/*
* Copyright (c) International Business Machines Corp., 2001
*
* 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
*/
/*
* FUNCTIONS: Scheduler Test Suite
*/
/*---------------------------------------------------------------------+
| sched_tc4 |
| ==================================================================== |
| |
| Description: Creates short-term disk I/O bound process |
| |
| Algorithm: o Set process priority |
| o Continuously multiply matrices together until |
| interrupted. |
| |
| To compile: cc -o sched_tc4 sched_tc4.c -L. -lpsc |
| |
| Usage: sched_tc4 [-t priority_type] [-p priority] |
| [-l log] [-v] [-d] |
| |
| Last update: Ver. 1.3, 4/10/94 23:05:02 |
| |
| Change Activity |
| |
| Version Date Name Reason |
| 0.1 050689 CTU Initial version |
| 0.2 010402 Manoj Iyer Ported to Linux |
| |
+---------------------------------------------------------------------*/
#include <sys/times.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include "sched.h"
/*
* Defines:
*
* USAGE: usage statement
*
* DEFAULT_PRIORITY_TYPE: default priority
*
* BLOCK_SIZE: block size (in bytes) for raw I/O
*
* TIMES: number of times to read raw I/O device (~25MB)
*
*/
#define DEFAULT_PRIORITY_TYPE "variable"
#define DEFAULT_LOGFILE "sched_tc4.log"
#define BLOCK_SIZE 512
#define TIMES 5000
#define USAGE "Usage: %s [-l log] [-t type] [-p priority] [-v] [-d]\n" \
" -l log log file \n" \
" -t type priority type 'variable' or 'fixed' \n" \
" -p priority priority value \n" \
" -v verbose \n" \
" -d enable debugging messages \n"
/*
* Function prototypes:
*
* process_file: reads data file
*
* parse_args: parse command line arguments
*/
void parse_args(int, char **);
void read_raw_device();
/*
* Global variables:
*
* verbose: enable normal messages
*
* debug: enable debugging messages
*
* priority: process type (fixed priority, variable priority)
*/
int verbose = 0;
int debug = 0;
int priority = DEFAULT_PRIORITY;
char *logfile = DEFAULT_LOGFILE;
char *priority_type = DEFAULT_PRIORITY_TYPE;
/*---------------------------------------------------------------------+
| main |
| ==================================================================== |
| |
| Function: ... |
| |
+---------------------------------------------------------------------*/
int main(int argc, char **argv)
{
FILE *statfile;
clock_t start_time; /* start & stop times */
clock_t stop_time;
float elapsed_time;
struct tms timer_info; /* time accounting info */
/*
* Process command line arguments...
*/
parse_args(argc, argv);
if (verbose)
printf("%s: Scheduler TestSuite program\n\n", *argv);
if (debug) {
printf("\tpriority type: %s\n", priority_type);
printf("\tpriority: %d\n", priority);
printf("\tlogfile: %s\n", logfile);
}
/*
* Adjust the priority of this process if the real time flag is set
*/
if (!strcmp(priority_type, "fixed")) {
#ifndef __linux__
if (setpri(0, DEFAULT_PRIORITY) < 0)
sys_error("setpri failed", __FILE__, __LINE__);
#else
if (setpriority(PRIO_PROCESS, 0, 0) < 0)
sys_error("setpri failed", __FILE__, __LINE__);
#endif
} else {
if (nice((priority - 50) - (nice(0) + 20)) < 0 && errno != 0)
sys_error("nice failed", __FILE__, __LINE__);
}
/*
* Read from raw I/O device and record elapsed time...
*/
start_time = time((time_t *) & timer_info);
read_raw_device();
stop_time = time((time_t *) & timer_info);
elapsed_time = (float)(stop_time - start_time) / 100.0;
if ((statfile = fopen(logfile, "w")) == NULL)
sys_error("fopen failed", __FILE__, __LINE__);
fprintf(statfile, "%f\n", elapsed_time);
if (debug)
printf("\n\telapsed time: %f\n", elapsed_time);
if (fclose(statfile) < 0)
sys_error("fclose failed", __FILE__, __LINE__);
/*
* Exit with success!
*/
if (verbose)
printf("\nsuccessful!\n");
return (0);
}
/*---------------------------------------------------------------------+
| read_raw_device () |
| ==================================================================== |
| |
| Function: o opens raw disk device |
| o reads block of size BLOCK_SIZE n times |
| o lseeks back to beginning of file |
| o closes raw device |
| |
+---------------------------------------------------------------------*/
void read_raw_device()
{
char readbuf[BLOCK_SIZE + 1]; /* buffer to store bytes read */
int fd; /* file descriptor */
int i; /* loop counter */
int blocks = 0; /* number of blocks read */
#ifndef __linux__
char raw_dev[50] = "/dev/hd2"; /* name of raw device file */
#else
char *raw_dev; /* name of raw device file */
if ((raw_dev = getenv("RAWDEV")) == NULL) {
errno = ENODATA;
sys_error("environment variable RAWDEV not set", __FILE__,
__LINE__);
}
#endif
/*
* Open the raw disk file
*/
if ((fd = open(raw_dev, 0)) < 0)
sys_error("open failed", __FILE__, __LINE__);
/*
* Read through predefined number of blocks TIMES number of times.
* (Seek back to beginning of raw device after reading 10MB)
*/
for (i = 0; i < TIMES; i++) {
if (read(fd, readbuf, BLOCK_SIZE) != BLOCK_SIZE)
sys_error("read failed", __FILE__, __LINE__);
if (blocks == 10000)
if (lseek(fd, 0, 0) < 0)
sys_error("lseek failed", __FILE__, __LINE__);
}
/*
* Close the raw disk file
*/
if (close(fd) < 0)
sys_error("close failed", __FILE__, __LINE__);
}
/*---------------------------------------------------------------------+
| parse_args () |
| ==================================================================== |
| |
| Function: Parse the command line arguments & initialize global |
| variables. |
| |
| Updates: (command line options) |
| |
| [-t] type: priority type "fixed" or "variable" |
| [-p] priority: priority value |
| [-l] logfile: log file name |
| [-v] verbose |
| [-d] enable debugging messages |
| |
+---------------------------------------------------------------------*/
void parse_args(int argc, char **argv)
{
int opt;
int lflg = 0, pflg = 0, tflg = 0;
int errflag = 0;
char *program_name = *argv;
extern char *optarg; /* Command line option */
/*
* Parse command line options.
*/
if (argc < 2) {
fprintf(stderr, USAGE, program_name);
exit(0);
}
while ((opt = getopt(argc, argv, "l:t:p:vd")) != EOF) {
switch (opt) {
case 'l': /* log file */
lflg++;
logfile = optarg;
break;
case 't': /* process type */
tflg++;
priority_type = optarg;
break;
case 'p': /* process priority */
pflg++;
priority = atoi(optarg);
break;
case 'v': /* verbose */
verbose++;
break;
case 'd': /* enable debugging messages */
verbose++;
debug++;
break;
default:
errflag++;
break;
}
}
/*
* Check percentage and process slots...
*/
if (tflg) {
if (strcmp(priority_type, "fixed") &&
strcmp(priority_type, "variable")) {
errflag++;
fprintf(stderr, "Error: priority type must be: "
"\'fixed\' or \'variable\'\n");
}
}
if (pflg) {
if (priority < 50 || priority > 100) {
errflag++;
fprintf(stderr, "Error: priority range [50..100]\n");
}
}
if (errflag) {
fprintf(stderr, USAGE, program_name);
exit(2);
}
}