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                ## 進程Process 進程(Process)是計算機中的程序關于某數據集合上的一次運行活動,是系統進行資源分配和調度的基本單位,是操作系統結構的基礎。 <br> **運用場景**: 批量任務處理。例如批量廣播 <br> **使用示例:** ``` $workers = []; echo date('Y-m-d H:i:s'); echo PHP_EOL; for($i=1;$i<5;$i++){ $process = new swoole_process(function(swoole_process $worker) use($i){ hello($i); },true); $pid = $process->start(); $workers[$pid] = $process; echo $pid.PHP_EOL; } function hello($i){ sleep(1); echo $i; } foreach($workers as $process){ echo $process->read(); } echo PHP_EOL; echo date('Y-m-d H:i:s'); ``` 需要注意`Process`進程在系統是非常昂貴的資源,創建進程消耗很大。另外創建的進程過多會導致進程切換開銷大幅上升。可以使用`vmstat`指令查看操作系統每秒進程切換的次數。
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