Re: rfork() and copy on write

Hi Bruce,

Great! This makes sense. Thanks for the clarification.

-Jack

Walker, Bruce J (HP-Labs) wrote:
> Yes and no.  The child has the same image as the parent (as in fork) and
> any changes made by either don't effect the other (the copy of write
> semantic).  So the semantics of rfork at identical to fork.  However,
> the implementation is to copy all the pages to the new node so the
> parent and child are not physically sharing the same page.
>
> Hope that helps,
>   bruce
>  
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Jack
> de Valpine
> Sent: Tuesday, April 18, 2006 9:22 AM
> To: [email protected]
> Subject: [SSI-users] rfork() and copy on write
>
> Hi,
>
> I just want to understand the following. In a normal call to fork(), a
> child process gets started and gets a copy of the parents memory space. 
> Does rfork work in an analogous manner? So if the parent process is
> started on node 1 for example and then rforks off a series of children
> onto nodes 2 and 3 is the memory shared on a copy on write basis?
>
> Thanks,
>
> -Jack de Valpine
>
> --
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-- 
# Jack de Valpine
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# visarc incorporated
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#
# channeling technology for superior design and construction




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