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