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多个进程是否可以同时仅从 Python 中的文件读取（不写入）？

[英]Is it possible for multiple processes to simultaneously only read (not write to) from a file in Python?

原文 2020-07-10 05:38:29 2 1 python/ python-3.x/ python-multiprocessing

I have spawned multiple processes using multiprocessing.Process in a loop and each process is trying to read the same file.我在一个循环中使用 multiprocessing.Process 生成了多个进程，并且每个进程都试图读取同一个文件。 Will this cause an issue?这会引起问题吗？ References to the answers are most welcome.非常欢迎参考答案。

1 个解决方案

It's no problem.没问题。 Not only applies to files, also to RAM.不仅适用于文件，也适用于 RAM。 You only get in trouble when someone is writing.只有当有人在写作时，你才会遇到麻烦。

The phenomenon is called a data race (emphasis mine):这种现象被称为数据竞赛（强调我的）：

access [==read] a memory location at the same time that a memory operation in another thread is writing to that memory location访问[==read] 一个 memory 位置，同时另一个线程中的 memory 操作正在写入该 memory 位置

同时读取和写入Python和C文件 - Python and C file read/write simultaneously

Python：从多个进程（ZMQ）写入单个文件 - Python: write to single file from multiple processes (ZMQ)

Python同时运行多个进程 - Python Running multiple processes simultaneously

如何在Python 2中从并行进程读取和共享并同时处理数据？ - How to read and share and process simultaneously data from parallel processes in Python 2?

Python：同时运行多个进程 - Python: running multiple processes simultaneously

使用本地共享读/写存储（文件/数据库）作为多个 python 脚本/进程的缓存的便携式方式 - Portable way to use a local shared read/write storage (file/database) as a cache for multiple python scripts/processes

是否可以在一个文件中读写多个DataFrame？ - Is it possible to write and read multiple DataFrames to/from one single file?

如何在多个进程尝试写入然后同时从文件读取时防止竞争条件 - How to prevent a race condition when multiple processes attempt to write to and then read from a file at the same time

如何在python中同时以读写方式打开腌制文件？ - How to open a pickled file in both read and write simultaneously in python?

使用pickle在python多进程读写文件 - Using pickle to write and read files in python with multiple processes

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