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You Can Do Better than std - unordered_map - New Improvements to Hash Table Performance
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- 1 Intro
- 2 Why talk about hash tables?
- 3 Performance of standard containers
- 4 Vs linear search
- 5 Why are hash tables slow?
- 6 Talk Preview
- 7 What should we measure?
- 8 Optimization 1/7: Integer Modulo
- 9 Adding ska unordered_map
- 10 Cache Miss Lookup
- 11 Optimization 2/7: Cache Misses
- 12 A simple unordered_map
- 13 Open Addressing
- 14 dense_hash_map performance
- 15 Optimization 3/7: Back to Linked Lists
- 16 ptr_hash_map performance
- 17 Optimization 4/7: Robin Hood Hashing
- 18 Robin Hood Hashing Performance
- 19 A different perspective
- 20 The memory overhead of ska::flat_hash_map
- 21 Effect of max_load_factor
- 22 Optimization 5/7: Google's New flat_hash_map
- 23 How do we make it faster?
- 24 How many bits does Robin Hood Hashing need?
- 25 Optimization 6/7: Robin Hood Hashing +SIMD
- 26 Robin Hood SIMD Performance
- 27 Chaining hash table lookups
- 28 Reminder: What ptr_hash_map looks like
