.NET???????????????

???????????? ???????[ 2013/4/19 10:32:04 ] ????????

??????????????????????????????????????????????????????????????????????????OutOfMemoryException?????????????鶴?????????к???????檔??????????????????????????????????????????????——??????????δ???????????????????.NET?????????????????????????е???棬???????????????????????????????????о????????????????????????????????????????——???????LOH??????á????????????????????????????????????????????????????ɡ?

???????????????????????????????????32λ????

????????????????????????????????????й????????????????￡?????????OutOfMemoryException???????Ч????棨????????GC Root?????????????棩??????????????2G??1G??500M??50M???????С?????????????????Ц??????????????δ???

    public class Program
     {
         static void Main(string[] args)
         {
             var smallBlockSize = 90000;
             var largeBlockSize = 1 << 24;
             var count = 0;
             var bigBlock = new byte[0];
             try
             {
                 var smallBlocks = new List<byte[]>();
                 while (true)
                 {
                     GC.Collect();
                     bigBlock = new byte[largeBlockSize];
                     largeBlockSize++;
                     smallBlocks.Add(new byte[smallBlockSize]);
                     count++;
                 }
             }
             catch (OutOfMemoryException)
             {
                 bigBlock = null;
                 GC.Collect();
                 Console.WriteLine("{0} Mb allocated"??
                     (count * smallBlockSize) / (1024 * 1024));
             }

             Console.ReadLine();
         }
     }

??????δ?????????????????С?????????????????飬???н?С??????С?90?? 000???????????????С??16M???????????????????????????15??????????????????bigBlock?????????·????????飬????????????????????????????????????OutOfMemoryException??????????????count??С??????????С? 16M + count ??????鴦????Ч?????????????????????С???????????????????

????????????????????????н??——?????????ж??????????￡????????????????δ?????????????64λ????????????????????x86??

23 Mb allocated

?????????32λ??????2G???????棬????????????????1%??

???????漴?????????????????????????????????????????????????Щ???????????????????ο?http://msdn.microsoft.com/en-us/magazine/cc534993.aspx???????????????

????.NET????????????????“Generation”??????????????G0?? G1?? G2????Generation?????????￡?????′??????????????G0??????????????????????????δ???????????????????Generation??G0 -> G1 -> G2????????????????????G2?????????????G2?С?

?????????????????????????????Generation??????????????棨?????????????????????????????????????????????????????????δ??ò???????P??????????????????????????P?????????????P?????????????????????????????????????????????????????.NET?д???????????????C??C++????д????????????——??????????????????????????????????????

??????????Generation?????????????????????????????п??????Ч??????????????????????????Ч?????е??????????????????????????????????

???????????????????????????“??????”???.NET????????????????????????????СС??85?? 000???????????С??????????????????????????????????????С??85?? 000????????????????????????????????????????????????????.NET?У????д????????????????????????????棨LOH?? Large Object Heap???е???????????????????????????G2??????????????Generation 2??????????????????LOH?????????LOH??????????????????????棡?????????LOH???????÷?????????——?????????????????????????????????LOH??β?????з??????β???????????????????????????????????????????????????????????????Ч???????μ??????????????????