On 12/29/18, Mithun Cy <mithun...@enterprisedb.com> wrote: > Results are execution time(unit ms) taken by copy statement when number of > records equal to exact number which fit HEAP_FSM_CREATION_THRESHOLD = 4 > pages. For fill factor 20 it is till tid (3, 43) and for scale factor 70 > till tid (3, 157). Result is taken as a median of 10 runs.
> So 2-3% consistent regression, And on every run I can see for patch v11 > execution time is slightly more than base. Thanks for testing! > I also tried to insert more > records till 8 pages and same regression is observed! So I guess even > HEAP_FSM_CREATION_THRESHOLD = 4 is not perfect! That's curious, because once the table exceeds the threshold, it would be allowed to update the FSM, and in the process write 3 pages that it didn't have to in the 4 page test. The master branch has the FSM already, so I would expect the 8 page case to regress more. What I can do later is provide a supplementary patch to go on top of mine that only checks the last block. If that improves performance, I'll alter my patch to only check every other page. -John Naylor
