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