Bug ID: JDK-8292999 Review running times of langtools regression tests (umbrella)

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JDK 25
25Unresolved

4,177 of 4,348 langtools regression tests run for less than 10 seconds on a contemporary laptop. Several dozen tests run for thirty seconds to several minutes. These longer-running tests should be examined to see if their run time can be reduced or broken into pieces to run in parallel.

25 longest running tests from one regression test run (times in milliseconds):

    ./jdk/internal/shellsupport/doc/JavadocHelperTest.jtr     154158
    ./jdk/jshell/ClassMembersTest.jtr    107729
    ./jdk/jshell/ToolBasicTest.jtr    92187
    ./tools/javac/failover/CheckAttributedTree.jtr  68424
    ./tools/javac/Paths/wcMineField.jtr    66517
    ./jdk/jshell/ToolSimpleTest.jtr    61737
    ./jdk/jshell/VariablesTest.jtr    52343
    ./tools/javac/Paths/MineField.jtr    50104
    ./tools/javac/varargs/warning/Warn5.jtr    44598
    ./tools/jdeps/MultiReleaseJar.jtr    44591
    ./tools/javac/importscope/NegativeCyclicDependencyTest.jtr    43329
    ./tools/javac/lambdaShapes/org/openjdk/tests/javac/FDTest.jtr    42733
    ./jdk/jshell/FailOverExecutionControlHangingListenTest.jtr    42135
    ./jdk/jshell/FailOverExecutionControlDyingLaunchTest.jtr    42081
    ./jdk/jshell/FailOverExecutionControlHangingLaunchTest.jtr    41896
    ./tools/javac/classfiles/attributes/annotations/RuntimeParameterAnnotationsForGenericMethodTest.jtr    40792
    ./tools/javac/cast/intersection/IntersectionTypeCastTest.jtr    39886
    ./jdk/jshell/CompletionSuggestionTest.jtr    37872
    ./tools/javac/lambda/LambdaParserTest.jtr    36975
    ./tools/javac/lambda/intersection/IntersectionTargetTypeTest.jtr    35938
    ./tools/javac/tree/SourceDocTreeScannerTest.jtr 	    34639
    ./tools/javac/records/RecordCompilationTests.jtr    33367
    ./tools/javac/tree/SourceTreeScannerTest.jtr    32679
    ./tools/jdeps/listdeps/ListModuleDeps.jtr    	    32061
    ./jdk/jshell/SimpleRegressionTest.jtr    31444


The tests were extracted using a shell command like

grep "^totalTime" `find JTwork/ -name "*.jtr"` | sed s/"JTwork\/"//g | sed s/":totalTime="/" "/g | sort --n -r -t' ' -k2 | head -n 25

Relates :	JDK-8293885 - Review running times of tier 1 library regression tests (umbrella)
Relates :	JDK-8294136 - Review running times of hotspot tier 1 regression tests (umbrella)

JDK-8293000 :	Review running times of jshell regression tests - Resolved
JDK-8293003 :	Review running time of Warn5 regression test - Resolved
JDK-8293877 :	Rewrite MineField test - Resolved
JDK-8294880 :	Review running time of jdk/internal/shellsupport/doc/JavadocHelperTest.java - Resolved