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Here's some btree microbenchmarks, taken September 2023, on a Ryzen 5950X,
turbothreading and hyperthreading off:
rand_insert: 10M with 1 threads in 15 sec, 1480 nsec per iter, 660K per sec
rand_insert: 10M with 16 threads in 4 sec, 6330 nsec per iter, 2.41M per sec
rand_lookup: 10M with 1 threads in 7 sec, 736 nsec per iter, 1.29M per sec
rand_lookup: 10M with 16 threads in 0 sec, 1165 nsec per iter, 13.1M per sec
rand_insert: 100M with 1 threads in 165 sec, 1573 nsec per iter , 621K per sec
rand_insert: 100M with 16 threads in 31 sec, 4849 nsec per iter, 3.15M per sec
rand_lookup: 100M with 1 threads in 89 sec, 851 nsec per iter, 1.12M per sec
rand_lookup: 100M with 16 threads in 6 sec, 973 nsec per iter, 15.7M per sec
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