在Mono下运行时,是否有任何方法可以获取可用的虚拟和物理内存大小?
最佳答案
您可以使用"free" command(UNIX)的此实现来找出已用和可用的物理内存(这是IMHO的最佳选择):
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,可以使用sysconf(UNIX)来获取物理内存的当前可用页面。该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
: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);
}