/******************************************************************************/ /* */ /* Copyright (c) International Business Machines Corp., 2007 */ /* */ /* This program is free software; you can redistribute it and/or modify */ /* it under the terms of the GNU General Public License as published by */ /* the Free Software Foundation; either version 2 of the License, or */ /* (at your option) any later version. */ /* */ /* This program is distributed in the hope that it will be useful, */ /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */ /* the GNU General Public License for more details. */ /* */ /* You should have received a copy of the GNU General Public License */ /* along with this program; if not, write to the Free Software */ /* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* */ /******************************************************************************/ /******************************************************************************/ /* */ /* File: cpuctl_test04.c */ /* */ /* Description: This is a c program that tests the cpucontroller fairness of */ /* scheduling the tasks according to their group shares. This */ /* testcase tests the ability of the cpu controller to provide */ /* fairness for share values (absolute). */ /* */ /* Total Tests: 2 */ /* */ /* Test 09: Heavy stress test with nice value change */ /* Test 10: Heavy stress test (effect of heavy group on light group) */ /* */ /* Test Name: cpu_controller_test04 */ /* */ /* Test Assertion */ /* Please refer to the file cpuctl_testplan.txt */ /* */ /* Author: Sudhir Kumar skumar@linux.vnet.ibm.com */ /* */ /* History: */ /* Created- 20/12/2007 -Sudhir Kumar */ /* */ /******************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "../libcontrollers/libcontrollers.h" #include "test.h" /* LTP harness APIs */ #include "safe_macros.h" #define TIME_INTERVAL 100 /* Time interval in seconds */ #define NUM_INTERVALS 2 /* How many iterations of TIME_INTERVAL */ char *TCID = "cpuctl_test04"; int TST_TOTAL = 2; pid_t scriptpid; char path[] = "/dev/cpuctl"; extern void cleanup(void) { kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */ tst_exit(); /* Report exit status */ } int main(void) { int test_num; int task_num; int len; int num_cpus; /* Total time = TIME_INTERVAL *num_cpus in the machine */ char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX]; char mysharesfile[FILENAME_MAX], ch; /* Following variables are to capture parameters from script */ char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p, *test_num_p, *task_num_p; gid_t mygroup_num; /* A number attached with a group */ int fd; /* A descriptor to open a fifo for synchronized start */ int counter = 0; /* To take n number of readings */ double total_cpu_time, /* Accumulated cpu time */ delta_cpu_time, /* Time the task could run on cpu(s) (in an interval) */ prev_cpu_time = 0; double exp_cpu_time; /* Expected time in % as obtained by shares calculation */ struct rusage cpu_usage; unsigned long int mygroup_shares; time_t current_time, prev_time, delta_time; unsigned int fmyshares, num_tasks; /* f-> from file. num_tasks is tasks in this group */ struct sigaction newaction, oldaction; mygroup_num = -1; num_cpus = 0; task_num = 0; test_num = 0; /* Signal handling for alarm */ sigemptyset(&newaction.sa_mask); newaction.sa_handler = signal_handler_alarm; newaction.sa_flags = 0; sigaction(SIGALRM, &newaction, &oldaction); /* Collect the parameters passed by the script */ group_num_p = getenv("GROUP_NUM"); mygroup_p = getenv("MYGROUP"); script_pid_p = getenv("SCRIPT_PID"); num_cpus_p = getenv("NUM_CPUS"); test_num_p = getenv("TEST_NUM"); task_num_p = getenv("TASK_NUM"); /* Check if all of them are valid */ if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) <= 10) && ((test_num = atoi(test_num_p)) >= 9))) { if ((group_num_p != NULL) && (mygroup_p != NULL) && (script_pid_p != NULL) && (num_cpus_p != NULL) && (task_num_p != NULL)) { mygroup_num = atoi(group_num_p); scriptpid = atoi(script_pid_p); num_cpus = atoi(num_cpus_p); task_num = atoi(task_num_p); sprintf(mygroup, "%s", mygroup_p); } else { tst_brkm(TBROK, cleanup, "Invalid other input parameters"); } } else { tst_brkm(TBROK, cleanup, "Invalid test number passed"); } /* * Let us give the default group 100 shares, as other groups will have * a multiple of 100 shares. * WARN: For large num of groups this may hit MAX_SHARES */ mygroup_shares = mygroup_num * 100; sprintf(mytaskfile, "%s", mygroup); strcat(mytaskfile, "/tasks"); sprintf(mysharesfile, "%s", mygroup); strcat(mysharesfile, "/cpu.shares"); /* Need some technique so as only 1 task per grp writes to shares file */ if (test_num == 9) write_to_file(mysharesfile, "w", mygroup_shares); /* Write the shares of the group */ write_to_file(mytaskfile, "a", getpid()); /* Assign the task to it's group */ fd = SAFE_OPEN(cleanup, "./myfifo", 0); read(fd, &ch, 1); /* To block all tasks here and fire them up at the same time */ /* * We now calculate the expected % cpu time of this task by getting * it's group's shares, the total shares of all the groups and the * number of tasks in this group. */ FLAG = 0; total_shares = 0; shares_pointer = &total_shares; len = strlen(path); if (!strncpy(fullpath, path, len)) tst_brkm(TBROK, cleanup, "Could not copy directory path %s ", path); if (scan_shares_files(shares_pointer) != 0) tst_brkm(TBROK, cleanup, "From function scan_shares_files in %s ", fullpath); /* return val: -1 in case of function error, else 2 is min share value */ if ((fmyshares = read_shares_file(mysharesfile)) < 2) tst_brkm(TBROK, cleanup, "in reading shares files %s ", mysharesfile); if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0) tst_brkm(TBROK, cleanup, "in reading tasks files %s ", mytaskfile); exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks); prev_time = time(NULL); /* Note down the time */ while (1) { /* Need to run some cpu intensive task, which also frequently checks the timer value */ double f = 274.345, mytime; /*just a float number to take sqrt */ alarm(TIME_INTERVAL); timer_expired = 0; while (!timer_expired) /* Let the task run on cpu for TIME_INTERVAL */ f = sqrt(f * f); /* Time of this operation should not be high otherwise we can * exceed the TIME_INTERVAL to measure cpu usage */ current_time = time(NULL); delta_time = current_time - prev_time; /* Duration in case its not exact TIME_INTERVAL */ getrusage(0, &cpu_usage); total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + /* user time */ cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6); /* system time */ delta_cpu_time = total_cpu_time - prev_cpu_time; prev_cpu_time = total_cpu_time; prev_time = current_time; /* calculate % cpu time each task gets */ if (delta_time > TIME_INTERVAL) mytime = (delta_cpu_time * 100) / (delta_time * num_cpus); else mytime = (delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus); fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)i.e. %6.2f(%%) exp:-%6.2f(%%)}\ with %3u shares in %lu (s) INTERVAL\n", mygroup_num, task_num, delta_cpu_time, mytime, exp_cpu_time, fmyshares, delta_time); counter++; if (counter >= NUM_INTERVALS) { /* Take n sets of readings for each shares value */ switch (test_num) { case 9: /* Test 09 */ exit(0); /* This task is done with its job */ break; case 10: /* Test 10 */ exit(0); /* This task is done with its job */ break; default: tst_brkm(TBROK, cleanup, "Invalid test number passed"); break; } /* end switch */ } /* end if */ } /* end while */ } /* end main */