Ramki,

Can you do the following to be sure that hotspot did not take the parameter?
java -XX:ConcGCThreads=1 -XX:+PrintFlagsFinal

I am using jdk9b154, the output shows it changed the ConcGCThreads to 1

Thanks
Jenny

On 4/17/2017 4:33 PM, Ram Krishnan wrote:
Many thanks Jonathan for the immediate reply.

I am copying the hotspot gc team.

Hotspot gc team -- your help would be much appreciated on the topic below.

Thanks,
Ramki

On Mon, Apr 17, 2017 at 2:29 PM, Jonathan Gibbons <jonathan.gibb...@oracle.com <mailto:jonathan.gibb...@oracle.com>> wrote:



    On 04/17/2017 02:18 PM, Ram Krishnan wrote:
    Hi,

    I have been able to successfully run all the tests in
    hotspot/test/gc/g1 using jtreg.

    The only gotcha I am facing is that the JVM startup options
    specified in process builder does not have any effect. I have
    confirmed this through prints in the JVM code base.

    For example,
    ​/hotspot/test/gc/g1/​
    TestEagerReclaimHumongousRegionsClearMarkBits.java modifies the
    "-XX:ConcGCThreads=1", but inside the JVM code to value of
    ConcGCThreads is still zero.

    ​I am new to jtreg and openjdk and probably missing something
    obvious. Your help would be much appreciated.

    Thanks in advance,​
    ​Ramki​


    Ramki,

    This does not look like an issue with jtreg, since the behavior
    you are apparently seeing is all within the test code and its
    libraries.

    You might want to follow up with the Hotspot team, who would have
    more familiarity with these tests and the associated libraries.

    -- Jon




--
Thanks,
Ramki

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