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 #include "safe_macros.h"
65
66 #define TIME_INTERVAL 100 /* Time interval in seconds */
67 #define NUM_INTERVALS 2 /* How many iterations of TIME_INTERVAL */
68
69 char *TCID = "cpuctl_test04";
70 int TST_TOTAL = 2;
71 pid_t scriptpid;
72 char path[] = "/dev/cpuctl";
73
cleanup(void)74 extern void cleanup(void)
75 {
76 kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */
77 tst_exit(); /* Report exit status */
78 }
79
main(void)80 int main(void)
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 gid_t mygroup_num; /* A number attached with a group */
93 int fd; /* A descriptor to open a fifo for synchronized start */
94 int counter = 0; /* To take n number of readings */
95 double total_cpu_time, /* Accumulated cpu time */
96 delta_cpu_time, /* Time the task could run on cpu(s) (in an interval) */
97 prev_cpu_time = 0;
98 double exp_cpu_time; /* Expected time in % as obtained by shares calculation */
99 struct rusage cpu_usage;
100 unsigned long int mygroup_shares;
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)) <= 10)
126 && ((test_num = atoi(test_num_p)) >= 9))) {
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");
138 }
139 } else {
140 tst_brkm(TBROK, cleanup, "Invalid test number passed");
141 }
142
143 /*
144 * Let us give the default group 100 shares, as other groups will have
145 * a multiple of 100 shares.
146 * WARN: For large num of groups this may hit MAX_SHARES
147 */
148 mygroup_shares = mygroup_num * 100;
149
150 sprintf(mytaskfile, "%s", mygroup);
151 strcat(mytaskfile, "/tasks");
152 sprintf(mysharesfile, "%s", mygroup);
153 strcat(mysharesfile, "/cpu.shares");
154 /* Need some technique so as only 1 task per grp writes to shares file */
155 if (test_num == 9)
156 write_to_file(mysharesfile, "w", mygroup_shares); /* Write the shares of the group */
157
158 write_to_file(mytaskfile, "a", getpid()); /* Assign the task to it's group */
159
160 fd = SAFE_OPEN(cleanup, "./myfifo", 0);
161
162 read(fd, &ch, 1); /* To block all tasks here and fire them up at the same time */
163
164 /*
165 * We now calculate the expected % cpu time of this task by getting
166 * it's group's shares, the total shares of all the groups and the
167 * number of tasks in this group.
168 */
169 FLAG = 0;
170 total_shares = 0;
171 shares_pointer = &total_shares;
172 len = strlen(path);
173 if (!strncpy(fullpath, path, len))
174 tst_brkm(TBROK, cleanup, "Could not copy directory path %s ",
175 path);
176
177 if (scan_shares_files(shares_pointer) != 0)
178 tst_brkm(TBROK, cleanup,
179 "From function scan_shares_files in %s ", fullpath);
180
181 /* return val: -1 in case of function error, else 2 is min share value */
182 if ((fmyshares = read_shares_file(mysharesfile)) < 2)
183 tst_brkm(TBROK, cleanup, "in reading shares files %s ",
184 mysharesfile);
185
186 if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
187 tst_brkm(TBROK, cleanup, "in reading tasks files %s ",
188 mytaskfile);
189
190 exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
191
192 prev_time = time(NULL); /* Note down the time */
193
194 while (1) {
195 /* Need to run some cpu intensive task, which also frequently checks the timer value */
196 double f = 274.345, mytime; /*just a float number to take sqrt */
197 alarm(TIME_INTERVAL);
198 timer_expired = 0;
199 while (!timer_expired) /* Let the task run on cpu for TIME_INTERVAL */
200 f = sqrt(f * f); /* Time of this operation should not be high otherwise we can
201 * exceed the TIME_INTERVAL to measure cpu usage
202 */
203 current_time = time(NULL);
204 delta_time = current_time - prev_time; /* Duration in case its not exact TIME_INTERVAL */
205
206 getrusage(0, &cpu_usage);
207 total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + /* user time */
208 cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6); /* system time */
209 delta_cpu_time = total_cpu_time - prev_cpu_time;
210
211 prev_cpu_time = total_cpu_time;
212 prev_time = current_time;
213
214 /* calculate % cpu time each task gets */
215 if (delta_time > TIME_INTERVAL)
216 mytime =
217 (delta_cpu_time * 100) / (delta_time * num_cpus);
218 else
219 mytime =
220 (delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus);
221
222 fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)i.e. %6.2f(%%) exp:-%6.2f(%%)}\
223 with %3u shares in %lu (s) INTERVAL\n", mygroup_num, task_num, delta_cpu_time,
224 mytime, exp_cpu_time, fmyshares, delta_time);
225
226 counter++;
227
228 if (counter >= NUM_INTERVALS) { /* Take n sets of readings for each shares value */
229 switch (test_num) {
230 case 9: /* Test 09 */
231 exit(0); /* This task is done with its job */
232 break;
233 case 10: /* Test 10 */
234 exit(0); /* This task is done with its job */
235 break;
236 default:
237 tst_brkm(TBROK, cleanup,
238 "Invalid test number passed");
239 break;
240
241 } /* end switch */
242 } /* end if */
243 } /* end while */
244 } /* end main */
245