<p>This is already looking pretty good. For large hash_maps, the <em>parallel_flat_hash_map</em> is a very appealing solution, as it provides essentially the excellent performance of the <em>flat_hash_map</em>, while virtually eliminating the peaks of memory usage which occur when the hash table resizes.</p>
<p>But there is another aspect of the inherent parallelism of the <em>parallel_hash_map</em> which is interesting to explore. As we know, typical hashmaps cannot be modified from multiple threads withou