/* $Id: alloc-1.c 82968 2020-02-04 10:35:17Z vboxsync $ */ /** @file * Allocate lots of memory, portable ANSI C code. */ /* * Copyright (C) 2007-2020 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #include #include int main(int argc, char **argv) { unsigned uPct; unsigned long cbDone; unsigned long cMBs = 1024; unsigned long cb; /* * Some quick and dirty argument parsing. */ if (argc == 2) cMBs = strtoul(argv[1], 0, 0); if (!cMBs || argc > 2) { printf("usage: alloc-1 [MBs]\n"); return 1; } cb = cMBs * 1024 * 1024; if (cb / (1024 * 1024) != cMBs) cb = ~(unsigned long)0 / (1024 * 1024) * (1024 * 1024); printf("alloc-1: allocating %lu MB (%lu bytes)\n", cb/1024/1024, cb); /* * The allocation loop. */ printf("alloc-1: 0%%"); fflush(stdout); cbDone = 0; uPct = 0; while (cbDone < cb) { unsigned uPctNow; unsigned long cbThis = cb > 10*1024*1024 ? 10*1024*1024 : cb; char *pb = malloc(cbThis); if (!pb) { printf("\nalloc-1: calloc failed, cbDone=%lu MB (%lu bytes)\n", cbDone/1024/1024, cbDone); return 1; } cbDone += cbThis; /* touch the memory. */ while (cbThis >= 0x1000) { *pb = (char)cbThis; pb += 0x1000; cbThis -= 0x1000; } /* progress */ uPctNow = 100.0 * cbDone / cb; if (uPctNow != uPct && !(uPctNow & 1)) { if (!(uPctNow % 10)) printf("%u%%", uPctNow); else printf("."); fflush(stdout); } uPct = uPctNow; } printf("\nalloc-1: done\n"); return 0; }