It was previously on always, but this now disables it by default. Do we want to change that? The release manager guide probably needs an update as well.

I figure the script should reflect the way memory grows in matplotlib, and subsequent to #23712 that means not interfering with gc heuristics.

I left the gc option available since it now takes a while to observe the long term trend and someone may want to smooth out the gc bumps for a short term measurement.

For context, the output is actually quite qualitatively different (I did a shorter 100 test rather than the standard from the release docs which is 1000, but still)

Without explicit gc.collect:

With explicit gc.collect:

So, without calling gc.collect, memory usage is higher and pymalloc/total objects oscillate with a period of ~4.
While calling gc.collect, memory usage and number of objects grow fairly linearly. (iirc they do plateau off further in, but takes longer to get to that plateau at least for rss)