详细解读ASP.NET的异步

最终50个请求共产生24个线程，总用时约35.9秒。

光看数据不够形象，用简单的代码把数据转换成图形吧，下面是100个请求的处理过程。

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我们可以看到，当WEB线程长时间被占用时，请求会由于线程池而阻塞，同时产生大量的线程，最终响应时间变长。

作为对比，我们列出处理时间10毫秒的数据。

TId:6   App:44665200    Begin:41:07,9932        End:41:08,0032  TPool:2  
TId:5   App:37489757    Begin:41:07,9932        End:41:08,0032  TPool:2  
TId:5   App:44665200    Begin:41:08,0042        End:41:08,0142  TPool:2  
TId:6   App:37489757    Begin:41:08,0052        End:41:08,0152  TPool:2  
TId:5   App:44665200    Begin:41:08,0142        End:41:08,0242  TPool:2  
TId:6   App:37489757    Begin:41:08,0152        End:41:08,0252  TPool:2  
TId:5   App:44665200    Begin:41:08,0242        End:41:08,0342  TPool:2  
TId:6   App:37489757    Begin:41:08,0252        End:41:08,0352  TPool:2  
TId:5   App:44665200    Begin:41:08,0342        End:41:08,0442  TPool:2  
TId:6   App:37489757    Begin:41:08,0352        End:41:08,0452  TPool:2  
TId:5   App:44665200    Begin:41:08,0442        End:41:08,0542  TPool:2  
TId:6   App:37489757    Begin:41:08,0452        End:41:08,0552  TPool:2  
TId:5   App:44665200    Begin:41:08,0542        End:41:08,0642  TPool:2  
TId:6   App:37489757    Begin:41:08,0552        End:41:08,0652  TPool:2  
TId:5   App:44665200    Begin:41:08,0642        End:41:08,0742  TPool:2  
TId:6   App:37489757    Begin:41:08,0652        End:41:08,0752  TPool:2  
TId:5   App:44665200    Begin:41:08,0742        End:41:08,0842  TPool:2  
TId:6   App:37489757    Begin:41:08,0752        End:41:08,0852  TPool:2  
TId:5   App:44665200    Begin:41:08,0842        End:41:08,0942  TPool:2  
TId:6   App:37489757    Begin:41:08,0852        End:41:08,0952  TPool:2  
TId:5   App:44665200    Begin:41:08,0942        End:41:08,1042  TPool:2  
TId:6   App:37489757    Begin:41:08,0952        End:41:08,1052  TPool:2  
TId:5   App:44665200    Begin:41:08,1042        End:41:08,1142  TPool:2  
TId:6   App:37489757    Begin:41:08,1052        End:41:08,1152  TPool:2  
TId:5   App:44665200    Begin:41:08,1142        End:41:08,1242  TPool:2  
TId:6   App:37489757    Begin:41:08,1152        End:41:08,1252  TPool:2  
TId:5   App:44665200    Begin:41:08,1242        End:41:08,1342  TPool:2  
TId:6   App:37489757    Begin:41:08,1252        End:41:08,1352  TPool:2  
TId:5   App:44665200    Begin:41:08,1342        End:41:08,1442  TPool:2  
TId:6   App:37489757    Begin:41:08,1352        End:41:08,1452  TPool:2  
TId:5   App:44665200    Begin:41:08,1442        End:41:08,1542  TPool:2  
TId:6   App:37489757    Begin:41:08,1452        End:41:08,1552  TPool:2  
TId:5   App:44665200    Begin:41:08,1542        End:41:08,1642  TPool:2  
TId:6   App:37489757    Begin:41:08,1552        End:41:08,1652  TPool:2  
TId:5   App:44665200    Begin:41:08,1642        End:41:08,1742  TPool:2  
TId:6   App:37489757    Begin:41:08,1652        End:41:08,1752  TPool:2  
TId:5   App:44665200    Begin:41:08,1742        End:41:08,1842  TPool:3  
TId:7   App:12547953    Begin:41:08,1752        End:41:08,1852  TPool:3  
TId:6   App:37489757    Begin:41:08,1762        End:41:08,1862  TPool:3  
TId:5   App:44665200    Begin:41:08,1842        End:41:08,1942  TPool:3  
TId:7   App:12547953    Begin:41:08,1852        End:41:08,1952  TPool:3  
TId:6   App:37489757    Begin:41:08,1862        End:41:08,1962  TPool:3  
TId:5   App:44665200    Begin:41:08,1942        End:41:08,2042  TPool:3  
TId:7   App:12547953    Begin:41:08,1952        End:41:08,2092  TPool:3  
TId:6   App:37489757    Begin:41:08,1962        End:41:08,2102  TPool:3  
TId:5   App:44665200    Begin:41:08,2052        End:41:08,2152  TPool:3  
TId:7   App:12547953    Begin:41:08,2092        End:41:08,2192  TPool:3  
TId:6   App:37489757    Begin:41:08,2102        End:41:08,2202  TPool:3  
TId:5   App:44665200    Begin:41:08,2152        End:41:08,2252  TPool:3  
TId:7   App:12547953    Begin:41:08,2192        End:41:08,2292  TPool:3 

共