/** @ingroup SURF_lmm
* @brief LMM element
+ * Elements can be seen as glue between constraint objects and variable objects.
+ * Basically, each variable will have a set of elements, one for each constraint where it is involved.
+ * Then, it is used to list all variables involved in constraint through constraint's element_set lists, or vice-versa list all constraints for a given variable.
*/
typedef struct lmm_element {
/* hookup to constraint */
/** @ingroup SURF_lmm
* @brief LMM constraint
+ * Each constraint contains several partially overlapping logical sets of elements:
+ * \li Disabled elements which variable's weight is zero. This variables are not at all processed by LMM, but eventually the corresponding action will enable it (at least this is the idea).
+ * \li Enabled elements which variable's weight is non-zero. They are utilized in some LMM functions.
+ * \li Active elements which variable's weight is non-zero (i.e. it is enabled) AND its element value is non-zero. LMM_solve iterates over active elements during resolution, dynamically making them active or unactive.
+ *
+ * Also note that we maintain element_set such that all enabled elements (i.e. var->weight>0) come before disabled elements.
*/
typedef struct lmm_constraint {
/* hookup to system */
s_xbt_swag_hookup_t modified_constraint_set_hookup;
s_xbt_swag_hookup_t saturated_constraint_set_hookup;
+ //TODO we could split element_set in, say, enabled_element_set and disabled_element_set depending on var->weight
+ //Could make code more readable and should not pose implementation issues (only lmm_print does not stop at the end of enabled elements
s_xbt_swag_t element_set; /* a list of lmm_element_t */
s_xbt_swag_t active_element_set; /* a list of lmm_element_t */
double remaining;
double usage;
double bound;
+ int concurrency_limit; /* The maximum number of variables that may be enabled at any time (stage variables if necessary) */
+ //TODO MARTIN Check maximum value across resources at the end of simulation and give a warning is more than e.g. 500
+ int concurrency_current; /* The current concurrency */
+ int concurrency_maximum; /* The maximum number of (enabled and disabled) variables associated to the constraint at any given time (essentially for tracing)*/
+
int sharing_policy; /* see @e_surf_link_sharing_policy_t (0: FATPIPE, 1: SHARED, 2: FULLDUPLEX) */
void *id;
int id_int;
/** @ingroup SURF_lmm
* @brief LMM variable
+ *
+ * When something prevents us from enabling a variable, we "stage" the weight that we would have like to set, so that as soon as possible we enable the variable with desired weight
*/
typedef struct lmm_variable {
/* hookup to system */
s_lmm_element_t *cnsts;
int cnsts_size;
int cnsts_number;
- double weight;
+ double weight; /* weight > 0 means variable is considered by LMM, weight == 0 means variable is not considered by LMM*/
+ double staged_weight; /* If non-zero, variable is staged for addition as soon as maxconcurrency constraints will be met */
double bound;
double value;
+ short int concurrency_share; /* The maximum number of elements that variable will add to a constraint */
void *id;
int id_int;
unsigned visited; /* used by lmm_update_modified_set */
typedef struct lmm_system {
int modified;
int selective_update_active; /* flag to update partially the system only selecting changed portions */
- unsigned visited_counter; /* used by lmm_update_modified_set */
+ unsigned visited_counter; /* used by lmm_update_modified_set and lmm_remove_modified_set to cleverly (un-)flag the constraints (more details in these functions)*/
s_xbt_swag_t variable_set; /* a list of lmm_variable_t */
s_xbt_swag_t constraint_set; /* a list of lmm_constraint_t */
extern XBT_PRIVATE double (*func_fpi_def) (lmm_variable_t, double);
#endif /* _SURF_MAXMIN_PRIVATE_H */
+
+
