Re: WIP patch for parallel pg_dump

"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> Tom Lane <tgl@sss.pgh.pa.us> wrote:
>>> I'm still not convinced that using shared memory is a bad way to 
>>> pass these around. Surely we're not talking about large numbers
>>> of them.  What am I missing here?
>> 
>> They're not of a very predictable size.
> Surely you can predict that any snapshot is no larger than a fairly
> small fixed portion plus sizeof(TransactionId) * MaxBackends?

No.  See subtransactions.
        regards, tom lane