#ifndef __STARPU_SCHED_NODE_H__ #define __STARPU_SCHED_NODE_H__ #include #include #ifdef STARPU_HAVE_HWLOC #include #endif /* struct starpu_sched_node are scheduler modules, a scheduler is a tree-like * structure of them, some parts of scheduler can be shared by several contexes * to perform some local optimisations, so, for all nodes, a list of father is * defined indexed by sched_ctx_id * * they embed there specialised method in a pseudo object-style, so calls are like node->push_task(node,task) * */ struct starpu_sched_node { /* node->push_task(node, task) * this function is called to push a task on node subtree, this can either * perform a recursive call on a child or store the task in the node, then * it will be returned by a further pop_task call * * the caller must ensure that node is able to execute task */ int (*push_task)(struct starpu_sched_node *, struct starpu_task *); /* this function is called by workers to get a task on them fathers * this function should first return a localy stored task or perform * a recursive call on father * * a default implementation simply do a recursive call on father */ struct starpu_task * (*pop_task)(struct starpu_sched_node *, unsigned sched_ctx_id); /* this function is an heuristic that compute load of subtree, basicaly * it compute * estimated_load(node) = sum(estimated_load(node_childs)) + * nb_local_tasks / average(relative_speedup(underlying_worker)) */ double (*estimated_load)(struct starpu_sched_node * node); double (*estimated_end)(struct starpu_sched_node * node); /* the numbers of node's childs */ int nchilds; /* the vector of node's childs */ struct starpu_sched_node ** childs; /* may be shared by several contexts * so we need several fathers */ struct starpu_sched_node * fathers[STARPU_NMAX_SCHED_CTXS]; /* the set of workers in the node's subtree */ struct starpu_bitmap * workers; /* the workers available in context * this member is set with : * node->workers UNION tree->workers UNION * node->child[i]->workers_in_ctx iff exist x such as node->childs[i]->fathers[x] == node */ struct starpu_bitmap * workers_in_ctx; /* is_homogeneous is 0 iff workers in the node's subtree are heterogeneous, * this field is set and updated automaticaly, you shouldn't write on it */ int is_homogeneous; /* node's private data, no restriction on use */ void * data; void (*add_child)(struct starpu_sched_node * node, struct starpu_sched_node * child); void (*remove_child)(struct starpu_sched_node * node, struct starpu_sched_node * child); /* this function is called for each node when workers are added or removed from a context */ void (*notify_change_workers)(struct starpu_sched_node * node); /* this function is called by starpu_sched_node_destroy just before freeing node */ void (*deinit_data)(struct starpu_sched_node * node); #ifdef STARPU_HAVE_HWLOC /* in case of a hierarchical scheduler, this is set to the part of * topology that is binded to this node, eg: a numa node for a ws * node that would balance load between underlying sockets */ hwloc_obj_t obj; #endif }; struct starpu_sched_tree { struct starpu_sched_node * root; struct starpu_bitmap * workers; unsigned sched_ctx_id; /* this lock is used to protect the scheduler, * it is taken in read mode pushing a task * and in write mode for adding or removing workers */ starpu_pthread_mutex_t lock; }; struct starpu_sched_node * starpu_sched_node_create(void); void starpu_sched_node_destroy(struct starpu_sched_node * node); void starpu_sched_node_set_father(struct starpu_sched_node *node, struct starpu_sched_node *father_node, unsigned sched_ctx_id); void starpu_sched_node_add_child(struct starpu_sched_node * node, struct starpu_sched_node * child); void starpu_sched_node_remove_child(struct starpu_sched_node * node, struct starpu_sched_node * child); int starpu_sched_node_can_execute_task(struct starpu_sched_node * node, struct starpu_task * task); int STARPU_WARN_UNUSED_RESULT starpu_sched_node_execute_preds(struct starpu_sched_node * node, struct starpu_task * task, double * length); double starpu_sched_node_transfer_length(struct starpu_sched_node * node, struct starpu_task * task); /* no public create function for workers because we dont want to have several node_worker for a single workerid */ struct starpu_sched_node * starpu_sched_node_worker_get(int workerid); /* this function compare the available function of the node with the standard available for worker nodes*/ int starpu_sched_node_is_worker(struct starpu_sched_node * node); int starpu_sched_node_is_simple_worker(struct starpu_sched_node * node); int starpu_sched_node_is_combined_worker(struct starpu_sched_node * node); int starpu_sched_node_worker_get_workerid(struct starpu_sched_node * worker_node); struct starpu_sched_node * starpu_sched_node_fifo_create(void * arg STARPU_ATTRIBUTE_UNUSED); int starpu_sched_node_is_fifo(struct starpu_sched_node * node); struct starpu_sched_node * starpu_sched_node_work_stealing_create(void * arg STARPU_ATTRIBUTE_UNUSED); int starpu_sched_node_is_work_stealing(struct starpu_sched_node * node); int starpu_sched_tree_work_stealing_push_task(struct starpu_task *task); struct starpu_sched_node * starpu_sched_node_random_create(void * arg STARPU_ATTRIBUTE_UNUSED); int starpu_sched_node_is_random(struct starpu_sched_node *); struct starpu_heft_data { double alpha; double beta; double gamma; double idle_power; struct starpu_sched_node * (*no_perf_model_node_create)(void * arg_no_perf_model); void * arg_no_perf_model; struct starpu_sched_node * (*calibrating_node_create)(void * arg_calibrating_node); void * arg_calibrating_node; }; /* create a node with heft_data paremeters a copy the struct starpu_heft_data * given is performed during the init_data call the heft node doesnt do anything but pushing tasks on no_perf_model_node and calibrating_node */ struct starpu_sched_node * starpu_sched_node_heft_create(struct starpu_heft_data * heft_data); int starpu_sched_node_is_heft(struct starpu_sched_node * node); /* this node select the best implementation for the first worker in context that can execute task. * and fill task->predicted and task->predicted_transfer * cannot have several childs if push_task is called */ struct starpu_sched_node * starpu_sched_node_best_implementation_create(void * arg STARPU_ATTRIBUTE_UNUSED); /*create an empty tree */ struct starpu_sched_tree * starpu_sched_tree_create(unsigned sched_ctx_id); void starpu_sched_tree_destroy(struct starpu_sched_tree * tree); /* destroy node and all his child * except if they are shared between several contexts */ void starpu_sched_node_destroy_rec(struct starpu_sched_node * node, unsigned sched_ctx_id); /* update all the node->workers member recursively */ void starpu_sched_tree_update_workers(struct starpu_sched_tree * t); /* idem for workers_in_ctx */ void starpu_sched_tree_update_workers_in_ctx(struct starpu_sched_tree * t); /* wake up underlaying workers of node */ void starpu_sched_node_available(struct starpu_sched_node * node); int starpu_sched_tree_push_task(struct starpu_task * task); struct starpu_task * starpu_sched_tree_pop_task(unsigned sched_ctx_id); void starpu_sched_tree_add_workers(unsigned sched_ctx_id, int *workerids, unsigned nworkers); void starpu_sched_tree_remove_workers(unsigned sched_ctx_id, int *workerids, unsigned nworkers); void starpu_sched_node_worker_pre_exec_hook(struct starpu_task * task); void starpu_sched_node_worker_post_exec_hook(struct starpu_task * task); struct starpu_bitmap * starpu_bitmap_create(void); void starpu_bitmap_destroy(struct starpu_bitmap *); void starpu_bitmap_set(struct starpu_bitmap *, int); void starpu_bitmap_unset(struct starpu_bitmap *, int); void starpu_bitmap_unset_all(struct starpu_bitmap *); int starpu_bitmap_get(struct starpu_bitmap *, int); /* basicaly compute starpu_bitmap_unset_all(a) ; a = b & c; */ void starpu_bitmap_unset_and(struct starpu_bitmap * a, struct starpu_bitmap * b, struct starpu_bitmap * c); /* this is basically compute a |= b;*/ void starpu_bitmap_or(struct starpu_bitmap * a, struct starpu_bitmap * b); //return 1 iff e set in b1 AND e set in b2 int starpu_bitmap_and_get(struct starpu_bitmap * b1, struct starpu_bitmap * b2, int e); int starpu_bitmap_cardinal(struct starpu_bitmap *); //return the index of first bit, -1 if none int starpu_bitmap_first(struct starpu_bitmap *); int starpu_bitmap_last(struct starpu_bitmap *); //return the index of bit right after e, -1 if none int starpu_bitmap_next(struct starpu_bitmap *, int e); #endif