cpuctl_test03.c revision b6ff02cd9592e40c4b435ff7755cb69572a23f47 
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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/* Standard Include Files */
49#include <unistd.h>
50#include <math.h>
51#include <signal.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <sys/resource.h>
56#include <sys/syscall.h>
57#include <sys/stat.h>
58#include <fcntl.h>
59#include <sys/time.h>
60#include <sys/types.h>
61#include <time.h>
62#include <unistd.h>
63
64#include "../libcontrollers/libcontrollers.h"
65#include "test.h"		/* LTP harness APIs*/
66
67#define TIME_INTERVAL	30	/* Time interval in seconds*/
68#define NUM_INTERVALS	2       /* How many iterations of TIME_INTERVAL */
69
70char *TCID = "cpu_controller_test06";
71int TST_TOTAL = 3;
72pid_t scriptpid;
73char path[] = "/dev/cpuctl";
74extern void
75cleanup()
76{
77	kill (scriptpid, SIGUSR1);/* Inform the shell to do cleanup*/
78	tst_exit ();		  /* Report exit status*/
79}
80
81volatile int timer_expired = 0;
82
83int main(int argc, char* argv[])
84{
85
86	int test_num;
87	int task_num;
88	int len;
89	int num_cpus;	/* Total time = TIME_INTERVAL *num_cpus in the machine */
90	char mygroup[FILENAME_MAX], mytaskfile[FILENAME_MAX];
91	char mysharesfile[FILENAME_MAX], ch;
92	/* Following variables are to capture parameters from script*/
93	char *group_num_p, *mygroup_p, *script_pid_p, *num_cpus_p, *test_num_p, *task_num_p;
94	pid_t pid;
95	int mygroup_num,	        /* A number attached with a group*/
96		fd,          	        /* A descriptor to open a fifo for synchronized start*/
97		counter =0; 	 	/* To take n number of readings*/
98	double total_cpu_time,  	/* Accumulated cpu time*/
99		delta_cpu_time,  	/* Time the task could run on cpu(s) (in an interval)*/
100		prev_cpu_time=0;
101	double exp_cpu_time;            /* Expected time in % as obtained by shares calculation */
102	struct rusage cpu_usage;
103	time_t current_time, prev_time, delta_time;
104	unsigned int fmyshares, num_tasks;/* f-> from file. num_tasks is tasks in this group*/
105	struct sigaction newaction, oldaction;
106
107	mygroup_num = -1;
108	num_cpus = 0;
109	task_num = 0;
110	test_num = 0;
111
112	/* Signal handling for alarm*/
113	sigemptyset (&newaction.sa_mask);
114	newaction.sa_handler = signal_handler_alarm;
115	newaction.sa_flags=0;
116	sigaction (SIGALRM, &newaction, &oldaction);
117
118	/* Collect the parameters passed by the script */
119	group_num_p	= getenv("GROUP_NUM");
120	mygroup_p	= getenv("MYGROUP");
121	script_pid_p 	= getenv("SCRIPT_PID");
122	num_cpus_p 	= getenv("NUM_CPUS");
123	test_num_p 	= getenv("TEST_NUM");
124	task_num_p 	= getenv("TASK_NUM");
125	/* Check if all of them are valid */
126	if ((test_num_p != NULL) && (((test_num = atoi(test_num_p)) <= 8) && ((test_num =atoi(test_num_p)) >= 6)))
127	{
128		if ((group_num_p != NULL) && (mygroup_p != NULL) && \
129			(script_pid_p != NULL) && (num_cpus_p != NULL) && (task_num_p != NULL))
130		{
131			mygroup_num	 = atoi(group_num_p);
132			scriptpid	 = atoi(script_pid_p);
133			num_cpus	 = atoi (num_cpus_p);
134			task_num	 = atoi (task_num_p);
135			sprintf(mygroup,"%s", mygroup_p);
136		}
137		else
138		{
139			tst_brkm (TBROK, cleanup, "Invalid other input parameters\n");
140		}
141	}
142	else
143	{
144		tst_brkm (TBROK, cleanup, "Invalid test number passed\n");
145	}
146
147	sprintf(mytaskfile, "%s", mygroup);
148	sprintf(mysharesfile, "%s", mygroup);
149	strcat (mytaskfile,"/tasks");
150	strcat (mysharesfile,"/cpu.shares");
151	pid = getpid();
152	write_to_file (mytaskfile, "a", pid);    /* Assign the task to it's group*/
153
154	fd = open ("./myfifo", 0);
155	if (fd == -1)
156	{
157		tst_brkm (TBROK, cleanup, "Could not open fifo for synchronization");
158	}
159
160	read (fd, &ch, 1);	         /* To block all tasks here and fire them up at the same time*/
161
162	/*
163	 * We now calculate the expected % cpu time of this task by getting
164	 * it's group's shares, the total shares of all the groups and the
165	 * number of tasks in this group.
166	 */
167	FLAG = 0;
168	total_shares = 0;
169	shares_pointer = &total_shares;
170	len = strlen (path);
171	if (!strncpy (fullpath, path, len))
172		tst_brkm (TBROK, cleanup, "Could not copy directory path %s ", path);
173
174	if (scan_shares_files(shares_pointer) != 0)
175		tst_brkm (TBROK, cleanup, "From function scan_shares_files in %s ", fullpath);
176
177	/* return val: -1 in case of function error, else 2 is min share value */
178	if ((fmyshares = read_shares_file(mysharesfile)) < 2)
179		tst_brkm (TBROK, cleanup, "in reading shares files  %s ", mysharesfile);
180
181	if ((read_file (mytaskfile, GET_TASKS, &num_tasks)) < 0)
182		tst_brkm (TBROK, cleanup, "in reading tasks files  %s ", mytaskfile);
183
184	exp_cpu_time = (double)(fmyshares * 100) /(total_shares * num_tasks);
185
186	prev_time = time (NULL);	 /* Note down the time*/
187
188	while (1)
189	{
190		/* Need to run some cpu intensive task, which also frequently checks the timer value*/
191		double f = 274.345, mytime;	/*just a float number to take sqrt*/
192		alarm (TIME_INTERVAL);
193		timer_expired = 0;
194		while (!timer_expired)	/* Let the task run on cpu for TIME_INTERVAL*/
195			f = sqrt (f*f); /* Time of this operation should not be high otherwise we can
196					 * exceed the TIME_INTERVAL to measure cpu usage
197					 */
198		current_time = time (NULL);
199		delta_time = current_time - prev_time;	/* Duration in case its not exact TIME_INTERVAL*/
200
201		getrusage (0, &cpu_usage);
202		total_cpu_time = (cpu_usage.ru_utime.tv_sec + cpu_usage.ru_utime.tv_usec * 1e-6 + /* user time*/
203				cpu_usage.ru_stime.tv_sec + cpu_usage.ru_stime.tv_usec * 1e-6) ;  /* system time*/
204		delta_cpu_time = total_cpu_time - prev_cpu_time;
205
206		prev_cpu_time = total_cpu_time;
207		prev_time = current_time;
208
209		/* calculate % cpu time each task gets */
210		if (delta_time > TIME_INTERVAL)
211			mytime =  (delta_cpu_time * 100) / (delta_time * num_cpus);
212		else
213			mytime =  (delta_cpu_time * 100) / (TIME_INTERVAL * num_cpus);
214
215                fprintf (stdout,"Grp:-%3d task-%3d:CPU TIME{calc:-%6.2f(s)i.e. %6.2f(%%) exp:-%6.2f(%%)}\
216 in %lu (s) INTERVAL\n",mygroup_num, task_num, delta_cpu_time, mytime,\
217exp_cpu_time, delta_time);
218
219		counter++;
220
221		if (counter >= NUM_INTERVALS)	 /* Take n sets of readings for each shares value*/
222		{
223		switch (test_num)
224			{
225			case 6:			/* Test 06 */
226			case 7:			/* Test 07 */
227			case 8:			/* Test 08 */
228				exit (0);		/* This task is done with its job*/
229				break;
230			default:
231				tst_brkm (TBROK, cleanup, "Invalid test number passed\n");
232				break;
233
234			}	/* end switch*/
235		}	/* end if*/
236        }	/* end while*/
237}	/* end main*/
238