`<random>`: `normal_distribution` is slower than Boost
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performance
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- C++
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Description
Describe the bug
A benchmark by Alexander Neumann (original issue reporter) showed that std::normal_distribution with std::mt19937_64 was 4 times slower than boost::normal_distribution with std::mt19937_64.
Additional context
Part of the performance deficiency is due to #1000.
Also tracked by DevCom-86909 and Microsoft-internal VSO-486661 / AB#486661.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the benchmark described in the issue and read the related issue #1000. The payload names no repository files or tests and gives no target performance threshold, so investigate the existing normal_distribution implementation and benchmark setup before defining what improvement would count as done.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- performance
- Issue type
- Bug
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100