[英]EF6 Memory leak without any reason
我找到這個問題已經有一段時間了,但我100%確定它正在發生,至少在我的機器上。
我能夠發現只是這一小段代碼導致內存泄漏,但我仍然不知道為什么。
for (int i = 0; i < 1000000; i++)
{
using (var db = new TestEntity())
{
db.Configuration.AutoDetectChangesEnabled = false;
db.Configuration.ValidateOnSaveEnabled = false;
// If I just create new Context everything is normal.
// I need to request anything
{
var any = (bool)db.Test.AsNoTracking().Any();
}
// Or more simply just in that way
// var any = db.Test.AsNoTracking().Any();
}
if (i % 1000 == 0)
{
Console.WriteLine(i.ToString());
}
}
這段代碼很簡單,我仍然無法看到導致問題的原因。
我在單次迭代中創建新的Context,然后只是Dispose()
它。 我的bool變量是本地的,從不使用。 我也使用Any()
返回bool值而不是對象的引用。
我不同意Garbage Collector
沒有時間收集,因為無論我何時強迫他Collect()
它仍然在泄漏。 EF團隊還建議盡可能短時間使用Context。
更重要的是,這種泄漏正在/發生在非托管內存中。 使用ANTS Memory Profiler的結果是我可以看到有泄漏,但我仍然不知道為什么。
此代碼在1分鍾(~200k迭代)后導致EntityFramework.dll
中出現StackOverflowException
:
An unhandled exception of type 'System.StackOverflowException' occurred in EntityFramework.dll
在非托管內存中,我可以看到大約8192字節的~200k對象。
這不是不現實的情況。 這是阻止我的真正問題。
這是我真實軟件中發生的事情的基本模型。 我需要先解析數百萬行不同格式的行,然后檢查數據庫中是否存在記錄。
重現您需要的問題:主程序:
using System;
using System.Linq;
namespace ConsoleApplication31
{
class Program
{
static void Main(string[] args)
{
var test = new TestClass();
test.Test();
Console.ReadLine();
}
}
public class TestClass
{
public void Test()
{
try
{
for (int i = 0; i < 1000000; i++)
{
using (var db = new TestEntity())
{
db.Configuration.AutoDetectChangesEnabled = false;
db.Configuration.ValidateOnSaveEnabled = false;
{
var any = (bool)db.Test.AsNoTracking().Any();
}
}
if (i % 1000 == 0)
{
Console.WriteLine(i.ToString());
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
}
}
和DB模型實體:
namespace ConsoleApplication31
{
using System.Data.Entity;
public partial class TestEntity : DbContext
{
public TestEntity()
: base("name=TestEntityConnectionString")
{
}
public virtual DbSet<Test> Test { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
Database.SetInitializer<TestEntity>(null);
}
}
}
有測試表:
using System.ComponentModel.DataAnnotations;
namespace ConsoleApplication31
{
public partial class Test
{
[Key]
[Required]
public long TestId { get; set; }
[Required]
public string TestName { get; set; }
[Required]
public string TestDescription { get; set; }
}
}
我的配置:
a)4C / 8T 16GB RAM,Windows 10 14393(RTM),Visual Studio 2015,Sql Server 2016
b)2C / 4T 8GB RAM,完全相同的系統(相同的磁盤,連接到其他機器)
在.NET Framework版本上測試:4.5,4.5.2,4.6.1,4.6.2
在Entity Framework版本上測試:6.0.0,6.1.3
我將不勝感激任何幫助。
當有大約700MB的內存使用時調用堆棧:[管理到本機轉換]
System.Data.dll!SNINativeMethodWrapper.SNIReadSyncOverAsync(System.Runtime.InteropServices.SafeHandle pConn = {System.Data.SqlClient.SNIHandle}, ref System.IntPtr packet = {System.IntPtr}, int timeout) Unknown
System.Data.dll!System.Data.SqlClient.TdsParserStateObject.ReadSniSyncOverAsync() Unknown
System.Data.dll!System.Data.SqlClient.TdsParserStateObject.TryReadNetworkPacket() Unknown
System.Data.dll!System.Data.SqlClient.TdsParserStateObject.TryPrepareBuffer() Unknown
System.Data.dll!System.Data.SqlClient.TdsParserStateObject.TryReadByte(out byte value = 0) Unknown
System.Data.dll!System.Data.SqlClient.TdsParser.TryRun(System.Data.SqlClient.RunBehavior runBehavior = ReturnImmediately, System.Data.SqlClient.SqlCommand cmdHandler = {System.Data.SqlClient.SqlCommand}, System.Data.SqlClient.SqlDataReader dataStream = {System.Data.SqlClient.SqlDataReader}, System.Data.SqlClient.BulkCopySimpleResultSet bulkCopyHandler = null, System.Data.SqlClient.TdsParserStateObject stateObj, out bool dataReady = false) Unknown
System.Data.dll!System.Data.SqlClient.SqlDataReader.TryConsumeMetaData() Unknown
System.Data.dll!System.Data.SqlClient.SqlDataReader.MetaData.get() Unknown
System.Data.dll!System.Data.SqlClient.SqlCommand.FinishExecuteReader(System.Data.SqlClient.SqlDataReader ds = {System.Data.SqlClient.SqlDataReader}, System.Data.SqlClient.RunBehavior runBehavior, string resetOptionsString, bool isInternal, bool forDescribeParameterEncryption) Unknown
System.Data.dll!System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(System.Data.CommandBehavior cmdBehavior, System.Data.SqlClient.RunBehavior runBehavior, bool returnStream, bool async, int timeout, out System.Threading.Tasks.Task task, bool asyncWrite, bool inRetry, System.Data.SqlClient.SqlDataReader ds, bool describeParameterEncryptionRequest) Unknown
System.Data.dll!System.Data.SqlClient.SqlCommand.RunExecuteReader(System.Data.CommandBehavior cmdBehavior, System.Data.SqlClient.RunBehavior runBehavior, bool returnStream, string method, System.Threading.Tasks.TaskCompletionSource<object> completion, int timeout, out System.Threading.Tasks.Task task, out bool usedCache, bool asyncWrite, bool inRetry) Unknown
System.Data.dll!System.Data.SqlClient.SqlCommand.RunExecuteReader(System.Data.CommandBehavior cmdBehavior, System.Data.SqlClient.RunBehavior runBehavior, bool returnStream, string method) Unknown
System.Data.dll!System.Data.SqlClient.SqlCommand.ExecuteReader(System.Data.CommandBehavior behavior, string method) Unknown
System.Data.dll!System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(System.Data.CommandBehavior behavior) Unknown
System.Data.dll!System.Data.Common.DbCommand.ExecuteReader(System.Data.CommandBehavior behavior) Unknown
EntityFramework.dll!System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader.AnonymousMethod__c(System.Data.Common.DbCommand t, System.Data.Entity.Infrastructure.Interception.DbCommandInterceptionContext<System.Data.Common.DbDataReader> c) Unknown
EntityFramework.dll!System.Data.Entity.Infrastructure.Interception.InternalDispatcher<System.Data.Entity.Infrastructure.Interception.IDbCommandInterceptor>.Dispatch<System.Data.Common.DbCommand, System.Data.Entity.Infrastructure.Interception.DbCommandInterceptionContext<System.Data.Common.DbDataReader>, System.Data.Common.DbDataReader>(System.Data.Common.DbCommand target, System.Func<System.Data.Common.DbCommand, System.Data.Entity.Infrastructure.Interception.DbCommandInterceptionContext<System.Data.Common.DbDataReader>, System.Data.Common.DbDataReader> operation, System.Data.Entity.Infrastructure.Interception.DbCommandInterceptionContext<System.Data.Common.DbDataReader> interceptionContext, System.Action<System.Data.Entity.Infrastructure.Interception.IDbCommandInterceptor, System.Data.Common.DbCommand, System.Data.Entity.Infrastructure.Interception.DbCommandInterceptionContext<System.Data.Common.DbDataReader>> executing, System.Action<System.Data.Entity.Infrastructure.Interception.IDbCommandInterceptor, System.Data.Common.DbCommand, System.Data.Entity.Infrastructure.Interception.DbCommandInterceptionContext<System.Data.Common.DbDataReader>> executed) Unknown
EntityFramework.dll!System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(System.Data.Common.DbCommand command, System.Data.Entity.Infrastructure.Interception.DbCommandInterceptionContext interceptionContext) Unknown
EntityFramework.dll!System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(System.Data.CommandBehavior behavior) Unknown
System.Data.dll!System.Data.Common.DbCommand.ExecuteReader(System.Data.CommandBehavior behavior) Unknown
EntityFramework.dll!System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(System.Data.Entity.Core.EntityClient.EntityCommand entityCommand, System.Data.CommandBehavior behavior) Unknown
EntityFramework.dll!System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlan.Execute<bool>(System.Data.Entity.Core.Objects.ObjectContext context = {System.Data.Entity.Core.Objects.ObjectContext}, System.Data.Entity.Core.Objects.ObjectParameterCollection parameterValues) Unknown
EntityFramework.dll!System.Data.Entity.Core.Objects.ObjectQuery<bool>.GetResults.AnonymousMethod__6() Unknown
EntityFramework.dll!System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction<System.__Canon>(System.Func<System.__Canon> func, System.Data.Entity.Infrastructure.IDbExecutionStrategy executionStrategy, bool startLocalTransaction, bool releaseConnectionOnSuccess = false) Unknown
EntityFramework.dll!System.Data.Entity.Core.Objects.ObjectQuery<bool>.GetResults.AnonymousMethod__5() Unknown
EntityFramework.SqlServer.dll!System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute<System.Data.Entity.Core.Objects.ObjectResult<bool>>(System.Func<System.Data.Entity.Core.Objects.ObjectResult<bool>> operation) Unknown
EntityFramework.dll!System.Data.Entity.Core.Objects.ObjectQuery<bool>.GetResults(System.Data.Entity.Core.Objects.MergeOption? forMergeOption) Unknown
EntityFramework.dll!System.Data.Entity.Core.Objects.ObjectQuery<bool>.System.Collections.Generic.IEnumerable<T>.GetEnumerator.AnonymousMethod__0() Unknown
EntityFramework.dll!System.Data.Entity.Internal.LazyEnumerator<bool>.MoveNext() Unknown
System.Core.dll!System.Linq.Enumerable.Single<bool>(System.Collections.Generic.IEnumerable<bool> source) Unknown
EntityFramework.dll!System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.GetElementFunction.AnonymousMethod__3<bool>(System.Collections.Generic.IEnumerable<bool> sequence) Unknown
EntityFramework.dll!System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.ExecuteSingle<bool>(System.Collections.Generic.IEnumerable<bool> query, System.Linq.Expressions.Expression queryRoot) Unknown
EntityFramework.dll!System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.Execute<bool>(System.Linq.Expressions.Expression expression) Unknown
EntityFramework.dll!System.Data.Entity.Internal.Linq.DbQueryProvider.Execute<bool>(System.Linq.Expressions.Expression expression) Unknown
System.Core.dll!System.Linq.Queryable.Any<ConsoleApplication31.Test>(System.Linq.IQueryable<ConsoleApplication31.Test> source) Unknown
> ConsoleApplication31.exe!ConsoleApplication31.TestClass.Test() Line 31 C#
ConsoleApplication31.exe!ConsoleApplication31.Program.Main(string[] args = {string[0]}) Line 12 C#
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.AppDomain.ExecuteAssembly(string assemblyFile, System.Security.Policy.Evidence assemblySecurity, string[] args) Unknown
Microsoft.VisualStudio.HostingProcess.Utilities.dll!Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() Unknown
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart_Context(object state) Unknown
mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Unknown
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Unknown
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) Unknown
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart() Unknown
我仍然不知道為什么會出現這個問題,但現在我知道它與我的Sql Server安裝有關。
當我使用Hyper-V中安裝的Sql Server時,一切似乎都沒問題。
當我將連接字符串更改為指向我的localhost Sql server實例時,我就會遇到這種奇怪的泄漏。
現在這對我來說是一種解決方案,至少我可以繼續前進。
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