On Sun, Feb 13, 2022 at 1:34 AM Dilip Kumar <dilipbalaut@gmail.com> wrot>
> test4:
> 32 GB shared buffers, template DB size = 10GB, dirty shared buffer=70%
> Head: 47656 ms
> Patch: 79767 ms
This seems like the most surprising result of the bunch. Here, the
template DB is both small enough to fit in shared_buffers and small
enough not to trigger a checkpoint all by itself, and yet the patch
loses.
Did you checkpoint between one test and the next, or might this test
have been done after a bunch of WAL had already been written since the
last checkpoint so that the 10GB pushed it over the edge?
BTW, you have test4 twice in your list of results.
--
Robert Haas
EDB: http://www.enterprisedb.com