This should help to speed up tests significantly. Currently, if we run "make test" with a subset of tests, JTReg would still read the entirety of test root to report on tests that were not run. Even with current suite of tests it gets expensive. If you add more tests to suite -- for example, mounting a large test archive like pre-generated fuzzer tests -- it starts to take a lot of time.
The reasonable default for older jtreg is `-report:executed`. My own CI -- that has millions of tests mounted in `test/` -- was running with `JTREG="OPTIONS=-report:executed"` for years now. I think that should be the default way to run the tests in JDK tree. [CODETOOLS-7903323](https://bugs.openjdk.org/browse/CODETOOLS-7903323) provides a new reporting option, `-report:files`, which makes this whole business easier. This requires new jtreg. Motivational improvements: $ time CONF=linux-x86_64-server-release make run-test TEST=gc/epsilon/TestHelloWorld.java # Default JDK tree # Baseline real 0m9.086s user 0m22.857s sys 0m4.202s # Patched real 0m6.406s ; +40% faster user 0m17.156s sys 0m3.193s # +100K fuzzer tests in tree # Baseline real 3m1.997s user 3m16.643s sys 0m10.490s # Patched real 0m8.919s ; 20x faster user 0m17.904s sys 0m4.860s Additional testing: - [x] Ad-hoc timing tests (see above) - [x] Reproducer from [CODETOOLS-7903331](https://bugs.openjdk.org/browse/CODETOOLS-7903331) - [x] Eyeballing the test results on passing tests with REPEAT_COUNT > 1 - [x] Eyeballing the test results on intermittently failing tests with RETRY_COUNT > 1 ------------- Commit messages: - Fix Changes: https://git.openjdk.org/jdk/pull/11824/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11824&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8294403 Stats: 12 lines in 3 files changed: 11 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/11824.diff Fetch: git fetch https://git.openjdk.org/jdk pull/11824/head:pull/11824 PR: https://git.openjdk.org/jdk/pull/11824
