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                            ### 線程估算公式

#### _**線程啟動數 = \[任務執行時間 / \(任務執行時間 - IO等待時間\)\] \* CPU內核數**_

最佳啟動線程數和CPU內核數量成正比，和IO阻塞時間成反比；

如果是CPU計算密集型任務，那么線程數最多不超過CPU內核數，因為啟動再多線程，CPU也來不及調度；

如果是IO操作，那么多啟動線程有助于提高任務并發度，提高系統吞吐能力，改善系統性能；


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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