[build-script-impl] Optimize setting -> variable name lookups.#2847
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gribozavr merged 1 commit intoswiftlang:masterfrom Jun 3, 2016
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- The current behavior of mapping via `tr` was very slow when called over and
over for each option. This matters for SR-237 where I would like
`build-script` to take over the top-level build process control loop, which
involves executing `build-script-impl` multiple times.
- This patch optimizes the lookup in two ways:
1. It does the setting to variable conversion in a single pass, for all
options at once.
2. It builds a cache of the setting to variable name conversion (as an
exploded associate array), and uses that when doing variable assignment.
- This patch speeds up `build-script-impl --dry-run` by 2x on one test case.
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/cc @gribozavr @swift-ci please smoke test |
1 task
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LGTM! |
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What's in this pull request?
This optimizes
build-script-impl's setting processing code (which was adding about 1s to each invocation, on my machine). See commit for details.Related to SR-237.
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trwas very slow when called over andover for each option. This matters for SR-237 where I would like
build-scriptto take over the top-level build process control loop, whichinvolves executing
build-script-implmultiple times.options at once.
exploded associate array), and uses that when doing variable assignment.
build-script-impl --dry-runby 2x on one test case.