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
|
/* Copyright (C) 2021-2023 Free Software Foundation, Inc.
Contributed by Oracle.
This file is part of GNU Binutils.
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 3, 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, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include "stopwatch.h"
/*=======================================================*/
/* pagethrash - allocate some memory, and thrash around in it */
int
pagethrash (int thrashmb)
{
char buf[1024];
hrtime_t start = gethrtime ();
hrtime_t vstart = gethrvtime ();
/* Log the event */
wlog ("start of pagethrash", NULL);
/* Start a stopwatch */
stopwatch_t *w = stpwtch_alloc ("pagethrash", 0);
/* compute the size */
unsigned long size = thrashmb * 1024 * 1024;
int pagesize = getpagesize ();
void *space = malloc (size + pagesize);
if (space == NULL)
{
fprintf (stderr, "\tpagethrash failed; can't get %ld bytes.\n", size);
exit (1);
}
/* round address to page boundary */
unsigned long loc = (((unsigned long) space + pagesize - 1) & ~(pagesize - 1));
long npages = size / pagesize;
/* touch all the pages to force them in */
for (long i = 0; i < npages; i++)
{
stpwtch_start (w);
*(int *) (loc + i * pagesize) = i;
stpwtch_stop (w);
}
/* now free up the space */
free (space);
/* print the timing results */
stpwtch_print (w);
free ((void *) w);
sprintf (buf, "pagethrash: %ld pages", npages);
whrvlog (gethrtime () - start, gethrvtime () - vstart, buf, NULL);
return 0;
}
|
GitWeb
