Hey all-- I’m upgrading my repo from

2.14

to

2.16

and noticed that launching

pantsd

is taking much longer than it used to (about 10 seconds). Running the command

./pants -ltrace --no-pantsd

reveals a big increase in the number of iterations of

rule_graph monomorphize

. v2.14

rule_graph monomorphize: iteration 38000: live: 8131, minimal: 7117, to_visit: 127, total: 30559

v2.16

rule_graph monomorphize: iteration 598000: live: 100589, minimal: 98377, to_visit: 246, total: 388764

(output truncated, this is just the last line from the relevant section) Is this change caused by something in my code/config or is this in the pants internals? And is there anything I can do to speed it back up?

wow, that is a drastic change! is it with the same backends enabled?? I have no clue as to why though…

yep, same backends enabled

cc @witty-crayon-22786

At the very least this sounds like unexpected behavior, should I open an issue for it?

that’s a good way to preserve the discussion and outcome, yea

mm. i expect that this had to do with introducing environments in 2.15. my hope is to simplify that algorithm via #18905 sometime this summer, so i doubt that there any quick fixes, unfortunately.

That is unfortunate, but thanks for explanation. I’ll just deal with the slow startup for now, the new features are just too good to wait any longer!