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From: Benedict Bede McNamara (benedict_at_[hidden])
Date: 2022-08-02 22:30:39

It appears that the main fact determining collection build speed is the heap you use. I++ now uses its own binary heap to perform allocations for the collection forward_list (which is what oarchive uses). So binary serialization goes even faster now. Here are some figures for collections with a million elements:

stl list build time is: 0:0:0:0:27
stl list sort time is: 0:0:0:0:21
stl forward_list build time is: 0:0:0:0:20
stl forward_list sort time is: 0:0:0:0:20
stl set build time is: 0:0:0:0:111
I++ set build time is: 0:0:0:0:61
stl unordered_set build time is: 0:0:0:0:149
stl map build time is: 0:0:0:0:118
I++ dictionary build time is: 0:0:0:0:60
Linked list build time is: 0:0:0:0:23
Linked list sort time is: 0:0:0:0:23
Forward list build time is: 0:0:0:0:16
Forward list sort time is: 0:0:0:0:17
I++ serialization/deserialization time is: 0:0:0:0:150
list build time is: 0:0:0:0:74
stl vector build time is: 0:0:0:0:5
Vector sort time is: 0:0:0:0:12
Quick Sort time is: 0:0:0:0:10
heap allocations: 12000007
heap allocations: 0

>From this we see that in general binary serialization/deserialization takes a bit longer than collection allocation. For example the serialization/deserialization time is 150 milliseconds for a million elements whereas forward_list only takes 16 milliseconds to build. I would be interested to see what the equivalent figures are for Boosts text based serialization.

Yours Sincerely,
Benedict Bede McNamara

P.S. The program that produced these figures is attached.

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