starpu-max/sc_hypervisor/include/sc_hypervisor_lp.h

/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2010-2013  INRIA
 *
 * StarPU is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 *
 * StarPU is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * See the GNU Lesser General Public License in COPYING.LGPL for more details.
 */

#ifndef SCHED_CTX_HYPERVISOR_LP_H
#define SCHED_CTX_HYPERVISOR_LP_H

#include <sc_hypervisor.h>
#include <starpu_config.h>

#ifdef __cplusplus
extern "C"
{
#endif

/*
 * GNU Linear Programming Kit backend
 */
#ifdef STARPU_HAVE_GLPK_H
#include <glpk.h>
#endif //STARPU_HAVE_GLPK_H

struct sc_hypervisor_policy_task_pool; 

/* returns tmax, and computes in table res the nr of workers needed by each context st the system ends up in the smallest tmax*/
double sc_hypervisor_lp_get_nworkers_per_ctx(int nsched_ctxs, int ntypes_of_workers, double res[nsched_ctxs][ntypes_of_workers], int total_nw[ntypes_of_workers]);

/* returns tmax of the system */
double sc_hypervisor_lp_get_tmax(int nw, int *workers);

/* the linear programme determins a rational number of ressources for each ctx, we round them depending on the type of ressource */
void sc_hypervisor_lp_round_double_to_int(int ns, int nw, double res[ns][nw], int res_rounded[ns][nw]);

/* redistribute the ressource in contexts by assigning the first x available ressources to each one */
void sc_hypervisor_lp_redistribute_resources_in_ctxs(int ns, int nw, int res_rounded[ns][nw], double res[ns][nw]);

/* make the first distribution of ressource in contexts by assigning the first x available ressources to each one */
void sc_hypervisor_lp_distribute_resources_in_ctxs(int* sched_ctxs, int ns, int nw, int res_rounded[ns][nw], double res[ns][nw], int *workers, int nworkers);

/* place resources in contexts dependig on whether they already have workers or not */
void sc_hypervisor_lp_place_resources_in_ctx(int ns, int nw, double w_in_s[ns][nw], int *sched_ctxs, int *workers, unsigned do_size);

/* dichotomy btw t1 & t2 */
double sc_hypervisor_lp_find_tmax(double t1, double t2);

/* execute the lp trough dichotomy */
unsigned sc_hypervisor_lp_execute_dichotomy(int ns, int nw, double w_in_s[ns][nw], unsigned solve_lp_integer, void *specific_data,
					    double tmin, double tmax, double smallest_tmax,
					    double (*lp_estimated_distrib_func)(int ns, int nw, double draft_w_in_s[ns][nw], 
									     unsigned is_integer, double tmax, void *specifc_data));

#ifdef STARPU_HAVE_GLPK_H
/* linear program that returns 1/tmax, and computes in table res the nr of workers needed by each context st 
   the system ends up in the smallest tmax*/
double sc_hypervisor_lp_simulate_distrib_flops(int nsched_ctxs, int ntypes_of_workers, double velocity[nsched_ctxs][ntypes_of_workers], 
					       double flops[nsched_ctxs], double res[nsched_ctxs][ntypes_of_workers], int total_nw[ntypes_of_workers]);

/* linear program that simulates a distribution of tasks that minimises the execution time of the tasks in the pool */
double sc_hypervisor_lp_simulate_distrib_tasks(int ns, int nw, int nt, double w_in_s[ns][nw], double tasks[nw][nt],
					       double times[nw][nt], unsigned is_integer, double tmax, int *in_sched_ctxs,
					       struct sc_hypervisor_policy_task_pool *tmp_task_pools);

#endif // STARPU_HAVE_GLPK_H

#ifdef __cplusplus
}
#endif

#endif