Re: parallel pg_restore - WIP patch

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От Andrew Dunstan
Тема Re: parallel pg_restore - WIP patch
Дата
Msg-id 48DCE2B0.4060101@dunslane.net
обсуждение исходный текст
Ответ на Re: parallel pg_restore - WIP patch  (Russell Smith <mr-russ@pws.com.au>)
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Russell Smith wrote:
> I'm sorry, I meant processes there.  I'm aware there are no threads. 
> But my feeling was that when you forked with open files you got all of
> the open file properties, including positions, and as you dupped the
> descriptor, you share all that it's pointing to with every other copy of
> the descriptor.  My brief research on that shows that in 2005 there was
> a kernel mailing list discussion on this issue. 
> http://mail.nl.linux.org/kernelnewbies/2005-09/msg00479.html was quite
> informative for me.  I again could be wrong but worth a read.  If it is
> true, then the file needs to be reopened by each child, it can't use the
> duplicated descriptor.  I haven't had a change to implementation test is
> as it's late here.  But I'd take a stab that it will solve the
> compression library problems.
>
> I hope this helps, not hinders
>
>
>   

I'm sure that's the problem. Should be fairly easily fixable, I believe.

Thanks for the info.

cheers

andrew


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