FW: is this a bug ?

[Yangfei (Felix)]

> -----Original Message-----
> From: Aleksey Shipilev [mailto:shade at redhat.com]
> Sent: Wednesday, October 16, 2019 9:54 PM
> To: Yangfei (Felix) <felix.yang at huawei.com>; jcstress-dev at openjdk.java.net
> Cc: Andrew Haley <aph at redhat.com>
> Subject: Re: FW: is this a bug ?
> 
> "-XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-RestrictContended
> -XX:ReservedCodeCacheSize=128M" does not make sense in this context:
> jcstress would fork the JVMs and set up their own command line options,
> enabling WhiteBoxAPI and @Contended along the way.

Yes, I also noticed this issue when I was offered this command.  

> It looks like heap overflow, which is not surprising, given the ByteBuffer tests
> and the very old jcstress, which misses at least this fix:
>   https://hg.openjdk.java.net/code-tools/jcstress/rev/0eecf3f89210

OKAY. 

> > Note that I am using an old jcstress version in order to run it with a 8u jdk.  I
> execute " hg update -r 0de8079ec104 " to get the old version.
> 
> Why? Current jcstress requires JDK 11 to build, but it can run with JDK 8 (it
> would yield some "soft errors" on tests that are not executable with JDK 8).

I think that affects our testing team and makes them go back to the old version for 8u testing purpose.  
Let me communicate with them about that.  

> 0de8079ec104 is very, very, very old and misses many important harness and
> test fixes.
>
> I took the today's build of jcstress:
>   https://builds.shipilev.net/jcstress/jcstress-tests-all-20191016.jar
> 
> ...and today's 8u232:
> 
> https://builds.shipilev.net/openjdk-jdk8/openjdk-jdk8-latest-linux-x86_64-releas
> e.tar.xz
> 
> ...and it runs to completion:
> 
> $ jdk8u232/bin/java -jar jcstress.jar -t
> ByteBufferViewsAtomicityTests.LongViewTest -time 50000
> 

The latest jcstress version works for me too.  We will switch to the latest jcstress version for 8u testing.  
Thanks for the clarification.  It is very helpful.  

Felix