RFR(xs): 8186402: [TESTBUG] "Balance queues" output expected by test

[Alexander Harlap]

Good change.

Alex


On 8/18/2017 4:17 PM, sangheon.kim wrote:
> Hi all,
>
> Could I have some reviews for this tiny change of adding 
> ParallelGCThreads=2 in TestPrintReferences.java?
>
> The test is assuming always to have 'Balance queues:' log but it is 
> only generated when the VM did queue balancing. Queue balancing 
> happens when MT process is enabled(with 
> +ParallelRefProcBalancingEnabled) or MT discovery is enabled. And MT 
> discovery is enabled if we have multiple ParallelGCThreads (> 1).
>
> Adding explicit thread setting of 'ParallelGCThreads=1' is easiest way 
> to avoid this test failure on limited environments. i.e. machines 
> which determine to use 1 ParallelGCThreads.
>
> The test failure log also includes:
> "[Java HotSpot(TM) 64-Bit Server VM warning: If the number of 
> processors is expected to increase from one, then you should configure 
> the number of parallel GC threads appropriately using 
> -XX:ParallelGCThreads=N"
>
> CR: https://bugs.openjdk.java.net/browse/JDK-8186402
> Webrev: http://cr.openjdk.java.net/~sangheki/8186402/webrev.0/
> Testing: JPRT
>
> Thanks,
> Sangheon

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