Hi, On 2023-02-09 06:59:53 +0100, Laurenz Albe wrote: > On Wed, 2023-02-08 at 18:07 -0500, Rick Otten wrote: > > I've been thinking about the max_wal_senders parameter lately and wondering > > if there > > is any harm in setting it too high. > > No, there isn't, except that if you end up having too many *actual* WAL > senders, it > will cause load. A high limit is no problem as such.
That's not *quite* true. The downsides are basically the same as for max_connections (It's basically treated the same, see InitializeMaxBackends()): You need more shared memory. There's a small degradation of performance due to the increased size of some shared datastructures, most prominently the lock table for heavyweight locks. Greetings, Andres Freund
