not sure if this was spotted already, but when trying to use the JVM memory controls in 2.12rc0 with following settings:

process_total_child_memory_usage = "6GiB"
process_per_child_memory_usage = "1GiB"

Pants exits with following error after doing some work:

Exception: Failed to connect to nailgun! No idle slots in nailgun pool.

It seems that the process fingerprinting and LRU logic in

<http://nailgun_pool.rs|nailgun_pool.rs>

would need to have some tweaking, but I’m speculating

sorry for the trouble here! commented on https://github.com/pantsbuild/pants/issues/15808 with a workaround. i’ll see if i can get a fix out today.

no worries, we all are too busy, created the ticket so it would no be forgotten.