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/* NOT copyright by SoftQuad Inc. -- msb, 1988 */
#ifndef lint
static char *SQ_SccsId = "@(#)mtest3.c 1.2 88/08/25";
#endif
#include <stdio.h>
/*
** looptest.c -- intensive allocator tester
**
** Usage: looptest
**
** History:
** 4-Feb-1987 rtech!daveb
*/
# ifdef SYS5
# define random rand
# else
# include <sys/vadvise.h>
# endif
# include <stdio.h>
# include <signal.h>
# include <setjmp.h>
# define MAXITER 1000000 /* main loop iterations */
# define MAXOBJS 1000 /* objects in pool */
# define BIGOBJ 90000 /* max size of a big object */
# define TINYOBJ 80 /* max size of a small object */
# define BIGMOD 100 /* 1 in BIGMOD is a BIGOBJ */
# define STATMOD 10000 /* interation interval for status */
main( argc, argv )
int argc;
char **argv;
{
register int **objs; /* array of objects */
register int *sizes; /* array of object sizes */
register int n; /* iteration counter */
register int i; /* object index */
register int size; /* object size */
register int r; /* random number */
int objmax; /* max size this iteration */
int cnt; /* number of allocated objects */
int nm = 0; /* number of mallocs */
int nre = 0; /* number of reallocs */
int nal; /* number of allocated objects */
int nfre; /* number of free list objects */
long alm; /* memory in allocated objects */
long frem; /* memory in free list */
long startsize; /* size at loop start */
long endsize; /* size at loop exit */
long maxiter = 0; /* real max # iterations */
extern char end; /* memory before heap */
char *calloc();
char *malloc();
char *sbrk();
long atol();
# ifndef SYS5
/* your milage may vary... */
vadvise( VA_ANOM );
# endif
if (argc > 1)
maxiter = atol (argv[1]);
if (maxiter <= 0)
maxiter = MAXITER;
printf("MAXITER %d MAXOBJS %d ", maxiter, MAXOBJS );
printf("BIGOBJ %d, TINYOBJ %d, nbig/ntiny 1/%d\n",
BIGOBJ, TINYOBJ, BIGMOD );
fflush( stdout );
if( NULL == (objs = (int **)calloc( MAXOBJS, sizeof( *objs ) ) ) )
{
fprintf(stderr, "Can't allocate memory for objs array\n");
exit(1);
}
if( NULL == ( sizes = (int *)calloc( MAXOBJS, sizeof( *sizes ) ) ) )
{
fprintf(stderr, "Can't allocate memory for sizes array\n");
exit(1);
}
/* as per recent discussion on net.lang.c, calloc does not
** necessarily fill in NULL pointers...
*/
for( i = 0; i < MAXOBJS; i++ )
objs[ i ] = NULL;
startsize = sbrk(0) - &end;
printf( "Memory use at start: %d bytes\n", startsize );
fflush(stdout);
printf("Starting the test...\n");
fflush(stdout);
for( n = 0; n < maxiter ; n++ )
{
if( !(n % STATMOD) )
{
printf("%d iterations\n", n);
fflush(stdout);
}
/* determine object of interst and it's size */
r = random();
objmax = ( r % BIGMOD ) ? TINYOBJ : BIGOBJ;
size = r % objmax;
i = r % (MAXOBJS - 1);
/* either replace the object of get a new one */
if( objs[ i ] == NULL )
{
objs[ i ] = (int *)malloc( size );
nm++;
}
else
{
/* don't keep bigger objects around */
if( size > sizes[ i ] )
{
objs[ i ] = (int *)realloc( objs[ i ], size );
nre++;
}
else
{
free( objs[ i ] );
objs[ i ] = (int *)malloc( size );
nm++;
}
}
sizes[ i ] = size;
if( objs[ i ] == NULL )
{
printf("\nCouldn't allocate %d byte object!\n",
size );
break;
}
} /* for() */
printf( "\n" );
cnt = 0;
for( i = 0; i < MAXOBJS; i++ )
if( objs[ i ] )
cnt++;
printf( "Did %d iterations, %d objects, %d mallocs, %d reallocs\n",
n, cnt, nm, nre );
printf( "Memory use at end: %d bytes\n", sbrk(0) - &end );
fflush( stdout );
/* free all the objects */
for( i = 0; i < MAXOBJS; i++ )
if( objs[ i ] != NULL )
free( objs[ i ] );
endsize = sbrk(0) - &end;
printf( "Memory use after free: %d bytes\n", endsize );
fflush( stdout );
if( startsize != endsize )
printf("startsize %d != endsize %d\n", startsize, endsize );
free( objs );
free( sizes );
malloc_dump(2);
exit( 0 );
}
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