actual memory free

gistfile1.txt

        fs.readFile('/proc/meminfo', 'utf8', function (err, str) {
            var fields = {};
            str.split('\n').forEach(function (line) {
                var parts = line.split(':');
                if (parts.length === 2) {
                    fields[parts[0]] = parts[1].trim().split(' ', 1)[0];
                }
            });
            cb(fields['MemTotal'] + fields['Buffers'] + fields['Cached']);