Hi, On 2022-11-24 10:43:46 +0530, Bharath Rupireddy wrote: > While working on something else, I noticed that the proc array group > XID clearing leader resets procArrayGroupNext of all the followers > atomically along with procArrayGroupMember. ISTM that it's enough for > the followers to exit the wait loop and continue if the leader resets > just procArrayGroupMember, the followers can reset procArrayGroupNext > by themselves. This relieves the leader a bit, especially when there > are many followers, as it avoids a bunch of atomic writes and > pg_write_barrier() for the leader .
I doubt this is a useful change - the leader already has to modify the relevant cacheline (for procArrayGroupMember). That makes it pretty much free to modify another field in the same cacheline. Greetings, Andres Freund
