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@linux.vnet.ibm.com */
41 /* */
42 /* History: */
43 /* Created- 20/12/2007 -Sudhir Kumar <skumar@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
cleanup()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
main(int argc,char * argv[])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