问题描述
我发现了这个为什么多个进程具有相同的python中的对象ID ，但是我不太明白这是什么意思因为两个进程都执行相同的代码"，所以我尝试了一下代码，似乎输出始终是相同的.
I found this why multiple processes have the same object id in python, but I do not quite understand what does it mean "because both processes execute the same code", I try the code, it seems the outputs are always the same.
➜ ~ python test2.py44190856964419085696➜ ~ python test2.py43428304644342830464➜ ~ python test2.py45101561604510156160➜ ~ python test2.py43299485444329948544➜ ~ python test2.py44680042244468004224➜ ~ python test2.py43266471684326647168➜ ~ python test2.py44457383684445738368➜ ~ python test2.py43889800964388980096➜ ~ python test2.py45119993604511999360➜ ~ python test2.py45628512004562851200➜ ~ python test2.py45350311684535031168➜ ~ python test2.py43144206084314420608➜ ~ python test2.py45360346884536034688
➜ ~ python test2.py44190856964419085696➜ ~ python test2.py43428304644342830464➜ ~ python test2.py45101561604510156160➜ ~ python test2.py43299485444329948544➜ ~ python test2.py44680042244468004224➜ ~ python test2.py43266471684326647168➜ ~ python test2.py44457383684445738368➜ ~ python test2.py43889800964388980096➜ ~ python test2.py45119993604511999360➜ ~ python test2.py45628512004562851200➜ ~ python test2.py45350311684535031168➜ ~ python test2.py43144206084314420608➜ ~ python test2.py45360346884536034688
我也找到了这个参考 http://code.activestate.com/lists /python-list/656748/在网络上.似乎python多个进程共享同一个对象.
I also find this refer http://code.activestate.com/lists/python-list/656748/ on web. It also seems that python multiple processes shares the same object.
有人可以帮助进一步解释吗?提前致谢.
Anyone could help to explain a bit further? Thanks in advance.
推荐答案
CPython中对象的id是对象内存地址，由进程本身看到..该操作系统可防止其他进程看到其他进程的内存.
The id of an object in CPython is the objects memory address as seen by the process itself. The OS prevents different processes from seeing other processes memory.
严重简化警告就每个进程而言，其内存空间从0开始并增加.启动并要求操作系统提供1000字节内存块的两个不同进程都将认为它们具有0-1000内存块，但实际上并没有共享内存.
Gross simplification warning As far as each process is concerned, its memory space starts at 0 and goes up. Two different processes that start up and ask for a 1000-byte block of memory from the OS will both think they have memory block 0-1000, but they are not actually sharing memory.
请参见 https://en.wikipedia.org/wiki/Virtual_address_space 简介和更好的解释.
See https://en.wikipedia.org/wiki/Virtual_address_space for a good intro and better explanation.
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