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                * python語言和GIL沒有關系,僅僅是由于歷史原因在Cpython虛擬機,難以移除GIL; * GIL:全局解釋器鎖。每個線程在執行的過程都需要先獲取GIL,保證同一時刻只有一個線程可以執行代碼; * 線程釋放GIL鎖的情況:在IO操作等可能會引起阻塞的system call之前,可以暫時釋放GIL,但在執行完畢后,必須重新獲取GIL,Python3使用計時器; * Python使用多進程是可以利用多核的CPU資源的; * 多線程爬取比單線程性能有提升,因為遇到IO阻塞會自動釋放GIL鎖;
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