Re: Trouble with hashagg spill I/O pattern and costing - Mailing list pgsql-hackers

On Thu, 2020-05-21 at 21:13 +0200, Tomas Vondra wrote:
> 1) Instead of assigning the pages one by one, we can easily extend
> the
> API to allow getting a range of blocks, so that we don't need to call
> ltsGetFreeBlock in a loop. Instead we could call ltsGetFreeBlockRange
> with the requested number of blocks.

ltsGetFreeBlock() just draws one element from a minheap. Is there some
more efficient way to get many elements from a minheap at once?

>  And we could keep just a min/max
> of free blocks, not an array with fixed number of elements.

I don't quite know what you mean. Can you elaborate?

Regards,
    Jeff Davis