RFR: 8318306: java/util/Arrays/Sorting.java fails with "Array is not sorted at 8228-th position: 8251.0 and 8153.0"

[Tobias Hartmann]

On Fri, 20 Oct 2023 07:19:06 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> The goal of this PR is to address the failure of AVX512 sort test when the following JVM options are enabled (particularly `-XX:+DeoptimizeALot`) : 
>> `-Xcomp -ea -esa -XX:CompileThreshold=100 -XX:+UnlockExperimentalVMOptions -server -XX:-TieredCompilation -XX:+DeoptimizeALot`
>> 
>> ### Description of the error: 
>> The sorting test (test/jdk/java/util/Arrays/Sorting.java) usually fails as shown below (from JBS bug report):
>> 
>> [Arrays.parallelSort] 'Test with check sum' length = 10000, random = C0FFEE, m = 128, CHAR STAGGER
>> [Arrays.parallelSort] 'Test with check sum' length = 10000, random = C0FFEE, m = 128, SHORT STAGGER
>> [Arrays.parallelSort] 'Test with check sum' length = 10000, random = C0FFEE, m = 128, FLOAT STAGGER
>> ----------System.err:(25/1026)----------
>> 
>> *** TEST FAILED ***
>> 
>> Array is not sorted at 8228-th position: 8251.0 and 8153.0
>> 
>> java.lang.RuntimeException: Test failed
>> at Sorting.fail(Sorting.java:644)
>> at Sorting.checkSorted(Sorting.java:892)
>> at Sorting.checkSorted(Sorting.java:841)
>> at Sorting.checkWithCheckSum(Sorting.java:638)
>> at Sorting.testWithCheckSum(Sorting.java:438)
>> at Sorting.testBasic(Sorting.java:109)
>> at Sorting.testCore(Sorting.java:122)
>> at Sorting.testAll(Sorting.java:140)
>> at Sorting.testAll(Sorting.java:135)
>> at Sorting.main(Sorting.java:85)
>> at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
>> at java.base/java.lang.reflect.Method.invoke(Method.java:580)
>> at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
>> at java.base/java.lang.Thread.run(Thread.java:1570)
>> 
>> JavaTest Message: Test threw exception: java.lang.RuntimeException: Test failed
>> JavaTest Message: shutting down test
>> 
>> STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Test failed
>> 
>> ---------------------------------
>> ### Reproducing the error:
>> #### (1) Using test/jdk/java/util/Arrays/Sorting.java:  
>> `jtreg -jdk:$JDK_HOME/build/linux-x86_64-server-slowdebug/jdk/ -Xcomp -ea -esa -XX:CompileThreshold=100 -XX:+UnlockExperimentalVMOptions -server -XX:-TieredCompilation -XX:+DeoptimizeALot -timeoutFactor:100 -verbose:all test/jdk/java/util/Arrays/Sorting.java`
>> 
>> This failure was also reproduced independently by the author of this PR as follows:
>> **example 1:**
>> 
>> 
>> [Arrays.parallelSort] 'Test with check sum' length = 10000, random = C0FFEE, m = 2048, DOUBLE REPEATED
>> [Arrays.parallelSort] 'Test with check sum' length ...
>
> test/jdk/java/util/Arrays/SortingDeoptimizationTest.java line 26:
> 
>> 24: /*
>> 25:  * @test
>> 26:  * @build SortingDeoptimizationTest
> 
> Suggestion:
> 
>  * @test
>  * @bug 8318306

I don't think the `@build` is needed, right?

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PR Review Comment: https://git.openjdk.org/jdk/pull/16230#discussion_r1366572249