I wrote:
> Heikki Linnakangas <hlinn...@iki.fi> writes:
>> I'm talking about the code that reads a bunch of from each tape, loading 
>> them into the memtuples array. That code was added by Tom Lane, back in 
>> 1999:
>> So apparently there was a benefit back then, but is it still worthwhile? 

> I'm fairly sure that the point was exactly what it said, ie improve
> locality of access within the temp file by sequentially reading as many
> tuples in a row as we could, rather than grabbing one here and one there.

[ blink... ]  Somehow, my mail reader popped up a message from 2016
as current, and I spent some time researching and answering it without
noticing the message date.

Never mind, nothing to see here ...

                        regards, tom lane

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