RFR (S): 8145534: TestRemsetLogging.java takes a long time

Bengt Rutisson bengt.rutisson at oracle.com
Thu Dec 17 07:28:25 UTC 2015

Hi Thomas,

Thanks for fixing this!

Changes look good except that I think TestRemsetLogging.java should have 
the same @requires tag as the other tests.

@requires vm.gc=="G1" | vm.gc =="null"

Also, I think the 100 seconds runtime that you got may be related to the 
fastdebug/slowdebug issue that the changes to the configure scripts 

The numbers I reported in the bug report (18 seconds) are from my 
workstation without the slowdebug problem.

If I run with your changes I get:

elapsed time (seconds): 4.391

Which is a great improvement and an acceptable execution time I think.


On 2015-12-16 18:18, Thomas Schatzl wrote:
> Hi all,
>    can I have reviews for the following changes to gc/g1/TestRemset*
> tests that decrease its runtime significantly?
> Most of the runtime improvements come from using WhiteBox methods to
> start gcs (instead of allocating objects and waiting for it to happen),
> then forcing that test to use the interpreter (because starting up the
> compilers only slows it down), and some measures to improve startup.
> In total all this decreases fastdebug VM runtime from 100s to 17s on my
> local machine.
> The changes also add @requires tags and deletes equivalent java code.
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8145534
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8145534/webrev/
> Testing:
> looking at run times of jprt jobs which are much better now. There is
> still some variation, but they are in the same range as other tests now.
> Thanks,
>    Thomas

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