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/***************************************************************************
* tools/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>
* Copyright (C) 2013 Timo Bingmann <tb@panthema.net>
*
* 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 <stxxl/bits/config.h>
#include <stxxl/bits/verbose.h>
#if STXXL_HAVE_MLOCK_PROTO
#include <cerrno>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <sys/mman.h>
#include <unistd.h>
#include <stxxl/cmdline>
int do_mlock(int argc, char* argv[])
{
// parse command line
stxxl::cmdline_parser cp;
cp.set_description("Allocate some memory and mlock() it to consume physical memory. "
"Needs to run as root to block more than 64 KiB in default settings."
);
cp.set_author("Andreas Beckmann <beckmann@cs.uni-frankfurt.de>");
stxxl::uint64 M;
cp.add_param_bytes("size", "Amount of memory to allocate (e.g. 4GiB)", M);
if (!cp.process(argc, argv))
return -1;
// allocate and fill
char* c = (char*)malloc(M);
memset(c, 42, M);
if (mlock(c, M) == 0)
{
std::cout << "mlock(" << (void*)c << ", " << M << ") successful, press Ctrl-C to exit." << std::endl;
while (1)
sleep(86400);
}
else {
std::cerr << "mlock(" << (void*)c << ", " << M << ") failed: " << strerror(errno) << std::endl;
return 1;
}
}
#else // !STXXL_HAVE_MLOCK_PROTO
int do_mlock(int, char*[])
{
STXXL_MSG("Sorry, mlock() is not supported on this platform.");
return -1;
}
#endif // STXXL_HAVE_MLOCK_PROTO
// vim: et:ts=4:sw=4
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