Constant miri::borrow_tracker::stacked_borrows::stack::CACHE_LEN
source ยท const CACHE_LEN: usize = 32;
Expand description
Exactly what cache size we should use is a difficult trade-off. There will always be some
workload which has a BorTag
working set which exceeds the size of the cache, and ends up
falling back to linear searches of the borrow stack very often.
The cost of making this value too large is that the loop in Stack::insert
which ensures the
entries in the cache stay correct after an insert becomes expensive.