1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
/* 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 );
}
|