ref STARPU_NMAX_SCHED_CTXS. \fn void starpu_sched_ctx_remove_workers(int *workerids_ctx, int nworkers_ctx, unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts This function removes the workers in \p workerids_ctx from the context \p sched_ctx_id. The last argument cannot be greater than STARPU_NMAX_SCHED_CTXS. \fn void starpu_sched_ctx_display_workers(unsigned sched_ctx_id, FILE *f) \ingroup API_Scheduling_Contexts This function prints on the file \p f the worker names belonging to the context \p sched_ctx_id \fn void starpu_sched_ctx_delete(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts Delete scheduling context \p sched_ctx_id and transfer remaining workers to the inheritor scheduling context. \fn void starpu_sched_ctx_set_inheritor(unsigned sched_ctx_id, unsigned inheritor) \ingroup API_Scheduling_Contexts Indicate which context whill inherit the resources of this context when he will be deleted. \fn void starpu_sched_ctx_set_context(unsigned *sched_ctx_id) \ingroup API_Scheduling_Contexts Set the scheduling context the subsequent tasks will be submitted to \fn unsigned starpu_sched_ctx_get_context(void) \ingroup API_Scheduling_Contexts Return the scheduling context the tasks are currently submitted to, or ::STARPU_NMAX_SCHED_CTXS if no default context has been defined by calling the function starpu_sched_ctx_set_context(). \fn void starpu_sched_ctx_stop_task_submission(void) \ingroup API_Scheduling_Contexts Stop submitting tasks from the empty context list until the next time the context has time to check the empty context list \fn void starpu_sched_ctx_finished_submit(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts Indicate starpu that the application finished submitting to this context in order to move the workers to the inheritor as soon as possible. \fn unsigned starpu_sched_ctx_get_workers_list(unsigned sched_ctx_id, int **workerids) \ingroup API_Scheduling_Contexts Returns the list of workers in the array \p workerids, the returned value is the number of workers. The user should free the \p workerids table after finishing using it (it is allocated inside the function with the proper size) \fn unsigned starpu_sched_ctx_get_nworkers(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts Return the number of workers managed by the specified contexts (Usually needed to verify if it manages any workers or if it should be blocked) \fn unsigned starpu_sched_ctx_get_nshared_workers(unsigned sched_ctx_id, unsigned sched_ctx_id2) \ingroup API_Scheduling_Contexts Return the number of workers shared by two contexts. \fn unsigned starpu_sched_ctx_contains_worker(int workerid, unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts Return 1 if the worker belongs to the context and 0 otherwise \fn unsigned starpu_sched_ctx_worker_get_id(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts Return the workerid if the worker belongs to the context and -1 otherwise. If the thread calling this function is not a worker the function returns -1 as it calls the function \ref starpu_worker_get_id() \fn unsigned starpu_sched_ctx_overlapping_ctxs_on_worker(int workerid) \ingroup API_Scheduling_Contexts Check if a worker is shared between several contexts @name Scheduling Context Priorities \ingroup API_Scheduling_Contexts \def STARPU_MIN_PRIO \ingroup API_Scheduling_Contexts Provided for legacy reasons. \def STARPU_MAX_PRIO \ingroup API_Scheduling_Contexts Provided for legacy reasons. \def STARPU_DEFAULT_PRIO \ingroup API_Scheduling_Contexts By convention, the default priority level should be 0 so that we can statically allocate tasks with a default priority. \fn int starpu_sched_ctx_set_min_priority(unsigned sched_ctx_id, int min_prio) \ingroup API_Scheduling_Contexts Defines the minimum task priority level supported by the scheduling policy of the given scheduler context. The default minimum priority level is the same as the default priority level which is 0 by convention. The application may access that value by calling the function starpu_sched_ctx_get_min_priority(). This function should only be called from the initialization method of the scheduling policy, and should not be used directly from the application. \fn int starpu_sched_ctx_set_max_priority(unsigned sched_ctx_id, int max_prio) \ingroup API_Scheduling_Contexts Defines the maximum priority level supported by the scheduling policy of the given scheduler context. The default maximum priority level is 1. The application may access that value by calling the starpu_sched_ctx_get_max_priority function. This function should only be called from the initialization method of the scheduling policy, and should not be used directly from the application. \fn int starpu_sched_ctx_get_min_priority(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts Returns the current minimum priority level supported by the scheduling policy of the given scheduler context. \fn int starpu_sched_ctx_get_max_priority(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts Returns the current maximum priority level supported by the scheduling policy of the given scheduler context. \fn int starpu_sched_ctx_min_priority_is_set(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts todo \fn int starpu_sched_ctx_max_priority_is_set(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts todo @name Scheduling Context Worker Collection \ingroup API_Scheduling_Contexts \fn struct starpu_worker_collection *starpu_sched_ctx_create_worker_collection(unsigned sched_ctx_id, enum starpu_worker_collection_type type) \ingroup API_Scheduling_Contexts Create a worker collection of the type indicated by the last parameter for the context specified through the first parameter. \fn void starpu_sched_ctx_delete_worker_collection(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts Delete the worker collection of the specified scheduling context \fn struct starpu_worker_collection *starpu_sched_ctx_get_worker_collection(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts Return the worker collection managed by the indicated context @name Scheduling Context Link with Hypervisor \ingroup API_Scheduling_Contexts \fn void starpu_sched_ctx_set_perf_counters(unsigned sched_ctx_id, void *perf_counters) \ingroup API_Scheduling_Contexts Indicates to starpu the pointer to the performance counter \fn void starpu_sched_ctx_call_pushed_task_cb(int workerid, unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts Callback that lets the scheduling policy tell the hypervisor that a task was pushed on a worker \fn void starpu_sched_ctx_notify_hypervisor_exists(void) \ingroup API_Scheduling_Contexts Allow the hypervisor to let starpu know he's initialised \fn unsigned starpu_sched_ctx_check_if_hypervisor_exists(void) \ingroup API_Scheduling_Contexts Ask starpu if he is informed if the hypervisor is initialised \fn void starpu_sched_ctx_set_policy_data(unsigned sched_ctx_id, void *policy_data) \ingroup API_Scheduling_Contexts Allocate the scheduling policy data (private information of the scheduler like queues, variables, additional condition variables) the context \fn void *starpu_sched_ctx_get_policy_data(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts Return the scheduling policy data (private information of the scheduler) of the contexts previously assigned to. \fn void *starpu_sched_ctx_exec_parallel_code(void* (*func)(void*), void *param, unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts execute any parallel code on the workers of the sched_ctx (workers are blocked) \fn int starpu_sched_ctx_get_nready_tasks(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts todo \fn double starpu_sched_ctx_get_nready_flops(unsigned sched_ctx_id) \ingroup API_Scheduling_Contexts todo */