/******************************************************************************/ /* */ /* 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_task_def01.c */ /* */ /* Description: This is a c program that runs as a default task in a default */ /* group to create an ideal scenario. In this default group all */ /* the system tasks will be running along with this spinning task*/ /* The file is to be used by tests 1-3. */ /* */ /* Total Tests: 1 */ /* */ /* Test Name: cpu_controller_tests */ /* */ /* Test Assertion */ /* Please refer to the file cpuctl_testplan.txt */ /* */ /* Author: Sudhir Kumar skumar@linux.vnet.ibm.com */ /* */ /* History: */ /* Created- 14/11/2008 -Sudhir Kumar */ /* */ /******************************************************************************/ #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" #ifdef DEBUG #define dbg(x...) printf(x); #else #define dbg(x...) do {} while (0) #endif #define TIME_INTERVAL 30 /* Time interval in seconds */ #define NUM_INTERVALS 3 /* How many iterations of TIME_INTERVAL */ #define NUM_SETS 4 /* How many share values (with same ratio) */ #define MULTIPLIER 10 /* Rate at which share value gets multiplied */ char *TCID = "cpu_controller_tests"; int TST_TOTAL = 1; pid_t scriptpid; char path[FILENAME_MAX] = "/dev/cpuctl"; extern void cleanup(void) { kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */ /* Report exit status */ } int main(int argc, char *argv[]) { int num_cpus, test_num, len; /* Total time = TIME_INTERVAL*num_cpus */ char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX]; char mysharesfile[FILENAME_MAX], ch; pid_t pid; int my_group_num; /* A number attached with a group */ int fd; /* To open a fifo for synchronization */ int first_counter = 0; /* To take n number of readings */ int second_counter = 0; /* no of times shares have changed */ double total_cpu_time; /* Accumulated cpu time */ double delta_cpu_time; /* Time the task could run on cpu(s) */ double prev_cpu_time = 0; double exp_cpu_time; /* Exp time in % by shares calculation */ struct rusage cpu_usage; time_t current_time, prev_time, delta_time; unsigned long int myshares = 2, baseshares = 1000; unsigned int fmyshares, num_tasks; struct sigaction newaction, oldaction; num_cpus = 0; test_num = 0; my_group_num = -1; /* Signal handling for alarm */ sigemptyset(&newaction.sa_mask); newaction.sa_handler = signal_handler_alarm; newaction.sa_flags = 0; sigaction(SIGALRM, &newaction, &oldaction); /* Check if all parameters passed are correct */ if ((argc < 5) || ((my_group_num = atoi(argv[1])) <= 0) || ((scriptpid = atoi(argv[3])) <= 0) || ((num_cpus = atoi(argv[4])) <= 0) || (test_num = atoi(argv[5])) <= 0) tst_brkm(TBROK, cleanup, "Invalid input parameters\n"); if (test_num == 1) myshares *= my_group_num; else if (test_num == 3) myshares = baseshares; else tst_brkm(TBROK, cleanup, "Wrong Test num passed. Exiting.\n"); sprintf(mygroup, "%s", argv[2]); sprintf(mytaskfile, "%s", mygroup); sprintf(mysharesfile, "%s", mygroup); strcat(mytaskfile, "/tasks"); strcat(mysharesfile, "/cpu.shares"); pid = getpid(); write_to_file(mytaskfile, "a", pid); /* Assign task to it's group */ write_to_file(mysharesfile, "w", myshares); dbg("Default task's initial shares = %u", myshares); fd = SAFE_OPEN(cleanup, "./myfifo", 0); read(fd, &ch, 1); /* To fire all the tasks up at the same time */ /* * We need not calculate the expected % cpu time of this task, as * neither it is required nor it can be predicted as there are idle * system tasks (and others too) 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 for sqrt */ alarm(TIME_INTERVAL); timer_expired = 0; /* * Let the task run on cpu for TIME_INTERVAL. Time of this * operation should not be high otherwise we can exceed the * TIME_INTERVAL to measure cpu usage */ while (!timer_expired) f = sqrt(f * f); current_time = time(NULL); /* Duration in case its not exact TIME_INTERVAL */ delta_time = current_time - prev_time; getrusage(0, &cpu_usage); /* total_cpu_time = total user time + total sys time */ total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6); 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); /* * Lets print the results. The exp cpu time calculated may not * be correct due to running system tasks at the moment */ fprintf(stdout, "DEF TASK:CPU TIME{calc:-%6.2f(s)" " i.e. %6.2f(%%) exp:-%6.2f(%%)} with %lu(shares)" " in %lu (s) INTERVAL\n", delta_cpu_time, mytime, exp_cpu_time, myshares, delta_time); first_counter++; /* Take n sets of readings for each shares value */ if (first_counter >= NUM_INTERVALS) { first_counter = 0; second_counter++; if (second_counter >= NUM_SETS) exit(0); /* This task is done */ /* Keep same ratio but change values */ if (test_num == 1) { myshares = MULTIPLIER * myshares; write_to_file(mysharesfile, "w", myshares); } /* No need to change shares for def task for test 3 */ } /* end if */ } /* end while */ } /* end main */