Digest calculated in batches of sizeof(size_t)

[grisumbras]

Fixes #601

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.71%. Comparing base (3c80c09) to head (55cc345).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #606   +/-   ##
========================================
  Coverage    93.70%   93.71%           
========================================
  Files           91       91           
  Lines         9136     9149   +13     
========================================
+ Hits          8561     8574   +13     
  Misses         575      575           

Files with missing lines	Coverage Δ
include/boost/json/detail/digest.hpp	100.00% <100.00%> (ø)

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[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/606/pullrequest.html

[vinniefalco]

What is the status of this?

[grisumbras]

I've made 6 variants of this and benched them. Here are the results:
https://docs.google.com/spreadsheets/d/1WEfTLx5vEb5TduzzHt-OkAj6HnS4ku4Y4Y7C3YGIgc8/edit?usp=sharing
The 6th approach seems most promising, fairly small regression for a few tests and huge improvements for many tests. But my local benchmarking disagrees with CI as you can see on the picture posted above by the bot.

[vinniefalco]

yeah the automated performance CI bot is not accurate

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/606/pullrequest.html

[vinniefalco]

FYI this is still on my radar, but I have to wait until I return to boost.http_proto.

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/606/pullrequest.html

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/606/pullrequest.html

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/606/pullrequest.html

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/606/pullrequest.html

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/606/pullrequest.html

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/606/pullrequest.html

[cppalliance-bot]

An automated preview of the documentation is available at https://606.json.prtest2.cppalliance.org/libs/json/doc/html/index.html

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/606/pullrequest.html

[grisumbras]

Abandoned in favour of #1094.