RFR: 8293499: Provide jmod --compress option [v6]
Aleksey Shipilev
shade at openjdk.org
Tue Sep 13 17:41:04 UTC 2022
> I have been looking into `make clean-images images` performance, and realized jmod keeps compressing files with default compression level. Tuning that toward lighter compression levels improves build performance considerably, without a heavy loss in *.jmod sizes.
>
> This PR allows JMOD to select the compression level. Follow-ups would use this in the build system, see #10214.
>
> The interesting asymmetry against `jlink` is: `jlink` provides `--compress` option that only takes `2` for "ZIP compression". (Separately, we could argue if it would be beneficial to extend `--compress` to `jlink` as well, so to select the compression level there too.)
Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
Mention the default level
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/10213/files
- new: https://git.openjdk.org/jdk/pull/10213/files/092b0ffa..2729dfb4
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=10213&range=05
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=10213&range=04-05
Stats: 4 lines in 2 files changed: 1 ins; 0 del; 3 mod
Patch: https://git.openjdk.org/jdk/pull/10213.diff
Fetch: git fetch https://git.openjdk.org/jdk pull/10213/head:pull/10213
PR: https://git.openjdk.org/jdk/pull/10213
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