1 /******************************************************************************/ 2 /* */ 3 /* Copyright (c) International Business Machines Corp., 2007 */ 4 /* */ 5 /* This program is free software; you can redistribute it and/or modify */ 6 /* it under the terms of the GNU General Public License as published by */ 7 /* the Free Software Foundation; either version 2 of the License, or */ 8 /* (at your option) any later version. */ 9 /* */ 10 /* This program is distributed in the hope that it will be useful, */ 11 /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ 12 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */ 13 /* the GNU General Public License for more details. */ 14 /* */ 15 /* You should have received a copy of the GNU General Public License */ 16 /* along with this program; if not, write to the Free Software */ 17 /* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ 18 /* */ 19 /******************************************************************************/ 20 21 /******************************************************************************/ 22 /* */ 23 /* File: cpuctl_test04.c */ 24 /* */ 25 /* Description: This is a c program that tests the cpucontroller fairness of */ 26 /* scheduling the tasks according to their group shares. This */ 27 /* testcase tests the ability of the cpu controller to provide */ 28 /* fairness for share values (absolute). */ 29 /* */ 30 /* Total Tests: 2 */ 31 /* */ 32 /* Test 09: Heavy stress test with nice value change */ 33 /* Test 10: Heavy stress test (effect of heavy group on light group) */ 34 /* */ 35 /* Test Name: cpu_controller_test04 */ 36 /* */ 37 /* Test Assertion */ 38 /* Please refer to the file cpuctl_testplan.txt */ 39 /* */ 40 /* Author: Sudhir Kumar skumar (at) linux.vnet.ibm.com */ 41 /* */ 42 /* History: */ 43 /* Created- 20/12/2007 -Sudhir Kumar <skumar (at) linux.vnet.ibm.com> */ 44 /* */ 45 /******************************************************************************/ 46 47 #include <unistd.h> 48 #include <math.h> 49 #include <signal.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <sys/resource.h> 54 #include <sys/syscall.h> 55 #include <sys/time.h> 56 #include <sys/types.h> 57 #include <sys/stat.h> 58 #include <fcntl.h> 59 #include <time.h> 60 #include <unistd.h> 61 62 #include "../libcontrollers/libcontrollers.h" 63 #include "test.h" /* LTP harness APIs */ 64 65 #define TIME_INTERVAL 100 /* Time interval in seconds */ 66 #define NUM_INTERVALS 2 /* How many iterations of TIME_INTERVAL */ 67 68 char *TCID = "cpuctl_test04"; 69 int TST_TOTAL = 2; 70 pid_t scriptpid; 71 char path[] = "/dev/cpuctl"; 72 73 extern void cleanup() 74 { 75 kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */ 76 tst_exit(); /* Report exit status */ 77 } 78 79 volatile int timer_expired = 0; 80 81 int main(int argc, char *argv[]) 82 { 83 84 int test_num; 85 int task_num; 86 int len; 87 int num_cpus; /* Total time = TIME_INTERVAL *num_cpus in the machine */ 88 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX]; 89 char mysharesfile[FILENAME_MAX], ch; 90 /* Following variables are to capture parameters from script */ 91 char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p, *test_num_p, 92 *task_num_p; 93 gid_t mygroup_num; /* A number attached with a group */ 94 int fd; /* A descriptor to open a fifo for synchronized start */ 95 int counter = 0; /* To take n number of readings */ 96 double total_cpu_time, /* Accumulated cpu time */ 97 delta_cpu_time, /* Time the task could run on cpu(s) (in an interval) */ 98 prev_cpu_time = 0; 99 double exp_cpu_time; /* Expected time in % as obtained by shares calculation */ 100 struct rusage cpu_usage; 101 unsigned long int mygroup_shares; 102 time_t current_time, prev_time, delta_time; 103 unsigned int fmyshares, num_tasks; /* f-> from file. num_tasks is tasks in this group */ 104 struct sigaction newaction, oldaction; 105 106 mygroup_num = -1; 107 num_cpus = 0; 108 task_num = 0; 109 test_num = 0; 110 111 /* Signal handling for alarm */ 112 sigemptyset(&newaction.sa_mask); 113 newaction.sa_handler = signal_handler_alarm; 114 newaction.sa_flags = 0; 115 sigaction(SIGALRM, &newaction, &oldaction); 116 117 /* Collect the parameters passed by the script */ 118 group_num_p = getenv("GROUP_NUM"); 119 mygroup_p = getenv("MYGROUP"); 120 script_pid_p = getenv("SCRIPT_PID"); 121 num_cpus_p = getenv("NUM_CPUS"); 122 test_num_p = getenv("TEST_NUM"); 123 task_num_p = getenv("TASK_NUM"); 124 /* Check if all of them are valid */ 125 if ((test_num_p != NULL) 126 && (((test_num = atoi(test_num_p)) <= 10) 127 && ((test_num = atoi(test_num_p)) >= 9))) { 128 if ((group_num_p != NULL) && (mygroup_p != NULL) 129 && (script_pid_p != NULL) && (num_cpus_p != NULL) 130 && (task_num_p != NULL)) { 131 mygroup_num = atoi(group_num_p); 132 scriptpid = atoi(script_pid_p); 133 num_cpus = atoi(num_cpus_p); 134 task_num = atoi(task_num_p); 135 sprintf(mygroup, "%s", mygroup_p); 136 } else { 137 tst_brkm(TBROK, cleanup, 138 "Invalid other input parameters\n"); 139 } 140 } else { 141 tst_brkm(TBROK, cleanup, "Invalid test number passed\n"); 142 } 143 144 /* 145 * Let us give the default group 100 shares, as other groups will have 146 * a multiple of 100 shares. 147 * WARN: For large num of groups this may hit MAX_SHARES 148 */ 149 mygroup_shares = mygroup_num * 100; 150 151 sprintf(mytaskfile, "%s", mygroup); 152 strcat(mytaskfile, "/tasks"); 153 sprintf(mysharesfile, "%s", mygroup); 154 strcat(mysharesfile, "/cpu.shares"); 155 /* Need some technique so as only 1 task per grp writes to shares file */ 156 if (test_num == 9) 157 write_to_file(mysharesfile, "w", mygroup_shares); /* Write the shares of the group */ 158 159 write_to_file(mytaskfile, "a", getpid()); /* Assign the task to it's group */ 160 161 fd = open("./myfifo", 0); 162 if (fd == -1) { 163 tst_brkm(TBROK, cleanup, 164 "Could not open fifo for synchronization"); 165 } 166 167 read(fd, &ch, 1); /* To block all tasks here and fire them up at the same time */ 168 169 /* 170 * We now calculate the expected % cpu time of this task by getting 171 * it's group's shares, the total shares of all the groups and the 172 * number of tasks in this group. 173 */ 174 FLAG = 0; 175 total_shares = 0; 176 shares_pointer = &total_shares; 177 len = strlen(path); 178 if (!strncpy(fullpath, path, len)) 179 tst_brkm(TBROK, cleanup, "Could not copy directory path %s ", 180 path); 181 182 if (scan_shares_files(shares_pointer) != 0) 183 tst_brkm(TBROK, cleanup, 184 "From function scan_shares_files in %s ", fullpath); 185 186 /* return val: -1 in case of function error, else 2 is min share value */ 187 if ((fmyshares = read_shares_file(mysharesfile)) < 2) 188 tst_brkm(TBROK, cleanup, "in reading shares files %s ", 189 mysharesfile); 190 191 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0) 192 tst_brkm(TBROK, cleanup, "in reading tasks files %s ", 193 mytaskfile); 194 195 exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks); 196 197 prev_time = time(NULL); /* Note down the time */ 198 199 while (1) { 200 /* Need to run some cpu intensive task, which also frequently checks the timer value */ 201 double f = 274.345, mytime; /*just a float number to take sqrt */ 202 alarm(TIME_INTERVAL); 203 timer_expired = 0; 204 while (!timer_expired) /* Let the task run on cpu for TIME_INTERVAL */ 205 f = sqrt(f * f); /* Time of this operation should not be high otherwise we can 206 * exceed the TIME_INTERVAL to measure cpu usage 207 */ 208 current_time = time(NULL); 209 delta_time = current_time - prev_time; /* Duration in case its not exact TIME_INTERVAL */ 210 211 getrusage(0, &cpu_usage); 212 total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + /* user time */ 213 cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6); /* system time */ 214 delta_cpu_time = total_cpu_time - prev_cpu_time; 215 216 prev_cpu_time = total_cpu_time; 217 prev_time = current_time; 218 219 /* calculate % cpu time each task gets */ 220 if (delta_time > TIME_INTERVAL) 221 mytime = 222 (delta_cpu_time * 100) / (delta_time * num_cpus); 223 else 224 mytime = 225 (delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus); 226 227 fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)i.e. %6.2f(%%) exp:-%6.2f(%%)}\ 228 with %3u shares in %lu (s) INTERVAL\n", mygroup_num, task_num, delta_cpu_time, 229 mytime, exp_cpu_time, fmyshares, delta_time); 230 231 counter++; 232 233 if (counter >= NUM_INTERVALS) { /* Take n sets of readings for each shares value */ 234 switch (test_num) { 235 case 9: /* Test 09 */ 236 exit(0); /* This task is done with its job */ 237 break; 238 case 10: /* Test 10 */ 239 exit(0); /* This task is done with its job */ 240 break; 241 default: 242 tst_brkm(TBROK, cleanup, 243 "Invalid test number passed\n"); 244 break; 245 246 } /* end switch */ 247 } /* end if */ 248 } /* end while */ 249 } /* end main */ 250
