Re: [HACKERS] postgres_fdw cost estimation defaults and documentation

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От Jim Finnerty
Тема Re: [HACKERS] postgres_fdw cost estimation defaults and documentation
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Msg-id 1496798660063-5965199.post@n3.nabble.com
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Ответ на Re: [HACKERS] postgres_fdw cost estimation defaults and documentation  (Robert Haas <robertmhaas@gmail.com>)
Ответы Re: [HACKERS] postgres_fdw cost estimation defaults and documentation  (Robert Haas <robertmhaas@gmail.com>)
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In some MPP systems, networking costs are modeled separately from I/O costs,
processor costs, or memory access costs.  I think this is what Ashutosh may
have been getting at with /per-packet/ costs:  in a more sophisticated fdw
cost model there could be a  network cost per /packet/ that would be
independent of the cost of reading the next page or a random page from local
storage.



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