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When some one says Address space of a process, what exactly he means by that? PCB?

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As far as i know thread has the same address space as main process, that means there is no change in PCB for both...is it right?

posted Jun 19, 2015 by anonymous

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1 Answer

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Address space is the amount of memory allocated for all possible addresses for a process. Or in simple words Address Space refers to all memory a process can address. In general OS isolates address spaces of a process and One process can’t access another’s address space. Address space may refer physical or virtual addresses based on context.

Sample Process in the memory -
Process in Memory

Virtual to Physical Address Mapping -
Sample virtual to physical mapping

answer Jul 4, 2015 by Salil Agrawal
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Lets assume I have a system with RAM of 1GB. and virtual memory is 500MB. That brings to 1.5GB i.e. 1500 MBytes.

I have read somewhere that when I process is created stack of 8MB is associated to that process. So, assuming that any of the process is not allocating any dynamic memory or anything, then does it mean that, Maximum number of process that i can create is 1500/8 and i.e. 187 Process.

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