RFR: 8276252: java/nio/channels/Channels/TransferTo.java failed with OOM java heap space error

[Brian Burkhalter]

On Wed, 3 Nov 2021 07:26:10 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> test/jdk/java/nio/channels/Channels/TransferTo.java line 55:
>> 
>>> 53:  * @library /test/lib
>>> 54:  * @build jdk.test.lib.RandomFactory
>>> 55:  * @run testng/othervm TransferTo
>> 
>> Hello Brian, should this also perhaps set the `-Xmx` value to a higher value or is the current VM defaults for max heap size on all VMs expected to be big enough for this test?
>
>> Hello Brian, should this also perhaps set the `-Xmx` value to a higher value or is the current VM defaults for max heap size on all VMs expected to be big enough for this test?
> 
> This may be helpful as this test needs to do some big transfer. For the specific OOME sighting then I suspect it may be more to do with how the tests are run. From what I can tell, it's running a very large group of tests and it's likely that the agent VM has been running for a long time. It could be that other tests that ran previously in this VM have left things behind.

The version of the test proposed here passes with the command line option `-Xmx512M`, so if the default maximum heap size is really half the physical memory then I don't think it is necessary to set `-Xmx`.

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PR: https://git.openjdk.java.net/jdk/pull/6219