On Sun, Jul 24, 2022 at 12:48:25PM +0800, Zhang Mingli wrote: > If snaphost->suboverflowed is false then the subxcnt must be less than > PGPROC_MAX_CACHED_SUBXIDS which is 64 now. > > And we won’t use hash if the xcnt is less than XIP_HASH_MIN_ELEMENTS which is > 128 currently during discussion. > > So that, subxid’s hash table will never be used, right?
This array will store up to TOTAL_MAX_CACHED_SUBXIDS transactions, which will typically be much greater than 64. When there isn't any overflow, subxip stores all of the subxids for all of the entries in the procarray. -- Nathan Bossart Amazon Web Services: https://aws.amazon.com
