RFR: 8062536: [TESTBUG] Conflicting GC combinations in jdk tests

Yekaterina Kantserova yekaterina.kantserova at oracle.com
Thu Nov 6 10:55:07 UTC 2014


If it's confusing the tests are using -XX:+UseParallelGC we can change 
them to use some other neutral flag.

"Plus there is no any sense to run test twice in TC (with different GC, 
since it use only Parallel)"

I agree it's meaningless to run them with all possible GC combinations 
because these tests are GC neutral.

// Katja



On 11/06/2014 11:27 AM, Yekaterina Kantserova wrote:
> Hi Evgeniya,
>
> As David has pointed out these jps tests are not testing gc. The 
> -XX:+UseParallelGC is just an arbitrary chosen test flag. There should 
> not be any conflicts either since these tests are running in driver mode:
>
> ...
>  * @run driver TestJpsJar
> ...
>
> which means no flags from above are accepted.
>
> Thanks,
> Katja
>
>
>
> On 11/06/2014 11:05 AM, Evgeniya Stepanova wrote:
>> Hi David,
>>
>> tag added because tests contain string
>>  cmd.addAll(JpsHelper.getVmArgs());
>>
>> and JpsHelper defines
>> ...
>> public static final String[] VM_ARGS = {"-Xmx512m", 
>> "-XX:+UseParallelGC"};
>> ...
>> public static List<String> getVmArgs() throws IOException {
>>         if (testVmArgs == null) {
>>             testVmArgs = new ArrayList<>();
>>             testVmArgs.addAll(Arrays.asList(VM_ARGS));
>>             testVmArgs.add("-XX:Flags=" + 
>> getVmFlagsFile().getAbsolutePath());
>>         }
>>         return testVmArgs;
>>     }
>>
>> Tests itself wouldn't fail if we use another GC, tag added for 
>> cleanup-if we use for example SerialGC we must be sure that tests 
>> passed with this GC, not with another one. Now you will assume that 
>> concrete test passed with Serial GC, but it run only with Parallel 
>> GC. Plus there is no any sense to run test twice in TC (with 
>> different GC, since it use only Parallel)
>>
>> Thanks,
>> Evgeniya Stepanova
>> On 06.11.2014 6:20, David Holmes wrote:
>>> Hi Evgeniya,
>>>
>>> On 6/11/2014 1:33 AM, Evgeniya Stepanova wrote:
>>>> Hi,
>>>>
>>>> Please review changes for 8062536, the OpenJDK/jdk part of the 
>>>> JDK-8019361
>>>>
>>>> bug: https://bugs.openjdk.java.net/browse/JDK-8062536
>>>> fix: http://cr.openjdk.java.net/~eistepan/8062536/webrev.00/
>>>>
>>>> Problem: Some tests explicitly set GC and fail when another GC is set
>>>> outside
>>>
>>> I don't see why you have done this for the
>>>
>>> test/sun/tools/jps/TestJps*.java
>>>
>>> tests. They don't set any GC flags.
>>>
>>>> Solution: Such tests marked with the jtreg tag "requires" to skip test
>>>> if there is a conflict
>>>
>>> Just wondering: Does a skipped test get a .jtr file showing it was 
>>> skipped; or does it only appear in the higher-level jtreg log?
>>>
>>> Thanks,
>>> David
>>>
>>>> Tested locally with different GC flags (-XX:+UseG1GC,
>>>> -XX:+UseParallelGC, -XX:+UseSerialGC, -XX:+UseConcMarkSweep and 
>>>> without
>>>> any GC flag). Tests are being excluded as expected. No tests failed
>>>> because of the conflict.
>>>>
>>>> Thanks,
>>>> Evgeniya Stepanova
>>>>
>>>> //
>>
>> -- 
>> /Evgeniya Stepanova/
>

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