Document impact of enabling parking_lot

matklad / once_cell

Rust library for single assignment cells and lazy statics without macros

Apache License 2.0

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Closed najamelan closed 5 years ago

najamelan commented 5 years ago

It's obvious that this will add more dependencies, but what is the advantage?

If it's for performance, are there any benchmarks showing the difference?

matklad commented 5 years ago

Good call!

At the moment:

there’s no perf difference for hot path
using parking lot makes sizes of struct a smaller
(until https://github.com/matklad/once_cell/pull/39 is released) it enables get_or_try_init

najamelan commented 5 years ago

Ok thanks a lot for clarifying. I will stick to the std version then, because the keeping the dependency tree small is more important for me.

matklad commented 5 years ago

The recent release includes both #39 and some docs about parking lot effects!