100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
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#ifndef OSMIUM_UTIL_MEMORY_HPP
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#define OSMIUM_UTIL_MEMORY_HPP
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/*
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This file is part of Osmium (http://osmcode.org/libosmium).
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Copyright 2013-2016 Jochen Topf <jochen@topf.org> and others (see README).
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#include <cstdlib>
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#include <fstream>
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#include <string>
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namespace osmium {
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class MemoryUsage {
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int m_current = 0;
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int m_peak = 0;
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#ifdef __linux__
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int parse_number(const std::string& line) {
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int f = line.find_first_of("0123456789");
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int l = line.find_last_of("0123456789");
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return std::atoi(line.substr(f, l-f+1).c_str());
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}
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#endif
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public:
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/**
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* Get the memory usage for the current process. The constructor will
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* get the memory usage. Use the current() and peak() calls to access
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* the result.
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*
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* This will only work on Linux, on other architectures this will
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* always return 0.
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*/
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MemoryUsage() {
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#ifdef __linux__
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static const char* filename = "/proc/self/status";
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std::ifstream status_file(filename);
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if (status_file.is_open()) {
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std::string line;
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while (! status_file.eof() ) {
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std::getline(status_file, line);
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if (line.substr(0, 6) == "VmPeak") {
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m_peak = parse_number(line);
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}
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if (line.substr(0, 6) == "VmSize") {
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m_current = parse_number(line);
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}
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}
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}
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#endif
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}
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/// Return current memory usage in MBytes
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int current() const {
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return m_current / 1024;
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}
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/// Return peak memory usage in MBytes
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int peak() const {
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return m_peak / 1024;
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}
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}; // class MemoryUsage
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} // namespace osmium
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#endif // OSMIUM_UTIL_MEMORY_HPP
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