Got it, thanks.
Regards, Zhang Mingli > On Jul 25, 2022, at 12:08, Nathan Bossart <nathandboss...@gmail.com> wrote: > > 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
