RFR (XS): 8059527: Disallow ParallelGCThreads=0 for G1

Erik Helin erik.helin at oracle.com
Wed Oct 1 14:48:54 UTC 2014

Hi Marcus,

a couple of comments:

- src/share/vm/runtime/arguments.cpp:
   Could you use vm_exit_during_initialization instead of vm_exit?
   This way, the error message will be printed in a uniform way and the
   VM will also run all shutdown functions (such as os::shutdown,
   os::abort etc).

- test/gc/arguments/TestParallelGCThreads.java
   + * @build TestParallelGCThreads FlagsValue
   I don't believe this line is needed, jtreg should automically build
   your files

   + * @run main/othervm TestParallelGCThreads
   Please use `@run driver` instead of `@run main/othervm`. You can use
   'driver' because your tests creates its own processes.

   Please use assertions from the testlibrary instead of throwing a

- Please update hotspot/test/TEST.groups to include your new test for
   needs_g1gc, needs_parallelgc and needs_cmsgc


On 2014-10-01 15:22, Marcus Larsson wrote:
> Hi,
> Can I have reviews for the following small patch disallowing
> ParallelGCThreads to be 0 when G1 is used? Also included a small test to
> verify that the VM will not start if the count is 0 for parallel
> collectors (G1, CMS+ParNew and ParallelGC).
> Webrev:
> http://cr.openjdk.java.net/~mlarsson/8059527/webrev.00/
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8059527
> Testing:
> jprt+jtreg
> Thanks,
> Marcus

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