Thursday, September 18, 2008

Re: [HACKERS] FSM patch - performance test

Heikki Linnakangas <> writes:
> Zdenek Kotala wrote:
>> My conclusion is that new implementation is about 8% slower in OLTP
>> workload.

> Thanks. That's very disappointing :-(

One thing that jumped out at me is that you call FreeSpaceMapExtendRel
every time a rel is extended by even one block. I admit I've not
studied the data structure in any detail yet, but surely most such calls
end up being a no-op? Seems like some attention to making a fast path
for that case would be helpful.

regards, tom lane

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