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/***************************************************************************
* utils/mlock.cpp
*
* Allocate some memory and mlock() it to consume physical memory.
* Needs to run as root to block more than 64 KiB in default settings.
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2010 Andreas Beckmann <beckmann@cs.uni-frankfurt.de>
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
**************************************************************************/
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <sys/mman.h>
#include <unistd.h>
int main(int argc, char ** argv)
{
if (argc == 2) {
long M = atol(argv[1]);
if (M > 0) {
char * c = (char *)malloc(M);
for (long i = 0; i < M; ++i)
c[i] = 42;
if (mlock(c, M) == 0) {
std::cout << "mlock(, " << M << ") successful, press Ctrl-C to finish" << std::endl;
while (1)
sleep(86400);
} else {
std::cerr << "mlock(, " << M << ") failed!" << std::endl;
return 1;
}
}
} else {
std::cout << "Usage: " << argv[0] << " <bytes>" << std::endl;
}
}
// vim: et:ts=4:sw=4
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