`std::endl` is expensive
Open
Nobody has claimed this yet.
- Dominant language
- C++
- Stars
- 248
- Forks
- 72
- Avg merge
- 1d 16h
- Merged PRs (30d)
- 15
Description
Using std::endl to terminate a line is expensive. See e.g. https://en.cppreference.com/w/cpp/io/manip/endl. std::endl flushes the stream, and this can be quite expensive, especially when the output is redirected to a file on a shared file system.
Contributor guide
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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
Search the repository for uses of std::endl and inspect the affected output paths, especially those that may write to shared filesystems. Determine which uses can avoid flushing while preserving required output behavior, then run the repository's available test suite to verify that output remains correct and the unnecessary flushes are removed.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- hpc, performance
- Issue type
- Refactor
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100