On 2020-02-18 11:20:17 +0530, Amit Kapila wrote: > Andres, any objections on proceeding with Kuntal's patch for > back-branches (10, 9.6 and 9.5)?
Yes. In my past experiments that lead to *terrible* allocator performance due to fragmentation. Like, up to 90% of the time spent in aset.c. Try a workload with a number of overlapping transactions that have different tuple sizes. I'm not even sure it's the right thing to do anything in the back branches to be honest. If somebody hits this badly they likely have done so before, and they at least have the choice to upgrade, but if we regress performance for more people...
