如何在Mono下获取可用的虚拟和物理内存大小? [英] How to get available virtual and physical memory size under Mono?

问题描述

在Mono下运行时，是否有任何方法可获得可用的虚拟和物理内存大小?

Is there any way to get available virtual and physical memory size when running under Mono?

推荐答案

您可以使用"free"命令的此实现(UNIX)找出已用和可用的物理内存(这是IMHO的最佳选择):

You could use this implementation of the "free" command (UNIX) to find out used and available physical memory (it is the best option IMHO):

using System;
using System.Text.RegularExpressions;
using System.IO;

namespace FreeCSharp
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            FreeCSharp free = new FreeCSharp();
            free.GetValues();

            long buffersPlusCached = free.Buffers + free.Cached;
            long mainUsed = free.MemTotal - free.MemFree;

            // What you would get from free command:
            Console.WriteLine("-/+ buffers/cache:    {0}     {1}", (mainUsed - buffersPlusCached), (free.MemFree + buffersPlusCached));

            // What means:
            Console.WriteLine("Used physical memory: {0} kB", mainUsed - buffersPlusCached);
            Console.WriteLine("Available physical memory: {0} kB", free.MemFree + buffersPlusCached);
        }
    }

    /// <summary>
    /// FreeCSharp: quick implementation of free command (kind of) using C#
    /// </summary>
    public class FreeCSharp
    {
        public long MemTotal { get; private set; }
        public long MemFree { get; private set; }
        public long Buffers { get; private set; }
        public long Cached { get; private set; }

        public void GetValues()
        {
            string[] memInfoLines = File.ReadAllLines(@"/proc/meminfo");

            MemInfoMatch[] memInfoMatches =
            {
                new MemInfoMatch(@"^Buffers:\s+(\d+)", value => Buffers = Convert.ToInt64(value)),
                new MemInfoMatch(@"^Cached:\s+(\d+)", value => Cached = Convert.ToInt64(value)),
                new MemInfoMatch(@"^MemFree:\s+(\d+)", value => MemFree = Convert.ToInt64(value)),
                new MemInfoMatch(@"^MemTotal:\s+(\d+)", value => MemTotal = Convert.ToInt64(value))
            };

            foreach (string memInfoLine in memInfoLines)
            {
                foreach (MemInfoMatch memInfoMatch in memInfoMatches)
                {
                    Match match = memInfoMatch.regex.Match(memInfoLine);
                    if (match.Groups[1].Success)
                    {
                        string value = match.Groups[1].Value;
                        memInfoMatch.updateValue(value);
                    }
                }
            }
        }

        public class MemInfoMatch
        {
            public Regex regex;
            public Action<string> updateValue;

            public MemInfoMatch(string pattern, Action<string> update)
            {
                this.regex = new Regex(pattern, RegexOptions.Compiled);
                this.updateValue = update;
            }
        }
    }
}

或者，也可以使用 sysconf (UNIX)获取当前可用的物理内存页面.此值取决于操作系统已缓存的数据量，因此，您应在运行以下代码之前执行echo 3 > /proc/sys/vm/drop_caches:

Alternatively, it could be used sysconf (UNIX) to get the currently available pages of physical memory. This value depends on how many data the OS has cached, because of that, you should execute echo 3 > /proc/sys/vm/drop_caches before running this code:

using System;
using Mono.Unix.Native;

OperatingSystem os = Environment.OSVersion;
PlatformID pid = os.Platform;
if (pid == PlatformID.Unix || pid == PlatformID.MacOSX) {
    long pages = Syscall.sysconf (SysconfName._SC_AVPHYS_PAGES);
    long page_size = Syscall.sysconf (SysconfName._SC_PAGESIZE);
    Console.WriteLine("The number of currently available pages of physical memory: {0}, Size of a page in bytes: {1} bytes", pages, page_size);
    Console.WriteLine("Mem: {0} bytes", pages * page_size);
 }

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