JDK 8 b118 ea test results are now available

Alan Bateman Alan.Bateman at oracle.com
Wed Dec 11 12:25:50 PST 2013

On 11/12/2013 19:50, Jonathan Gibbons wrote:
> :
> I notice in your commands, you do NOT limit the amount of memory for 
> each JVM with -Xmx.  That leaves all your JVMs using default 
> ergonomics, which may be unduly optimistic when you have lots of JVMs 
> running.
Yes, this is very important then running the jdk tests with 
-concurrency. The :jdk_core and :jdk_svc tests are okay with 
-vmoption:-Xmx256m, I have not tried anything smaller myself.

One thing that some of us don't have a handle on is the maximum number 
of VMs that are in use during a test run. It's something that Mike and I 
were chatting about recently [1]. In any case, it's the maximum number 
of VMs (and thus the memory) that really limits the concurrency. Many of 
the tests are not compute bound so you can push the concurrency (but 
only if you have the memory to do it).

One other thing to say about concurrency that auto just doesn't work on 
SPARC, just too many hardware threads.



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