[11] RFR(S): 8207067: [test] prevent timeouts in serviceability/tmtools/jstat/{GcTest02, GcCauseTest02}.java

Volker Simonis volker.simonis at gmail.com
Wed Jul 11 17:30:09 UTC 2018

can I please have a review for the following test fix which prevents
eventual test timeouts:


The two tests hotspot/jtreg/serviceability/tmtools/jstat/{GcTest02,GcCauseTest02}.java
produce more than 90_000 classes until they eat up ~70% of the 128M
meta space they run with. The loading of each of these classes
triggers a full dependency check for ALL nmethods in debug/fastdebug
builds because 'VerifyDependencies' is 'true' there. This slows down
the tests from about 3 sec. in the opt build to about 88 sec. in the
fastdebug build on x86_64 and from about 4 sec. to about 560 sec. on

Because the tests are not about dependency checking, it makes sense to
switch of 'VerifyDependencies' if they are run inside a
debug/fastdebug VM and decrease the execution time down to about 6
sec. on both x86_64 and ppc64.

Thank you and best regards,

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