8278434: timeouts in test java/time/test/java/time/format/TestZoneTextPrinterParser.java

[naotoj]

The proposed fix is to address the performance degradation caused by the fix to JDK-8275721. Some amount of the degradation cannot be avoided as the lookup now falls back up to the bundles at Locale.ROOT. However, by lowering the fallback priority of regionFormatFallback than COMPAT's lookup, it can avoid the excess bundle lookups for regions.
I also changed the test case TestZoneTextPrinterParser.java, which currently iterates over 3 nested loops, i.e., all-locales x all-timezones x 8, which is absolutely unnecessary. Made it to sample some locales.
In addition, I added a microbenchmark for the DateFormatSymbols.getZoneStrings() method. Here is the result:

Before the fix to JDK-8275721:

Benchmark                    Mode  Cnt  Score   Error  Units
ZoneStrings.testZoneStrings    ss    5  6.865 ± 0.696   s/op

Before the proposed fix:

Benchmark                    Mode  Cnt   Score   Error  Units
ZoneStrings.testZoneStrings    ss    5  15.741 ± 4.300   s/op

After the proposed fix:

Benchmark                    Mode  Cnt  Score   Error  Units
ZoneStrings.testZoneStrings    ss    5  9.756 ± 3.685   s/op

---

Progress

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Issue

• JDK-8278434: timeouts in test java/time/test/java/time/format/TestZoneTextPrinterParser.java

Reviewers

• Joe Wang (@JoeWang-Java - Reviewer)

Reviewing

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[openjdk]

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[mlbridge]

Webrevs

• 01: Full - Incremental (5f38bd13)
• 00: Full (f14f5450)

[JoeWang-Java]

It’s nice to see you’ve got most of the performance back. Hope looping through Zone strings isn't really necessary.

[openjdk]

@naotoj This change now passes all automated pre-integration checks.

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8278434: timeouts in test java/time/test/java/time/format/TestZoneTextPrinterParser.java

Reviewed-by: joehw

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At the time when this comment was updated there had been 1 new commit pushed to the master branch:

• 6b906bb: 8279223: Define version in .jcheck/conf

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[naotoj]

Hope looping through Zone strings isn't really necessary.

Thanks, Joe. IMHO, DateFormatSymbols.getZoneStrings() is badly designed. It just simply exposes the names in the underlying ResourceBundle, and I cannot think of any use cases for this method, rather than using ZoneId or TimeZone's display names retrieval methods.

[naotoj]

/integrate

[openjdk]

Going to push as commit 8dc4437.
Since your change was applied there has been 1 commit pushed to the master branch:

• 6b906bb: 8279223: Define version in .jcheck/conf

Your commit was automatically rebased without conflicts.

[openjdk]

@naotoj Pushed as commit 8dc4437.

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