Hi, On Tue, Feb 04, 2025 at 01:23:28PM -0600, Sami Imseih wrote: > I confirmed the 20GB value as is described here [1]. > 8k page can hold 409 member groups and each > member group can hold 4 members, thus > (2^32/(409 *4))*8192 = 20GB. >
Thanks for the patch! I do agree that that's a bug in the doc. Indeed, while I do agree that MULTIXACT_MEMBER_SAFE_THRESHOLD can be seen as "2G" (not 2GB...) then it's compared in MultiXactMemberFreezeThreshold() to "members" which is the number of members: So, the member's size has to be taken into account. Maybe we could also add a comment in multixact.c to update the doc accordingly if the computation changes? (I think that will be easy to miss). Regards, -- Bertrand Drouvot PostgreSQL Contributors Team RDS Open Source Databases Amazon Web Services: https://aws.amazon.com
