epp">sparsepp</a> or Google's <a href="https://code.google.com/archive/p/cpp-btree/">cpp-btree</a>.</p>
<p>When the Abseil library was open sourced, I started pondering the issue again. Compared to Google's old dense_hash_map which resized at 50% capacity, the new <em>absl::flat_hash_map</em> resizing at 87.5% capacity was more memory friendly, but it still had these significant peaks of memory usage when resizing.</p>
<p>If only there was a way to eliminate those peaks, the <em>flat_hash_map</em> would be 