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_test03.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 scheduling fairness with respect to number */ 28 /* of classes and number of jobs in each class */ 29 /* */ 30 /* Total Tests: 1 */ 31 /* */ 32 /* Test 6: N X M (N groups with M tasks each) */ 33 /* Test 7: N*M X 1 (N*M groups with 1 task each) */ 34 /* Test 8: 1 X N*M (1 group with N*M tasks each) */ 35 /* */ 36 /* Test Name: cpu_controller_test03 */ 37 /* */ 38 /* Test Assertion */ 39 /* Please refer to the file cpuctl_testplan.txt */ 40 /* */ 41 /* Author: Sudhir Kumar skumar (at) linux.vnet.ibm.com */ 42 /* */ 43 /* History: */ 44 /* Created- 20/12/2007 -Sudhir Kumar <skumar (at) linux.vnet.ibm.com> */ 45 /* */ 46 /******************************************************************************/ 47 48 #include <unistd.h> 49 #include <math.h> 50 #include <signal.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <sys/resource.h> 55 #include <sys/syscall.h> 56 #include <sys/stat.h> 57 #include <fcntl.h> 58 #include <sys/time.h> 59 #include <sys/types.h> 60 #include <time.h> 61 62 #include "../libcontrollers/libcontrollers.h" 63 #include "test.h" /* LTP harness APIs */ 64 65 #define TIME_INTERVAL 30 /* Time interval in seconds */ 66 #define NUM_INTERVALS 2 /* How many iterations of TIME_INTERVAL */ 67 68 char *TCID = "cpuctl_test03"; 69 int TST_TOTAL = 3; 70 pid_t scriptpid; 71 char path[] = "/dev/cpuctl"; 72 extern void cleanup(void) 73 { 74 kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */ 75 tst_exit(); /* Report exit status */ 76 } 77 78 volatile int timer_expired = 0; 79 80 int main(int argc, char *argv[]) 81 { 82 83 int test_num; 84 int task_num; 85 int len; 86 int num_cpus; /* Total time = TIME_INTERVAL *num_cpus in the machine */ 87 char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX]; 88 char mysharesfile[FILENAME_MAX], ch; 89 /* Following variables are to capture parameters from script */ 90 char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p, *test_num_p, 91 *task_num_p; 92 pid_t pid; 93 int mygroup_num, /* A number attached with a group */ 94 fd, /* A descriptor to open a fifo for synchronized start */ 95 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 time_t current_time, prev_time, delta_time; 102 unsigned int fmyshares, num_tasks; /* f-> from file. num_tasks is tasks in this group */ 103 struct sigaction newaction, oldaction; 104 105 mygroup_num = -1; 106 num_cpus = 0; 107 task_num = 0; 108 test_num = 0; 109 110 /* Signal handling for alarm */ 111 sigemptyset(&newaction.sa_mask); 112 newaction.sa_handler = signal_handler_alarm; 113 newaction.sa_flags = 0; 114 sigaction(SIGALRM, &newaction, &oldaction); 115 116 /* Collect the parameters passed by the script */ 117 group_num_p = getenv("GROUP_NUM"); 118 mygroup_p = getenv("MYGROUP"); 119 script_pid_p = getenv("SCRIPT_PID"); 120 num_cpus_p = getenv("NUM_CPUS"); 121 test_num_p = getenv("TEST_NUM"); 122 task_num_p = getenv("TASK_NUM"); 123 /* Check if all of them are valid */ 124 if ((test_num_p != NULL) 125 && (((test_num = atoi(test_num_p)) <= 8) 126 && ((test_num = atoi(test_num_p)) >= 6))) { 127 if ((group_num_p != NULL) && (mygroup_p != NULL) 128 && (script_pid_p != NULL) && (num_cpus_p != NULL) 129 && (task_num_p != NULL)) { 130 mygroup_num = atoi(group_num_p); 131 scriptpid = atoi(script_pid_p); 132 num_cpus = atoi(num_cpus_p); 133 task_num = atoi(task_num_p); 134 sprintf(mygroup, "%s", mygroup_p); 135 } else { 136 tst_brkm(TBROK, cleanup, 137 "Invalid other input parameters\n"); 138 } 139 } else { 140 tst_brkm(TBROK, cleanup, "Invalid test number passed\n"); 141 } 142 143 sprintf(mytaskfile, "%s", mygroup); 144 sprintf(mysharesfile, "%s", mygroup); 145 strcat(mytaskfile, "/tasks"); 146 strcat(mysharesfile, "/cpu.shares"); 147 pid = getpid(); 148 write_to_file(mytaskfile, "a", pid); /* Assign the task to it's group */ 149 150 fd = open("./myfifo", 0); 151 if (fd == -1) { 152 tst_brkm(TBROK, cleanup, 153 "Could not open fifo for synchronization"); 154 } 155 156 read(fd, &ch, 1); /* To block all tasks here and fire them up at the same time */ 157 158 /* 159 * We now calculate the expected % cpu time of this task by getting 160 * it's group's shares, the total shares of all the groups and the 161 * number of tasks in this group. 162 */ 163 FLAG = 0; 164 total_shares = 0; 165 shares_pointer = &total_shares; 166 len = strlen(path); 167 if (!strncpy(fullpath, path, len)) 168 tst_brkm(TBROK, cleanup, "Could not copy directory path %s ", 169 path); 170 171 if (scan_shares_files(shares_pointer) != 0) 172 tst_brkm(TBROK, cleanup, 173 "From function scan_shares_files in %s ", fullpath); 174 175 /* return val: -1 in case of function error, else 2 is min share value */ 176 if ((fmyshares = read_shares_file(mysharesfile)) < 2) 177 tst_brkm(TBROK, cleanup, "in reading shares files %s ", 178 mysharesfile); 179 180 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0) 181 tst_brkm(TBROK, cleanup, "in reading tasks files %s ", 182 mytaskfile); 183 184 exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks); 185 186 prev_time = time(NULL); /* Note down the time */ 187 188 while (1) { 189 /* Need to run some cpu intensive task, which also frequently checks the timer value */ 190 double f = 274.345, mytime; /*just a float number to take sqrt */ 191 alarm(TIME_INTERVAL); 192 timer_expired = 0; 193 while (!timer_expired) /* Let the task run on cpu for TIME_INTERVAL */ 194 f = sqrt(f * f); /* Time of this operation should not be high otherwise we can 195 * exceed the TIME_INTERVAL to measure cpu usage 196 */ 197 current_time = time(NULL); 198 delta_time = current_time - prev_time; /* Duration in case its not exact TIME_INTERVAL */ 199 200 getrusage(0, &cpu_usage); 201 total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + /* user time */ 202 cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6); /* system time */ 203 delta_cpu_time = total_cpu_time - prev_cpu_time; 204 205 prev_cpu_time = total_cpu_time; 206 prev_time = current_time; 207 208 /* calculate % cpu time each task gets */ 209 if (delta_time > TIME_INTERVAL) 210 mytime = 211 (delta_cpu_time * 100) / (delta_time * num_cpus); 212 else 213 mytime = 214 (delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus); 215 216 fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)i.e. %6.2f(%%) exp:-%6.2f(%%)}\ 217 in %lu (s) INTERVAL\n", mygroup_num, task_num, delta_cpu_time, mytime, 218 exp_cpu_time, delta_time); 219 220 counter++; 221 222 if (counter >= NUM_INTERVALS) { /* Take n sets of readings for each shares value */ 223 switch (test_num) { 224 case 6: /* Test 06 */ 225 case 7: /* Test 07 */ 226 case 8: /* Test 08 */ 227 exit(0); /* This task is done with its job */ 228 break; 229 default: 230 tst_brkm(TBROK, cleanup, 231 "Invalid test number passed\n"); 232 break; 233 234 } /* end switch */ 235 } /* end if */ 236 } /* end while */ 237 } /* end main */ 238
