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/* A few tests for the maxmin library */
/* Copyright (c) 2007-2025. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#include "simgrid/s4u/Engine.hpp"
#include "src/kernel/lmm/maxmin.hpp"
#include "xbt/log.h"
#include "xbt/sysdep.h"
#include <algorithm>
#include <array>
#include <cmath>
XBT_LOG_NEW_DEFAULT_CATEGORY(test, "Messages specific for this example");
namespace lmm = simgrid::kernel::lmm;
#define PRINT_VAR(var) XBT_DEBUG(_XBT_STRINGIFY(var) " = %g", (var)->get_value())
#define SHOW_EXPR(expr) XBT_DEBUG(_XBT_STRINGIFY(expr) " = %g", (expr))
/* ______ */
/* ==l1== L2 ==L3== */
/* ------ */
static void test1()
{
double a = 1.0;
double b = 10.0;
lmm::MaxMin Sys(false);
lmm::Constraint* L1 = Sys.constraint_new(nullptr, a);
lmm::Constraint* L2 = Sys.constraint_new(nullptr, b);
lmm::Constraint* L3 = Sys.constraint_new(nullptr, a);
lmm::Variable* R_1_2_3 = Sys.variable_new(nullptr, 1.0, -1.0, 3);
lmm::Variable* R_1 = Sys.variable_new(nullptr, 1.0, -1.0, 1);
lmm::Variable* R_2 = Sys.variable_new(nullptr, 1.0, -1.0, 1);
lmm::Variable* R_3 = Sys.variable_new(nullptr, 1.0, -1.0, 1);
Sys.update_variable_penalty(R_1_2_3, 1.0);
Sys.update_variable_penalty(R_1, 1.0);
Sys.update_variable_penalty(R_2, 1.0);
Sys.update_variable_penalty(R_3, 1.0);
Sys.expand(L1, R_1_2_3, 1.0);
Sys.expand(L2, R_1_2_3, 1.0);
Sys.expand(L3, R_1_2_3, 1.0);
Sys.expand(L1, R_1, 1.0);
Sys.expand(L2, R_2, 1.0);
Sys.expand(L3, R_3, 1.0);
Sys.solve();
PRINT_VAR(R_1_2_3);
PRINT_VAR(R_1);
PRINT_VAR(R_2);
PRINT_VAR(R_3);
Sys.variable_free(R_1_2_3);
Sys.variable_free(R_1);
Sys.variable_free(R_2);
Sys.variable_free(R_3);
}
static void test2()
{
lmm::MaxMin Sys(false);
lmm::Constraint* CPU1 = Sys.constraint_new(nullptr, 200.0);
lmm::Constraint* CPU2 = Sys.constraint_new(nullptr, 100.0);
lmm::Variable* T1 = Sys.variable_new(nullptr, 1.0, -1.0, 1);
lmm::Variable* T2 = Sys.variable_new(nullptr, 1.0, -1.0, 1);
Sys.update_variable_penalty(T1, 1.0);
Sys.update_variable_penalty(T2, 1.0);
Sys.expand(CPU1, T1, 1.0);
Sys.expand(CPU2, T2, 1.0);
Sys.solve();
PRINT_VAR(T1);
PRINT_VAR(T2);
Sys.variable_free(T1);
Sys.variable_free(T2);
}
static void test3()
{
constexpr int flows = 11;
constexpr int links = 10;
std::array<std::array<double, flows + 5>, links + 5> A;
/* array to add the constraints of fictitious variables */
std::array<double, 15> B{{10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1}};
for (int i = 0; i < links + 5; i++) {
for (int j = 0; j < flows + 5; j++) {
A[i][j] = 0.0;
if (i >= links || j >= flows) {
A[i][j] = 0.0;
}
}
}
/*matrix that store the constraints/topology */
A[0][1] = A[0][7] = 1.0;
A[1][1] = A[1][7] = A[1][8] = 1.0;
A[2][1] = A[2][8] = 1.0;
A[3][8] = 1.0;
A[4][0] = A[4][3] = A[4][9] = 1.0;
A[5][0] = A[5][3] = A[5][4] = A[5][9] = 1.0;
A[6][0] = A[6][4] = A[6][9] = A[6][10] = 1.0;
A[7][2] = A[7][4] = A[7][6] = A[7][9] = A[7][10] = 1.0;
A[8][2] = A[8][10] = 1.0;
A[9][5] = A[9][6] = A[9][9] = 1.0;
A[10][11] = 1.0;
A[11][12] = 1.0;
A[12][13] = 1.0;
A[13][14] = 1.0;
A[14][15] = 1.0;
lmm::MaxMin Sys(false);
/* Creates the constraints */
std::array<lmm::Constraint*, 15> tmp_cnst;
for (int i = 0; i < 15; i++)
tmp_cnst[i] = Sys.constraint_new(nullptr, B[i]);
/* Creates the variables */
std::array<lmm::Variable*, 16> tmp_var;
for (int j = 0; j < 16; j++) {
tmp_var[j] = Sys.variable_new(nullptr, 1.0, -1.0, 15);
Sys.update_variable_penalty(tmp_var[j], 1.0);
}
/* Link constraints and variables */
for (int i = 0; i < 15; i++)
for (int j = 0; j < 16; j++)
if (A[i][j] != 0.0)
Sys.expand(tmp_cnst[i], tmp_var[j], 1.0);
Sys.solve();
for (int j = 0; j < 16; j++)
PRINT_VAR(tmp_var[j]);
for (int j = 0; j < 16; j++)
Sys.variable_free(tmp_var[j]);
}
int main(int argc, char** argv)
{
simgrid::s4u::Engine e(&argc, argv);
XBT_INFO("***** Test 1");
test1();
XBT_INFO("***** Test 2");
test2();
XBT_INFO("***** Test 3");
test3();
return 0;
}
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