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235 lines
9.4 KiB
235 lines
9.4 KiB
/******************************************************************************/
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/* */
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/* Copyright (c) International Business Machines Corp., 2007 */
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/* */
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/* This program is free software; you can redistribute it and/or modify */
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/* it under the terms of the GNU General Public License as published by */
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/* the Free Software Foundation; either version 2 of the License, or */
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/* (at your option) any later version. */
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/* */
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/* This program is distributed in the hope that it will be useful, */
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/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
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/* the GNU General Public License for more details. */
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/* */
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/* You should have received a copy of the GNU General Public License */
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/* along with this program; if not, write to the Free Software */
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/* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
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/* */
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/******************************************************************************/
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/******************************************************************************/
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/* */
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/* File: cpuctl_test03.c */
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/* */
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/* Description: This is a c program that tests the cpucontroller fairness of */
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/* scheduling the tasks according to their group shares. This */
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/* testcase tests the scheduling fairness with respect to number */
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/* of classes and number of jobs in each class */
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/* */
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/* Total Tests: 1 */
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/* */
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/* Test 6: N X M (N groups with M tasks each) */
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/* Test 7: N*M X 1 (N*M groups with 1 task each) */
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/* Test 8: 1 X N*M (1 group with N*M tasks each) */
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/* */
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/* Test Name: cpu_controller_test03 */
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/* */
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/* Test Assertion */
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/* Please refer to the file cpuctl_testplan.txt */
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/* */
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/* Author: Sudhir Kumar skumar@linux.vnet.ibm.com */
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/* */
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/* History: */
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/* Created- 20/12/2007 -Sudhir Kumar <skumar@linux.vnet.ibm.com> */
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/* */
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/******************************************************************************/
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#include <unistd.h>
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#include <math.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/resource.h>
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#include <sys/syscall.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <time.h>
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#include "../libcontrollers/libcontrollers.h"
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#include "test.h" /* LTP harness APIs */
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#include "safe_macros.h"
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#define TIME_INTERVAL 30 /* Time interval in seconds */
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#define NUM_INTERVALS 2 /* How many iterations of TIME_INTERVAL */
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char *TCID = "cpuctl_test03";
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int TST_TOTAL = 3;
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pid_t scriptpid;
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char path[] = "/dev/cpuctl";
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extern void cleanup(void)
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{
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kill(scriptpid, SIGUSR1); /* Inform the shell to do cleanup */
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tst_exit(); /* Report exit status */
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}
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volatile int timer_expired = 0;
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int main(int argc, char *argv[])
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{
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int test_num;
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int task_num;
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int len;
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int num_cpus; /* Total time = TIME_INTERVAL *num_cpus in the machine */
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char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
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char mysharesfile[FILENAME_MAX], ch;
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/* Following variables are to capture parameters from script */
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char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p, *test_num_p,
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*task_num_p;
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pid_t pid;
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int mygroup_num, /* A number attached with a group */
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fd, /* A descriptor to open a fifo for synchronized start */
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counter = 0; /* To take n number of readings */
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double total_cpu_time, /* Accumulated cpu time */
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delta_cpu_time, /* Time the task could run on cpu(s) (in an interval) */
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prev_cpu_time = 0;
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double exp_cpu_time; /* Expected time in % as obtained by shares calculation */
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struct rusage cpu_usage;
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time_t current_time, prev_time, delta_time;
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unsigned int fmyshares, num_tasks; /* f-> from file. num_tasks is tasks in this group */
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struct sigaction newaction, oldaction;
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mygroup_num = -1;
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num_cpus = 0;
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task_num = 0;
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test_num = 0;
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/* Signal handling for alarm */
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sigemptyset(&newaction.sa_mask);
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newaction.sa_handler = signal_handler_alarm;
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newaction.sa_flags = 0;
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sigaction(SIGALRM, &newaction, &oldaction);
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/* Collect the parameters passed by the script */
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group_num_p = getenv("GROUP_NUM");
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mygroup_p = getenv("MYGROUP");
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script_pid_p = getenv("SCRIPT_PID");
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num_cpus_p = getenv("NUM_CPUS");
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test_num_p = getenv("TEST_NUM");
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task_num_p = getenv("TASK_NUM");
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/* Check if all of them are valid */
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if ((test_num_p != NULL)
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&& (((test_num = atoi(test_num_p)) <= 8)
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&& ((test_num = atoi(test_num_p)) >= 6))) {
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if ((group_num_p != NULL) && (mygroup_p != NULL)
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&& (script_pid_p != NULL) && (num_cpus_p != NULL)
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&& (task_num_p != NULL)) {
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mygroup_num = atoi(group_num_p);
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scriptpid = atoi(script_pid_p);
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num_cpus = atoi(num_cpus_p);
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task_num = atoi(task_num_p);
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sprintf(mygroup, "%s", mygroup_p);
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} else {
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tst_brkm(TBROK, cleanup,
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"Invalid other input parameters\n");
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}
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} else {
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tst_brkm(TBROK, cleanup, "Invalid test number passed\n");
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}
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sprintf(mytaskfile, "%s", mygroup);
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sprintf(mysharesfile, "%s", mygroup);
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strcat(mytaskfile, "/tasks");
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strcat(mysharesfile, "/cpu.shares");
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pid = getpid();
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write_to_file(mytaskfile, "a", pid); /* Assign the task to it's group */
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fd = SAFE_OPEN(cleanup, "./myfifo", 0);
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read(fd, &ch, 1); /* To block all tasks here and fire them up at the same time */
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/*
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* We now calculate the expected % cpu time of this task by getting
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* it's group's shares, the total shares of all the groups and the
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* number of tasks in this group.
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*/
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FLAG = 0;
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total_shares = 0;
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shares_pointer = &total_shares;
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len = strlen(path);
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if (!strncpy(fullpath, path, len))
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tst_brkm(TBROK, cleanup, "Could not copy directory path %s ",
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path);
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if (scan_shares_files(shares_pointer) != 0)
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tst_brkm(TBROK, cleanup,
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"From function scan_shares_files in %s ", fullpath);
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/* return val: -1 in case of function error, else 2 is min share value */
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if ((fmyshares = read_shares_file(mysharesfile)) < 2)
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tst_brkm(TBROK, cleanup, "in reading shares files %s ",
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mysharesfile);
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if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
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tst_brkm(TBROK, cleanup, "in reading tasks files %s ",
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mytaskfile);
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exp_cpu_time = (double)(fmyshares * 100) / (total_shares * num_tasks);
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prev_time = time(NULL); /* Note down the time */
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while (1) {
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/* Need to run some cpu intensive task, which also frequently checks the timer value */
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double f = 274.345, mytime; /*just a float number to take sqrt */
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alarm(TIME_INTERVAL);
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timer_expired = 0;
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while (!timer_expired) /* Let the task run on cpu for TIME_INTERVAL */
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f = sqrt(f * f); /* Time of this operation should not be high otherwise we can
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* exceed the TIME_INTERVAL to measure cpu usage
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*/
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current_time = time(NULL);
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delta_time = current_time - prev_time; /* Duration in case its not exact TIME_INTERVAL */
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getrusage(0, &cpu_usage);
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total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + /* user time */
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cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6); /* system time */
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delta_cpu_time = total_cpu_time - prev_cpu_time;
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prev_cpu_time = total_cpu_time;
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prev_time = current_time;
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/* calculate % cpu time each task gets */
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if (delta_time > TIME_INTERVAL)
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mytime =
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(delta_cpu_time * 100) / (delta_time * num_cpus);
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else
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mytime =
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(delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus);
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fprintf(stdout, "Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)i.e. %6.2f(%%) exp:-%6.2f(%%)}\
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in %lu (s) INTERVAL\n", mygroup_num, task_num, delta_cpu_time, mytime,
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exp_cpu_time, delta_time);
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counter++;
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if (counter >= NUM_INTERVALS) { /* Take n sets of readings for each shares value */
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switch (test_num) {
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case 6: /* Test 06 */
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case 7: /* Test 07 */
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case 8: /* Test 08 */
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exit(0); /* This task is done with its job */
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break;
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default:
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tst_brkm(TBROK, cleanup,
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"Invalid test number passed\n");
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break;
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} /* end switch */
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} /* end if */
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} /* end while */
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} /* end main */
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