1 /* A few tests for the maxmin library */
3 /* Copyright (c) 2007-2017. The SimGrid Team.
4 * All rights reserved. */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include "simgrid/msg.h"
10 #include "src/surf/maxmin_private.hpp"
11 #include "src/surf/surf_interface.hpp"
12 #include "surf/maxmin.hpp"
14 #include "xbt/module.h"
15 #include "xbt/sysdep.h"
19 XBT_LOG_NEW_DEFAULT_CATEGORY(surf_test, "Messages specific for surf example");
21 #define PRINT_VAR(var) XBT_DEBUG(#var " = %g",lmm_variable_getvalue(var))
22 #define SHOW_EXPR(expr) XBT_DEBUG(#expr " = %g",expr)
25 /* ==l1== L2 ==L3== */
28 enum method_t { MAXMIN, LAGRANGE_RENO, LAGRANGE_VEGAS };
30 static double dichotomy(double func(double), double min, double max, double min_error)
32 double overall_error = 2 * min_error;
34 double min_func = func(min);
35 double max_func = func(max);
37 if ((min_func > 0 && max_func > 0))
39 if ((min_func < 0 && max_func < 0))
41 if ((min_func > 0 && max_func < 0))
46 while (overall_error > min_error) {
47 SHOW_EXPR(overall_error);
48 xbt_assert(min_func <= 0 || max_func <= 0);
49 xbt_assert(min_func >= 0 || max_func >= 0);
50 xbt_assert(min_func <= 0 || max_func >= 0);
57 double middle = (max + min) / 2.0;
58 if (fabs(min - middle) < 1e-12 || fabs(max - middle) < 1e-12) {
61 double middle_func = func(middle);
63 SHOW_EXPR(middle_func);
65 if (middle_func < 0) {
67 min_func = middle_func;
68 overall_error = max_func - middle_func;
69 } else if (middle_func > 0) {
71 max_func = middle_func;
72 overall_error = middle_func - min_func;
77 return ((min + max) / 2.0);
82 static double diff_lagrange_test_1(double x)
84 return -(3 / (1 + 3 * x * x / 2) - 3 / (2 * (3 * (a_test_1 - x) * (a_test_1 - x) / 2 + 1)) +
85 3 / (2 * (3 * (b_test_1 - a_test_1 + x) * (b_test_1 - a_test_1 + x) / 2 + 1)));
88 static void test1(method_t method)
93 if (method == LAGRANGE_VEGAS)
94 lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp, func_vegas_fpi);
95 else if (method == LAGRANGE_RENO)
96 lmm_set_default_protocol_function(func_reno_f, func_reno_fpi, func_reno_fpi);
98 lmm_system_t Sys = new s_lmm_system_t(true);
99 lmm_constraint_t L1 = Sys->constraint_new(nullptr, a);
100 lmm_constraint_t L2 = Sys->constraint_new(nullptr, b);
101 lmm_constraint_t L3 = Sys->constraint_new(nullptr, a);
103 lmm_variable_t R_1_2_3 = Sys->variable_new(nullptr, 1.0, -1.0, 3);
104 lmm_variable_t R_1 = Sys->variable_new(nullptr, 1.0, -1.0, 1);
105 lmm_variable_t R_2 = Sys->variable_new(nullptr, 1.0, -1.0, 1);
106 lmm_variable_t R_3 = Sys->variable_new(nullptr, 1.0, -1.0, 1);
108 Sys->update_variable_weight(R_1_2_3, 1.0);
109 Sys->update_variable_weight(R_1, 1.0);
110 Sys->update_variable_weight(R_2, 1.0);
111 Sys->update_variable_weight(R_3, 1.0);
113 Sys->expand(L1, R_1_2_3, 1.0);
114 Sys->expand(L2, R_1_2_3, 1.0);
115 Sys->expand(L3, R_1_2_3, 1.0);
117 Sys->expand(L1, R_1, 1.0);
118 Sys->expand(L2, R_2, 1.0);
119 Sys->expand(L3, R_3, 1.0);
121 if (method == MAXMIN) {
125 if (method == LAGRANGE_VEGAS) {
126 x = 3 * a / 4 - 3 * b / 8 + sqrt(9 * b * b + 4 * a * a - 4 * a * b) / 8;
127 /* Computed with mupad and D_f=1.0 */
134 } else if (method == LAGRANGE_RENO) {
137 x = dichotomy(diff_lagrange_test_1, 0, a, 1e-13);
144 xbt_die( "Invalid method");
149 double max_deviation = 0.0;
150 max_deviation = std::max(max_deviation, fabs(lmm_variable_getvalue(R_1) - x));
151 max_deviation = std::max(max_deviation, fabs(lmm_variable_getvalue(R_3) - x));
152 max_deviation = std::max(max_deviation, fabs(lmm_variable_getvalue(R_2) - (b - a + x)));
153 max_deviation = std::max(max_deviation, fabs(lmm_variable_getvalue(R_1_2_3) - (a - x)));
155 if (max_deviation > 0.00001) { // Legacy value used in lagrange.c
156 XBT_WARN("Max Deviation from optimal solution : %g", max_deviation);
157 XBT_WARN("Found x = %1.20f", x);
158 XBT_WARN("Deviation from optimal solution (R_1 = %g): %1.20f", x, lmm_variable_getvalue(R_1) - x);
159 XBT_WARN("Deviation from optimal solution (R_2 = %g): %1.20f", b - a + x,
160 lmm_variable_getvalue(R_2) - (b - a + x));
161 XBT_WARN("Deviation from optimal solution (R_3 = %g): %1.20f", x, lmm_variable_getvalue(R_3) - x);
162 XBT_WARN("Deviation from optimal solution (R_1_2_3 = %g): %1.20f", a - x,
163 lmm_variable_getvalue(R_1_2_3) - (a - x));
172 Sys->variable_free(R_1_2_3);
173 Sys->variable_free(R_1);
174 Sys->variable_free(R_2);
175 Sys->variable_free(R_3);
179 static void test2(method_t method)
181 if (method == LAGRANGE_VEGAS)
182 lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp, func_vegas_fpi);
183 if (method == LAGRANGE_RENO)
184 lmm_set_default_protocol_function(func_reno_f, func_reno_fp, func_reno_fpi);
186 lmm_system_t Sys = new s_lmm_system_t(true);
187 lmm_constraint_t CPU1 = Sys->constraint_new(nullptr, 200.0);
188 lmm_constraint_t CPU2 = Sys->constraint_new(nullptr, 100.0);
190 lmm_variable_t T1 = Sys->variable_new(nullptr, 1.0, -1.0, 1);
191 lmm_variable_t T2 = Sys->variable_new(nullptr, 1.0, -1.0, 1);
193 Sys->update_variable_weight(T1, 1.0);
194 Sys->update_variable_weight(T2, 1.0);
196 Sys->expand(CPU1, T1, 1.0);
197 Sys->expand(CPU2, T2, 1.0);
199 if (method == MAXMIN) {
201 } else if (method == LAGRANGE_VEGAS || method == LAGRANGE_RENO) {
204 xbt_die("Invalid method");
210 Sys->variable_free(T1);
211 Sys->variable_free(T2);
215 static void test3(method_t method)
220 double** A = new double*[links + 5];
221 /* array to add the constraints of fictitious variables */
222 double B[15] = { 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1 };
224 for (int i = 0; i < links + 5; i++) {
225 A[i] = new double[flows + 5];
226 for (int j = 0; j < flows + 5; j++) {
229 if (i >= links || j >= flows) {
235 /*matrix that store the constraints/topology */
236 A[0][1] = A[0][7] = 1.0;
237 A[1][1] = A[1][7] = A[1][8] = 1.0;
238 A[2][1] = A[2][8] = 1.0;
240 A[4][0] = A[4][3] = A[4][9] = 1.0;
241 A[5][0] = A[5][3] = A[5][4] = A[5][9] = 1.0;
242 A[6][0] = A[6][4] = A[6][9] = A[6][10] = 1.0;
243 A[7][2] = A[7][4] = A[7][6] = A[7][9] = A[7][10] = 1.0;
244 A[8][2] = A[8][10] = 1.0;
245 A[9][5] = A[9][6] = A[9][9] = 1.0;
252 if (method == LAGRANGE_VEGAS)
253 lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp, func_vegas_fpi);
254 if (method == LAGRANGE_RENO)
255 lmm_set_default_protocol_function(func_reno_f, func_reno_fp, func_reno_fpi);
257 lmm_system_t Sys = new s_lmm_system_t(true);
259 /* Creates the constraints */
260 lmm_constraint_t* tmp_cnst = new lmm_constraint_t[15];
261 for (int i = 0; i < 15; i++)
262 tmp_cnst[i] = Sys->constraint_new(nullptr, B[i]);
264 /* Creates the variables */
265 lmm_variable_t* tmp_var = new lmm_variable_t[16];
266 for (int j = 0; j < 16; j++) {
267 tmp_var[j] = Sys->variable_new(nullptr, 1.0, -1.0, 15);
268 Sys->update_variable_weight(tmp_var[j], 1.0);
271 /* Link constraints and variables */
272 for (int i = 0; i < 15; i++)
273 for (int j = 0; j < 16; j++)
275 Sys->expand(tmp_cnst[i], tmp_var[j], 1.0);
277 if (method == MAXMIN) {
279 } else if (method == LAGRANGE_VEGAS) {
281 } else if (method == LAGRANGE_RENO) {
284 xbt_die("Invalid method");
287 for (int j = 0; j < 16; j++)
288 PRINT_VAR(tmp_var[j]);
290 for (int j = 0; j < 16; j++)
291 Sys->variable_free(tmp_var[j]);
295 for (int i = 0; i < links + 5; i++)
300 int main(int argc, char** argv)
302 MSG_init(&argc, argv);
303 XBT_INFO("***** Test 1 (Max-Min)");
305 XBT_INFO("***** Test 1 (Lagrange - Vegas)");
306 test1(LAGRANGE_VEGAS);
307 XBT_INFO("***** Test 1 (Lagrange - Reno)");
308 test1(LAGRANGE_RENO);
310 XBT_INFO("***** Test 2 (Max-Min)");
312 XBT_INFO("***** Test 2 (Lagrange - Vegas)");
313 test2(LAGRANGE_VEGAS);
314 XBT_INFO("***** Test 2 (Lagrange - Reno)");
315 test2(LAGRANGE_RENO);
317 XBT_INFO("***** Test 3 (Max-Min)");
319 XBT_INFO("***** Test 3 (Lagrange - Vegas)");
320 test3(LAGRANGE_VEGAS);
321 XBT_INFO("***** Test 3 (Lagrange - Reno)");
322 test3(LAGRANGE_RENO);