Request for review (S): 8006398: Add regression tests for deprectated GCs

Leonid Mesnik leonid.mesnik at
Wed Feb 13 09:04:35 UTC 2013


During reviewing this I noticed that java -X was not updated. It shows:
-->/java/re/jdk/8/promoted/all/b76/binaries/linux-amd64/bin/java -X
     -Xmixed           mixed mode execution (default)
     -Xint             interpreted mode execution only
     -Xbootclasspath:<directories and zip/jar files separated by :>
                       set search path for bootstrap classes and resources
     -Xbootclasspath/a:<directories and zip/jar files separated by :>
                       append to end of bootstrap class path
     -Xbootclasspath/p:<directories and zip/jar files separated by :>
                       prepend in front of bootstrap class path
     -Xdiag            show additional diagnostic messages
     -Xnoclassgc       disable class garbage collection
*  -Xincgc           enable incremental garbage collection*
     -Xloggc:<file>    log GC status to a file with time stamps
     -Xbatch           disable background compilation
     -Xms<size>        set initial Java heap size
     -Xmx<size>        set maximum Java heap size
     -Xss<size>        set java thread stack size
     -Xprof            output cpu profiling data
     -Xfuture          enable strictest checks, anticipating future default
     -Xrs              reduce use of OS signals by Java/VM (see 
     -Xcheck:jni       perform additional checks for JNI functions
     -Xshare:off       do not attempt to use shared class data
     -Xshare:auto      use shared class data if possible (default)
     -Xshare:on        require using shared class data, otherwise fail.
     -XshowSettings    show all settings and continue
                       show all settings and continue
     -XshowSettings:vm show all vm related settings and continue
                       show all property settings and continue
                       show all locale related settings and continue

The -X options are non-standard and subject to change without notice. 
However -Xincgc warn user about deprecation.
Shouldn't we remove -Xincgc fron -X options or add warning there? Could 
we find replacement for -Xincgc instead iCMS  in JDK 8?


On 02/13/2013 12:11 PM, Bengt Rutisson wrote:
> Hi John,
> Thanks for looking at this!
> On 2/13/13 3:40 AM, Jon Masamitsu wrote:
>> Bengt,
>> Changes look good.
>> You include tests for UseG1GC and UseParallelGC (should
>> not print warnings) but not UseConcMarkSweepGC nor
>> UseSerialGC.  Why the former but not the latter?
> The is running with UseSerialGC. Am I missing 
> something or is this the test you meant?
> For CMS I think you have a point. I was kind of thinking that the test 
> TestParNewCMS was anyway testing that GC combination, but we should 
> really have a separate CMS test as well. I just added to 
> test UseConcMarkSweepGC explicitly. Here is an updated webrev:
>> Do you want to test
>> -XX:+UseConcMarkSweepGC -XX:-CMSIncrementalMode -version
>> to check that no warning is emitted?
> Hm. I don't know. If we start combining all the flags we will get into 
> an explosion of tests. I think this is a valid combination to test. 
> But in that case so are things like "-XX:+UseConcMarkSweepGC 
> -XX:-UseSerialGC". I like the way you think about this testing, I just 
> think I would like to keep these tests to be smoke testing the more 
> commonly used combinations.
> Make sense?
> Thanks again for looking at this!
> Bengt
>> Jon
>> On 2/12/2013 4:56 AM, Bengt Rutisson wrote:
>>> Hi again,
>>> Christian has pushed his test library change and it has propagated 
>>> to the hotspot-gc repository. So, this change is ready to be pushed. 
>>> Just need some reviews. Any takers? :)
>>> Thanks,
>>> Bengt
>>> On 1/16/13 1:58 PM, Bengt Rutisson wrote:
>>>> Hi all,
>>>> Could I have a couple of reviews for this change?
>>>> Recently we deprecated some GC combinations. Those should now print 
>>>> a warning at startup. Other GC combinations should not print any 
>>>> warnings.
>>>> With the new process handling support that Christian Törnqvist is 
>>>> adding to the JTREG tests for hotspot it is very easy to write test 
>>>> that start a VM and checks the output.
>>>> This changes makes use of Christian's testlibrary to verify that 
>>>> warnings are printed as expected.
>>>> I'm also adding the "gc" keyword to JTREG to make it possible to 
>>>> filter out GC tests. We should probably use this for all test in 
>>>> the the /gc folder, but I think that should be done as a separate 
>>>> change.
>>>> The webrev above is based on Christian's webrev to add the 
>>>> testlibrary:
>>>> Thanks,
>>>> Bengt

Leonid Mesnik

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