[英]Microsoft.Web.Administration memory leak
具有Windows服务,该服务除其他外,可监视IIS应用程序池。 如果任何池已配置了应用程序且未运行,则将启动该池(池)。 一段时间以来,它一直运行良好。 最近发现该服务正在泄漏内存。 查看内存转储的罪魁祸首是用于检查应用程序池的Microsoft.Web.Administration。 唯一可抛弃的对象是ServerManager,我在using块中拥有它。 已经找到有关此泄漏的其他报告,但尚未解决。 (请参阅http://msdn.microsoft.com/zh-cn/library/microsoft.web.administration.servermanager(v=vs.90).aspx#CommunityContent中的用户注释)
转储Microsoft.Web.Administration.ServerManager的所有根(此转储中为481)时,我只能看到其中一个根。 假设这是当前迭代。
不知道为什么这些Web.Administration对象不能被收集,即使它们似乎没有被植根(?)。 关于如何解决此泄漏的任何想法?
我将代码移至控制台应用程序,并在此复制了泄漏。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using Microsoft.Web.Administration;
namespace Web.Administration.LeakExample
{
public static class ServerManagerExtensions
{
/// <summary>
/// Returns the application counts for application pools under the specified ServerManager.
/// Application pools without applications will not be returned.
/// </summary>
/// <param name="manager"></param>
/// <returns></returns>
public static Dictionary<string, uint> GetPoolApplicationCounts(this ServerManager manager)
{
if (manager == null)
{
throw new ArgumentNullException();
}
var appCounts = new Dictionary<string, uint>(manager.ApplicationPools.Count);
foreach (var app in manager.Sites.SelectMany(site => site.Applications))
{
if (!appCounts.ContainsKey(app.ApplicationPoolName))
{
appCounts.Add(app.ApplicationPoolName, 1);
}
else
{
appCounts[app.ApplicationPoolName]++;
}
}
return appCounts;
}
}
class Program
{
static void Main(string[] args)
{
while (!Console.KeyAvailable)
{
Console.WriteLine("Checking App Pools...");
using (var manager = new ServerManager())
{
var appCounts = manager.GetPoolApplicationCounts();
var appPools = manager.ApplicationPools.Where(pool => appCounts.ContainsKey(pool.Name));
foreach (
var pool in
appPools.Where(
pool => (pool.State != ObjectState.Started) && (pool.State != ObjectState.Starting)))
{
var state = pool.Start();
if ((state == ObjectState.Started) || (state == ObjectState.Starting))
{
Console.WriteLine("Started app pool \"{0}\"", pool.Name);
}
else
{
Console.WriteLine("Failed to start app pool \"{0}\". state:{1}", pool.Name, state);
}
}
}
Console.WriteLine("Sleeping...");
Thread.Sleep(1000);
}
}
}
}
WinDbg会话:
> !dumpheap -stat
606b778c 479 5748 System.Runtime.Remoting.Activation.ConstructionLevelActivator
00472088 480 5760 System.Collections.Generic.Dictionary`2+ValueCollection[[System.String, mscorlib],[Microsoft.Web.Administration.Interop.IAppHostElement, Microsoft.Web.Administration]]
00471d5c 480 5760 System.Collections.Generic.SortedList`2+ValueList[[System.String, mscorlib],[Microsoft.Web.Administration.Configuration, Microsoft.Web.Administration]]
00194568 481 5772 Web.Administration.LeakExample.Program+<>c__DisplayClass3
00198438 480 7680 Microsoft.Web.Administration.Interop.AppHostWritableAdminManager
0047199c 481 7696 System.Linq.Enumerable+<>c__DisplayClassf`1[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
606cc200 958 11496 System.Char
00471e2c 479 11496 System.Collections.Generic.SortedList`2+SortedListValueEnumerator[[System.String, mscorlib],[Microsoft.Web.Administration.Configuration, Microsoft.Web.Administration]]
0047090c 479 11496 System.Collections.Generic.List`1+Enumerator[[Microsoft.Web.Administration.Site, Microsoft.Web.Administration]]
004706f0 958 11496 Microsoft.Web.Administration.ConfigurationElementCollectionBase`1+<>c__DisplayClass4[[Microsoft.Web.Administration.Site, Microsoft.Web.Administration]]
00471aec 480 11520 System.Collections.Generic.List`1+Enumerator[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
0047041c 480 11520 System.Collections.Generic.List`1[[Microsoft.Web.Administration.Site, Microsoft.Web.Administration]]
00196d58 480 11520 System.Collections.Generic.List`1[[Microsoft.Web.Administration.Configuration, Microsoft.Web.Administration]]
004715cc 481 11544 System.Collections.Generic.List`1[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
0047103c 1437 17244 Microsoft.Web.Administration.ConfigurationElementCollectionBase`1+<>c__DisplayClass4[[Microsoft.Web.Administration.Application, Microsoft.Web.Administration]]
606ccfc8 1438 17256 System.Int32
00196a58 480 19200 System.Collections.Generic.SortedList`2[[System.String, mscorlib],[Microsoft.Web.Administration.Configuration, Microsoft.Web.Administration]]
0019660c 480 21120 Microsoft.Web.Administration.ConfigurationManager
00471130 958 22992 System.Collections.Generic.List`1+Enumerator[[Microsoft.Web.Administration.Application, Microsoft.Web.Administration]]
00470d68 960 23040 System.Collections.Generic.List`1[[Microsoft.Web.Administration.Application, Microsoft.Web.Administration]]
00198558 480 23040 System.Collections.Generic.Dictionary`2[[System.String, mscorlib],[Microsoft.Web.Administration.Interop.IAppHostElement, Microsoft.Web.Administration]]
00196a08 481 23088 Microsoft.Web.Administration.Configuration
00183170 481 23088 System.Collections.Generic.Dictionary`2[[System.String, mscorlib],[System.UInt32, mscorlib]]
606b7574 479 24908 System.Runtime.Remoting.Messaging.ConstructorCallMessage
00199e7c 479 24908 System.Linq.Enumerable+<SelectManyIterator>d__14`2[[Microsoft.Web.Administration.Site, Microsoft.Web.Administration],[Microsoft.Web.Administration.Application, Microsoft.Web.Administration]]
00199384 480 28800 System.Collections.Generic.Dictionary`2+Entry[[System.String, mscorlib],[Microsoft.Web.Administration.Interop.IAppHostElement, Microsoft.Web.Administration]][]
00470874 958 30656 System.Predicate`1[[Microsoft.Web.Administration.Site, Microsoft.Web.Administration]]
004718a8 962 30784 System.Linq.Enumerable+WhereEnumerableIterator`1[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
001944d8 481 30784 Microsoft.Web.Administration.ServerManager
00195178 963 30816 System.Func`2[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration],[System.Boolean, mscorlib]]
606ccf90 968 31268 System.Int32[]
00197a50 480 32640 Microsoft.Web.Administration.SiteCollection
00194da0 481 32708 Microsoft.Web.Administration.ApplicationPoolCollection
004719f8 2874 34488 Microsoft.Web.Administration.ConfigurationElementCollectionBase`1+<>c__DisplayClass4[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
0019810c 960 42240 Microsoft.Web.Administration.ConfigurationSection
00471098 1437 45984 System.Predicate`1[[Microsoft.Web.Administration.Application, Microsoft.Web.Administration]]
606cc1c8 961 46638 System.Char[]
001838d0 481 59644 System.Collections.Generic.Dictionary`2+Entry[[System.String, mscorlib],[System.UInt32, mscorlib]][]
606bedd0 5269 63228 System.UInt32
00470a7c 960 69120 Microsoft.Web.Administration.ApplicationCollection
00197c60 960 76800 Microsoft.Web.Administration.Site
00197ea8 1440 86400 Microsoft.Web.Administration.Application
00471a54 2874 91968 System.Predicate`1[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
6067c684 4832 141272 System.Object[]
00195024 2886 196248 Microsoft.Web.Administration.ApplicationPool
606c7b20 16323 261168 System.__ComObject
>.foreach (obj {!dumpheap -mt 001944d8 -short}){!gcroot -all obj}
002ef124 003f0359 Web.Administration.LeakExample.Program.Main(System.String[]) [c:\Users\Chuck\Documents\Visual Studio 2012\Projects\Web.Administration.LeakExample\Web.Administration.LeakExample\Program.cs @ 74]
ebp+70: 002ef148
-> 02773270 System.Linq.Enumerable+WhereEnumerableIterator`1[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
-> 02772948 Microsoft.Web.Administration.ApplicationPoolCollection
-> 02772060 Microsoft.Web.Administration.ServerManager
002ef124 003f0359 Web.Administration.LeakExample.Program.Main(System.String[]) [c:\Users\Chuck\Documents\Visual Studio 2012\Projects\Web.Administration.LeakExample\Web.Administration.LeakExample\Program.cs @ 74]
ebp+68: 002ef150
-> 02773270 System.Linq.Enumerable+WhereEnumerableIterator`1[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
-> 02772948 Microsoft.Web.Administration.ApplicationPoolCollection
-> 02772060 Microsoft.Web.Administration.ServerManager
002ef124 003f0359 Web.Administration.LeakExample.Program.Main(System.String[]) [c:\Users\Chuck\Documents\Visual Studio 2012\Projects\Web.Administration.LeakExample\Web.Administration.LeakExample\Program.cs @ 74]
ebp+78: 002ef140
-> 027732c0 System.Linq.Enumerable+WhereEnumerableIterator`1[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
-> 02772948 Microsoft.Web.Administration.ApplicationPoolCollection
-> 02772060 Microsoft.Web.Administration.ServerManager
002ef124 003f0359 Web.Administration.LeakExample.Program.Main(System.String[]) [c:\Users\Chuck\Documents\Visual Studio 2012\Projects\Web.Administration.LeakExample\Web.Administration.LeakExample\Program.cs @ 74]
ebp+6c: 002ef14c
-> 02773270 System.Linq.Enumerable+WhereEnumerableIterator`1[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
-> 02772948 Microsoft.Web.Administration.ApplicationPoolCollection
-> 02772060 Microsoft.Web.Administration.ServerManager
002ef124 003f0359 Web.Administration.LeakExample.Program.Main(System.String[]) [c:\Users\Chuck\Documents\Visual Studio 2012\Projects\Web.Administration.LeakExample\Web.Administration.LeakExample\Program.cs @ 74]
ebp+74: 002ef144
-> 027732c0 System.Linq.Enumerable+WhereEnumerableIterator`1[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
-> 02772948 Microsoft.Web.Administration.ApplicationPoolCollection
-> 02772060 Microsoft.Web.Administration.ServerManager
002ef124 003f0359 Web.Administration.LeakExample.Program.Main(System.String[]) [c:\Users\Chuck\Documents\Visual Studio 2012\Projects\Web.Administration.LeakExample\Web.Administration.LeakExample\Program.cs @ 74]
ebp+60: 002ef158
-> 02772948 Microsoft.Web.Administration.ApplicationPoolCollection
-> 02772060 Microsoft.Web.Administration.ServerManager
002ef124 003f0359 Web.Administration.LeakExample.Program.Main(System.String[]) [c:\Users\Chuck\Documents\Visual Studio 2012\Projects\Web.Administration.LeakExample\Web.Administration.LeakExample\Program.cs @ 74]
ebp+3c: 002ef17c
-> 02772060 Microsoft.Web.Administration.ServerManager
002ef124 003f0359 Web.Administration.LeakExample.Program.Main(System.String[]) [c:\Users\Chuck\Documents\Visual Studio 2012\Projects\Web.Administration.LeakExample\Web.Administration.LeakExample\Program.cs @ 74]
ebp+4c: 002ef16c
-> 027732c0 System.Linq.Enumerable+WhereEnumerableIterator`1[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
-> 02772948 Microsoft.Web.Administration.ApplicationPoolCollection
-> 02772060 Microsoft.Web.Administration.ServerManager
002ef124 003f0359 Web.Administration.LeakExample.Program.Main(System.String[]) [c:\Users\Chuck\Documents\Visual Studio 2012\Projects\Web.Administration.LeakExample\Web.Administration.LeakExample\Program.cs @ 74]
ebp+40: 002ef178
-> 02773270 System.Linq.Enumerable+WhereEnumerableIterator`1[[Microsoft.Web.Administration.ApplicationPool, Microsoft.Web.Administration]]
-> 02772948 Microsoft.Web.Administration.ApplicationPoolCollection
-> 02772060 Microsoft.Web.Administration.ServerManager
002ef124 003f0359 Web.Administration.LeakExample.Program.Main(System.String[]) [c:\Users\Chuck\Documents\Visual Studio 2012\Projects\Web.Administration.LeakExample\Web.Administration.LeakExample\Program.cs @ 74]
ebp+50: 002ef168
-> 02772060 Microsoft.Web.Administration.ServerManager
Found 10 roots.
当我第一次阅读该问题时,我想到的第一件事是,可以通过使用Windows激活服务(WAS)完全避免整个问题。
我对您发布的代码的第一次了解使我感到您的问题可能与访问/修改由foreach
循环创建的各种闭包有关。
尝试这些小的重构,看看是否有任何/全部能够减少或消除问题或失败的方法,从而提供了更多有关根本原因的信息:
.ToList()
避免延迟执行LINQ查询 ServerManager
对象,而是在循环的每次迭代中创建一个新对象 由于您仅使用ApplicationPool.Name
,因此请重构:
foreach (var app in manager.Sites.SelectMany(site => site.Applications))
对此:
foreach (var app in manager.Sites.SelectMany(site => site.Applications,
(s, a) => a.Name)
.ToList())
我的假设是正在发生的事情:
using
语句中创建ServerManager
新实例 ApplicationPools
ApplicationPools
,该IQueryable会立即使用(但不会完全执行foreach
语句在内部使用yield return
)并进行过滤。 .Start()
更改(突变) ServerManager
对象引用所引用的ApplicationPool
状态 ServerManager
。 由于该引用具有突变状态(由于调用.Start()
),因此它可能已被GC标记并且从未被收集-该应用程序池从不返回后续迭代的结果,并且可能导致该引用的孤立记忆。 请记住,这只是一个假设!
我现在认为这不是真正的泄漏。 我尝试按照Josh的建议对所有内容进行ToList()处理。 这不会影响内存使用。
我将GC.Collect()添加到循环中(仅用于测试目的),从而消除了“泄漏”。 我通过进行内存转储来验证这一点,如果我在堆上没有找到Web.Application对象。 这与我以前的转储中看到的所有Web.Application对象实际上都植根这一事实相吻合。 其他人没有扎根,等待被收集。
.NET垃圾收集器的不确定性使我大跌眼镜。 对不起,噪音。
我在这里找到了解决方案: www.tomanderson.me 。
建议使用
using (ServerManager sm = ServerManager.OpenRemote("localhost"))
{ /*..*/ }
对我有用。
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