Ben Kietzman created ARROW-10625:
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Summary: [C++] Optimize Future<> creation
Key: ARROW-10625
URL: https://issues.apache.org/jira/browse/ARROW-10625
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Affects Versions: 2.0.0
Reporter: Ben Kietzman
Assignee: Ben Kietzman
Fix For: 3.0.0
{{Future<>}} is more expensive to construct than necessary. A few optimizations
could be pursued:
- Store the future's result in the same allocation which houses the
ConcreteFutureImpl
- Apply the small buffer optimization to FnOnce so that small continuations do
not incur another heap allocation
- Contention for the global waiter lock is unlikely to be an issue, but it'd be
good to measure
- Futures will usually have few callbacks, so a vector may be unnecessary
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