GC.GetTotalMemory メソッドとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

GC.GetTotalMemory メソッド

現在割り当てられていると思われるバイト数を取得します。このメソッドが制御を戻す前に短い時間だけ待機して、システムがガベージコレクションを行い、オブジェクトの終了操作を実行できるようにするかどうかをパラメータで示します。

名前空間: System
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public Shared Function GetTotalMemory
 ( _
    forceFullCollection As Boolean _
) As Long

Visual Basic (使用法)

Dim forceFullCollection As Boolean
Dim returnValue As Long

returnValue = GC.GetTotalMemory(forceFullCollection)

public static long GetTotalMemory (
    bool forceFullCollection
)

C++

public:
static long long GetTotalMemory (
    bool forceFullCollection
)

public static long GetTotalMemory (
    boolean forceFullCollection
)

JScript

public static function GetTotalMemory
 (
    forceFullCollection : boolean
) : long

パラメータ

forceFullCollection: Boolean 値が true である場合、このメソッドはガベージコレクションが発生するのを待機してから制御を戻すことができます。

戻り値
マネージメモリに現在割り当てられているバイト数の近似値を表す数値。

解説

forceFullCollection が true である場合、システムがガベージコレクションを行い、オブジェクトの終了操作を行うのを短い時間だけ待機します。この待機時間は、内部的に指定される制限時間で、完了したガベージコレクションのサイクル数と、サイクル間で回復するメモリ量の変化によって決定されます。ガベージコレクタは、アクセスできないすべてのメモリが収集されることは保証していません。

使用例

Visual Basic

Imports System

Namespace GCCollectInt_Example
    Class MyGCCollectClass
        Private maxGarbage As Long
 = 10000

        Public Shared Sub
 Main()
            Dim myGCCol As New
 MyGCCollectClass

            'Determine the maximum number of generations the system
            'garbage collector currently supports.
            Console.WriteLine("The highest generation is {0}",
 GC.MaxGeneration)

            myGCCol.MakeSomeGarbage()

            'Determine which generation myGCCol object is stored in.
            Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol))

            'Determine the best available approximation of the number
 
            'of bytes currently allocated in managed memory.
            Console.WriteLine("Total Memory: {0}",
 GC.GetTotalMemory(False))

            'Perform a collection of generation 0 only.
            GC.Collect(0)

            'Determine which generation myGCCol object is stored in.
            Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol))

            Console.WriteLine("Total Memory: {0}",
 GC.GetTotalMemory(False))

            'Perform a collection of all generations up to and including
 2.
            GC.Collect(2)

            'Determine which generation myGCCol object is stored in.
            Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol))
            Console.WriteLine("Total Memory: {0}",
 GC.GetTotalMemory(False))
            Console.Read()

        End Sub


        Sub MakeSomeGarbage()
            Dim vt As Version

            Dim i As Integer
            For i = 0 To maxGarbage - 1
                'Create objects and release them to fill up memory
                'with unused objects.
                vt = New Version
            Next i
        End Sub
    End Class
End Namespace

using System;

namespace GCCollectIntExample
{
    class MyGCCollectClass
    {
        private const long maxGarbage = 1000;
      
        static void Main()
        {
            MyGCCollectClass myGCCol = new MyGCCollectClass();

            // Determine the maximum number of generations the system
        // garbage collector currently supports.
            Console.WriteLine("The highest generation is {0}", GC.MaxGeneration);
            
            myGCCol.MakeSomeGarbage();

            // Determine which generation myGCCol object is stored in.
            Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol));
            
            // Determine the best available approximation of the number
 
        // of bytes currently allocated in managed memory.
            Console.WriteLine("Total Memory: {0}", GC.GetTotalMemory(false));
            
            // Perform a collection of generation 0 only.
            GC.Collect(0);
            
            // Determine which generation myGCCol object is stored in.
            Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol));
            
            Console.WriteLine("Total Memory: {0}", GC.GetTotalMemory(false));
            
            // Perform a collection of all generations up to and including
 2.
            GC.Collect(2);
            
            // Determine which generation myGCCol object is stored in.
            Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol));
            Console.WriteLine("Total Memory: {0}", GC.GetTotalMemory(false));
            Console.Read();
        }

        void MakeSomeGarbage()
        {
            Version vt;

            for(int i = 0; i < maxGarbage;
 i++)
            {
                // Create objects and release them to fill up memory
        // with unused objects.
                vt = new Version();
            }
        }
    }
}

C++

using namespace System;
const long maxGarbage = 1000;
ref class MyGCCollectClass
{
public:
   void MakeSomeGarbage()
   {
      Version^ vt;
      for ( int i = 0; i < maxGarbage; i++
 )
      {
         
         // Create objects and release them to fill up memory
         // with unused objects.
         vt = gcnew Version;

      }
   }

};

int main()
{
   MyGCCollectClass^ myGCCol = gcnew MyGCCollectClass;
   
   // Determine the maximum number of generations the system
   // garbage collector currently supports.
   Console::WriteLine( "The highest generation is {0}", GC::MaxGeneration
 );
   myGCCol->MakeSomeGarbage();
   
   // Determine which generation myGCCol object is stored in.
   Console::WriteLine( "Generation: {0}", GC::GetGeneration( myGCCol )
 );
   
   // Determine the best available approximation of the number
   // of bytes currently allocated in managed memory.
   Console::WriteLine( "Total Memory: {0}", GC::GetTotalMemory( false
 ) );
   
   // Perform a collection of generation 0 only.
   GC::Collect( 0 );
   
   // Determine which generation myGCCol object is stored in.
   Console::WriteLine( "Generation: {0}", GC::GetGeneration( myGCCol )
 );
   Console::WriteLine( "Total Memory: {0}", GC::GetTotalMemory( false
 ) );
   
   // Perform a collection of all generations up to and including 2.
   GC::Collect( 2 );
   
   // Determine which generation myGCCol object is stored in.
   Console::WriteLine( "Generation: {0}", GC::GetGeneration( myGCCol )
 );
   Console::WriteLine( "Total Memory: {0}", GC::GetTotalMemory( false
 ) );
}

package GCCollectIntExample; 

import System.* ;

class MyGCCollectClass
{
    private static final long maxGarbage =
 1000;

    public static void main(String[]
 args)
    {
        MyGCCollectClass myGCCol = new MyGCCollectClass();

        // Determine the maximum number of generations the system
        // garbage collector currently supports.
        Console.WriteLine("The highest generation is {0}", 
            System.Convert.ToString(GC.get_MaxGeneration()));
        myGCCol.MakeSomeGarbage();

        // Determine which generation myGCCol object is stored in.
        Console.WriteLine("Generation: {0}", 
            System.Convert.ToString(GC.GetGeneration(myGCCol)));

        // Determine the best available approximation of the number
 
        // of bytes currently allocated in managed memory.
        Console.WriteLine("Total Memory: {0}", 
            System.Convert.ToString(GC.GetTotalMemory(false)));

        // Perform a collection of generation 0 only.
        GC.Collect(0);

        // Determine which generation myGCCol object is stored in.
        Console.WriteLine("Generation: {0}", 
            System.Convert.ToString(GC.GetGeneration(myGCCol)));
        Console.WriteLine("Total Memory: {0}", 
            System.Convert.ToString(GC.GetTotalMemory(false)));

        // Perform a collection of all generations up to and including
 2.
        GC.Collect(2);

        // Determine which generation myGCCol object is stored in.
        Console.WriteLine("Generation: {0}", 
            System.Convert.ToString(GC.GetGeneration(myGCCol)));
        Console.WriteLine("Total Memory: {0}", 
            System.Convert.ToString(GC.GetTotalMemory(false)));
        Console.Read();
    } //main

    void MakeSomeGarbage()
    {
        Version vt;

        for (int i = 0; i < maxGarbage;
 i++) {
            // Create objects and release them to fill up memory
            // with unused objects.
            vt = new Version();
        }
    } //MakeSomeGarbage
} //MyGCCollectClass

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
GC クラス
GC メンバ
System 名前空間

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GC.GetTotalMemory メソッドとは？わかりやすく解説