mirror of https://github.com/CGAL/cgal
93 lines
3.2 KiB
C++
93 lines
3.2 KiB
C++
// Copyright (c) 2004 Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
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// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
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// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $Source$
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// $Revision$ $Date$
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// $Name$
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//
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// Author(s) : Sylvain Pion
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#ifndef CGAL_MEMORY_SIZER_H
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#define CGAL_MEMORY_SIZER_H
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#include <CGAL/basic.h>
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#include <cstddef>
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#include <cstdio>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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CGAL_BEGIN_NAMESPACE
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// A class giving access to the memory currently used by the process.
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// Both the virtual memory size and the resident size.
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// I put it in a class instead of free functions for similarity with Timer,
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// and in case we want to store some state.
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struct Memory_sizer {
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typedef std::size_t size_type;
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size_type virtual_size() const { return get(true); };
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size_type resident_size() const { return get(false); };
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private:
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size_type get(bool virtual_size) const
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{
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// Extract of "man proc" under Linux :
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//
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// vsize %u Virtual memory size
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//
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// rss %u Resident Set Size: number of pages
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// the process has in real memory,
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// minus 3 for administrative purposes.
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// This is just the pages which count
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// towards text, data, or stack space.
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// This does not include pages which
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// have not been demand-loaded in, or
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// which are swapped out.
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int pid;
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char name[1024];
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char state;
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int ppid, pgrp, session, tty, tpgid;
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unsigned flags, minflt, cminflt, majflt, cmajflt;
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int utime, stime, cutime, cstime, counter, priority, timeout;
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unsigned itrealvalue, starttime, vsize = 0, rss = 0;
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FILE *f = fopen("/proc/self/stat", "r");
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CGAL_assertion(f);
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fscanf(f, "%d %s %c %d %d %d %d %d %u "
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"%u %u %u %u %d %d %d "
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"%d %d %d %u %u %d "
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"%u %u",
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&pid, name, &state, &ppid, &pgrp, &session, &tty, &tpgid, &flags,
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&minflt, &cminflt, &majflt, &cmajflt, &utime, &stime, &cutime,
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&cstime, &counter, &priority, &timeout, &itrealvalue, &starttime,
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&vsize, &rss);
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fclose(f);
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return virtual_size ? vsize : rss * getpagesize();
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}
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};
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CGAL_END_NAMESPACE
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#endif
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