archive cache is not freed after use

[gdt]

Memory management in an OS is complicated, generally involving both paging out process memory and freeing memory used for caching. There are generally not mechanisms to purge in-process caches. Unison keeps caches of the archive in repeat mode.

This is a defect ticket that retaining significant amounts of cache memory indefinitely is not ok. A fix would involve freeing it, perhaps after some minute-level interval (to be analzyzed), so that a quiescent unison process doesn't have large allocations.