X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/be168aff446047bcd2ac666608920a2ba9def0cd..df512be8cc88674c7862273fc58c8f3b8970384c:/src/include/surf/maxmin.h diff --git a/src/include/surf/maxmin.h b/src/include/surf/maxmin.h index 3394673717..3b102b7f62 100644 --- a/src/include/surf/maxmin.h +++ b/src/include/surf/maxmin.h @@ -7,7 +7,7 @@ #ifndef _SURF_MAXMIN_H #define _SURF_MAXMIN_H -#include "portable.h" +#include "src/portable.h" #include "xbt/misc.h" #include "xbt/asserts.h" #include "surf/datatypes.h" @@ -16,15 +16,15 @@ /** @addtogroup SURF_lmm * @details - * A linear maxmin solver to resolves inequations systems. + * A linear maxmin solver to resolve inequations systems. * * Most SimGrid model rely on a "fluid/steady-state" modeling that - * samount to share resources between actions at relatively + * simulate the sharing of resources between actions at relatively * coarse-grain. Such sharing is generally done by solving a set of * linear inequations. Let's take an example and assume we have the * variables \f$x_1\f$, \f$x_2\f$, \f$x_3\f$, and \f$x_4\f$ . Let's * say that \f$x_1\f$ and \f$x_2\f$ correspond to activities running - * and the same CPU \f$A\f$ whose capacity is \f$C_A\f$ . In such a + * and the same CPU \f$A\f$ whose capacity is \f$C_A\f$. In such a * case, we need to enforce: * * \f[ x_1 + x_2 \leq C_A \f] @@ -53,10 +53,12 @@ * - bound (set) * - shared (set) * - usage (computed) + * * Variable: * - weight (set) * - bound (set) * - value (computed) + * * Element: * - value (set) * @@ -77,13 +79,17 @@ * var1.weight * var1.value * elem1.value + var2.weight * var2.value * elem2.value <= cons1.bound * var2.weight * var2.value * elem3.value + var3.weight * var3.value * elem4.value <= cons2.bound * - * where `var1.value`, `var2.value` and `var3.value` are the unknown values + * where `var1.value`, `var2.value` and `var3.value` are the unknown values. * - * if a constraint is not shared the sum is replace by a max + * If a constraint is not shared, the sum is replaced by a max. + * For example, a third non-shared constraint `cons3` and the associated elements `elem5` and `elem6` could write as: + * + * max( var1.weight * var1.value * elem5.value , var3.weight * var3.value * elem6.value ) <= cons3.bound + * + * This is usefull for the sharing of resources for various models. + * For instance, for the network model, each link is associated + * to a constraint and each communication to a variable. * - * Its usefull for the sharing of resources for various models. - * For instance for the network model the link are associated - * to consrtaint and the communications to variables. */ XBT_PUBLIC_DATA(double) sg_maxmin_precision;