| 1 | /* $Id: alloc-1.c 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Allocate lots of memory, portable ANSI C code.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <stdlib.h>
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| 32 | #include <stdio.h>
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| 33 |
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| 34 |
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| 35 | int main(int argc, char **argv)
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| 36 | {
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| 37 | unsigned uPct;
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| 38 | unsigned long cbDone;
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| 39 | unsigned long cMBs = 1024;
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| 40 | unsigned long cb;
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| 41 |
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| 42 | /*
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| 43 | * Some quick and dirty argument parsing.
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| 44 | */
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| 45 | if (argc == 2)
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| 46 | cMBs = strtoul(argv[1], 0, 0);
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| 47 | if (!cMBs || argc > 2)
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| 48 | {
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| 49 | printf("usage: alloc-1 [MBs]\n");
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| 50 | return 1;
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| 51 | }
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| 52 | cb = cMBs * 1024 * 1024;
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| 53 | if (cb / (1024 * 1024) != cMBs)
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| 54 | cb = ~(unsigned long)0 / (1024 * 1024) * (1024 * 1024);
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| 55 | printf("alloc-1: allocating %lu MB (%lu bytes)\n", cb/1024/1024, cb);
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| 56 |
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| 57 | /*
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| 58 | * The allocation loop.
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| 59 | */
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| 60 | printf("alloc-1: 0%%");
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| 61 | fflush(stdout);
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| 62 | cbDone = 0;
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| 63 | uPct = 0;
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| 64 | while (cbDone < cb)
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| 65 | {
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| 66 | unsigned uPctNow;
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| 67 | unsigned long cbThis = cb > 10*1024*1024 ? 10*1024*1024 : cb;
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| 68 | char *pb = malloc(cbThis);
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| 69 | if (!pb)
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| 70 | {
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| 71 | printf("\nalloc-1: calloc failed, cbDone=%lu MB (%lu bytes)\n",
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| 72 | cbDone/1024/1024, cbDone);
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| 73 | return 1;
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| 74 | }
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| 75 | cbDone += cbThis;
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| 76 |
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| 77 | /* touch the memory. */
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| 78 | while (cbThis >= 0x1000)
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| 79 | {
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| 80 | *pb = (char)cbThis;
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| 81 | pb += 0x1000;
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| 82 | cbThis -= 0x1000;
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| 83 | }
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| 84 |
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| 85 | /* progress */
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| 86 | uPctNow = 100.0 * cbDone / cb;
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| 87 | if (uPctNow != uPct && !(uPctNow & 1))
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| 88 | {
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| 89 | if (!(uPctNow % 10))
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| 90 | printf("%u%%", uPctNow);
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| 91 | else
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| 92 | printf(".");
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| 93 | fflush(stdout);
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| 94 | }
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| 95 | uPct = uPctNow;
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| 96 | }
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| 97 |
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| 98 | printf("\nalloc-1: done\n");
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| 99 | return 0;
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| 100 | }
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