239 lines
9.1 KiB
C
239 lines
9.1 KiB
C
/******************************************************************************/
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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_task_def01.c */
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/* */
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/* Description: This is a c program that runs as a default task in a default */
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/* group to create an ideal scenario. In this default group all */
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/* the system tasks will be running along with this spinning task*/
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/* The file is to be used by tests 1-3. */
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/* */
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/* Total Tests: 1 */
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/* */
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/* Test Name: cpu_controller_tests */
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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- 14/11/2008 -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/time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.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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#ifdef DEBUG
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#define dbg(x...) printf(x);
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#else
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#define dbg(x...) do {} while (0)
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#endif
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#define TIME_INTERVAL 30 /* Time interval in seconds */
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#define NUM_INTERVALS 3 /* How many iterations of TIME_INTERVAL */
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#define NUM_SETS 4 /* How many share values (with same ratio) */
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#define MULTIPLIER 10 /* Rate at which share value gets multiplied */
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char *TCID = "cpu_controller_tests";
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int TST_TOTAL = 1;
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pid_t scriptpid;
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char path[FILENAME_MAX] = "/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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/* Report exit status */
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}
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int main(int argc, char *argv[])
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{
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int num_cpus, test_num, len; /* Total time = TIME_INTERVAL*num_cpus */
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char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
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char mysharesfile[FILENAME_MAX], ch;
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pid_t pid;
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int my_group_num; /* A number attached with a group */
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int fd; /* To open a fifo for synchronization */
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int first_counter = 0; /* To take n number of readings */
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int second_counter = 0; /* no of times shares have changed */
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double total_cpu_time; /* Accumulated cpu time */
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double delta_cpu_time; /* Time the task could run on cpu(s) */
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double prev_cpu_time = 0;
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double exp_cpu_time; /* Exp time in % 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 long int myshares = 2, baseshares = 1000;
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unsigned int fmyshares, num_tasks;
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struct sigaction newaction, oldaction;
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num_cpus = 0;
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test_num = 0;
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my_group_num = -1;
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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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/* Check if all parameters passed are correct */
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if ((argc < 5) || ((my_group_num = atoi(argv[1])) <= 0) ||
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((scriptpid = atoi(argv[3])) <= 0) ||
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((num_cpus = atoi(argv[4])) <= 0) ||
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(test_num = atoi(argv[5])) <= 0)
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tst_brkm(TBROK, cleanup, "Invalid input parameters");
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if (test_num == 1)
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myshares *= my_group_num;
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else if (test_num == 3)
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myshares = baseshares;
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else
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tst_brkm(TBROK, cleanup, "Wrong Test num passed. Exiting.");
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sprintf(mygroup, "%s", argv[2]);
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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 task to it's group */
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write_to_file(mysharesfile, "w", myshares);
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dbg("Default task's initial shares = %u", myshares);
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fd = SAFE_OPEN(cleanup, "./myfifo", 0);
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read(fd, &ch, 1); /* To fire all the tasks up at the same time */
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/*
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* We need not calculate the expected % cpu time of this task, as
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* neither it is required nor it can be predicted as there are idle
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* system tasks (and others too) 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,
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"Could not copy directory path %s ", 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,
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"in reading shares files %s ", mysharesfile);
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if ((read_file(mytaskfile, GET_TASKS, &num_tasks)) < 0)
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tst_brkm(TBROK, cleanup,
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"in reading tasks files %s ", 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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/*
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* Need to run some cpu intensive task, which also
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* frequently checks the timer value
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*/
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double f = 274.345, mytime; /*just a float number for sqrt */
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alarm(TIME_INTERVAL);
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timer_expired = 0;
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/*
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* Let the task run on cpu for TIME_INTERVAL. Time of this
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* operation should not be high otherwise we can exceed the
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* TIME_INTERVAL to measure cpu usage
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*/
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while (!timer_expired)
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f = sqrt(f * f);
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current_time = time(NULL);
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/* Duration in case its not exact TIME_INTERVAL */
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delta_time = current_time - prev_time;
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getrusage(0, &cpu_usage);
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/* total_cpu_time = total user time + total sys time */
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total_cpu_time = (cpu_usage.ru_utime.tv_sec +
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cpu_usage.ru_utime.tv_usec * 1e-6 +
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cpu_usage.ru_stime.tv_sec +
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cpu_usage.ru_stime.tv_usec * 1e-6);
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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 = (delta_cpu_time * 100) /
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(delta_time * num_cpus);
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else
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mytime = (delta_cpu_time * 100) /
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(TIME_INTERVAL * num_cpus);
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/*
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* Lets print the results. The exp cpu time calculated may not
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* be correct due to running system tasks at the moment
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*/
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fprintf(stdout, "DEF TASK:CPU TIME{calc:-%6.2f(s)"
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" i.e. %6.2f(%%) exp:-%6.2f(%%)} with %lu(shares)"
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" in %lu (s) INTERVAL\n", delta_cpu_time, mytime,
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exp_cpu_time, myshares, delta_time);
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first_counter++;
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/* Take n sets of readings for each shares value */
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if (first_counter >= NUM_INTERVALS) {
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first_counter = 0;
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second_counter++;
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if (second_counter >= NUM_SETS)
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exit(0); /* This task is done */
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/* Keep same ratio but change values */
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if (test_num == 1) {
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myshares = MULTIPLIER * myshares;
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write_to_file(mysharesfile, "w", myshares);
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}
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/* No need to change shares for def task for test 3 */
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} /* end if */
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} /* end while */
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} /* end main */
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