## CACHE_LEN

# Constant CACHE_LEN

Source

    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.