Python进程池如何创建子进程?
python进程池无法创建子进程的解决之道
在多任务处理中,使用进程池能有效避免系统进程数量限制。然而,当特定任务需要子进程创建子进程时,使用进程池可能会受限。本文将探讨如何在进程池中实现子进程创建子进程。
在给定的python代码中,print_log()函数试图在进程池中创建子进程,但由于以下原因失败:
要解决此问题,有以下几种方法:
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1. 使用multiprocessing.manager()
2. 使用concurrent.futures.threadpoolexecutor()
import concurrent.futuresdef print_run(msg): print('msg.%s' % msg) time.sleep(2)def print_log(msg): with concurrent.futures.threadpoolexecutor() as executor: future = executor.submit(print_run, msg) future.result() print('msg is : %s' % msg) time.sleep(1)if __name__ == '__main__': for i in range(20): print_log(str(i))
3. 使用subprocess.popen()
import subprocessdef print_run(msg): print('msg.%s' % msg) time.sleep(2)def print_log(msg): p = subprocess.Popen(['python', '-c', 'import time; time.sleep(2); print("msg.%s")' % msg]) p.wait() print('msg is : %s' % msg) time.sleep(1)if __name__ == '__main__': for i in range(20): print_log(str(i))
通过以上方法,可以在进程池中实现子进程创建子进程,从而满足特定的任务需求。