Le jeudi 22 juin 2023, 15:49:36 CEST Tom Lane a écrit : > This seems like a pretty awful idea, mainly because there's no way > to have such a GUC mean anything on non-glibc platforms, which is > going to cause confusion or worse.
I named the GUC glibc_malloc_max_trim_threshold, I hope this is enough to clear up the confusion. We already have at least event_source, which is windows specific even if it's not clear from the name. > > Aren't these same settings controllable via environment variables? > I could see adding some docs suggesting that you set thus-and-such > values in the postmaster's startup script. Admittedly, the confusion > argument is perhaps still raisable; but we have a similar docs section > discussing controlling Linux OOM behavior, and I've not heard much > complaints about that. Yes they are, but controlling them via an environment variable for the whole cluster defeats the point: different backends have different workloads, and being able to make sure for example the OLAP user is memory-greedy while the OLTP one is as conservative as possible is a worthwile goal. Or even a specific backend may want to raise it's work_mem and adapt glibc behaviour accordingly, then get back to being conservative with memory until the next such transaction. Regards, -- Ronan Dunklau
