RFR: 8288599: com/sun/management/OperatingSystemMXBean/TestTotalSwap.java: Expected total swap size ... but getTotalSwapSpaceSize returned ...

[Leonid Mesnik]

On Fri, 17 Jun 2022 11:50:08 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

>> The failure is very intermittent and I wasn't able to reproduce it.
>> 
>> I suspect that the swap might be changed during test execution so I add the corresponding check. 
>> 
>> If test still fails after fix we should at least exclude this potential problem.
>
> test/jdk/com/sun/management/OperatingSystemMXBean/TestTotalSwap.java line 76:
> 
>> 74: 
>> 75:         // if swap data from OS chnaged re-read OS and MBean data
>> 76:         while (expected_swap_size != getSwapSizeFromOs()) {
> 
> Can we put a limit on this?
> OS swap usage could be continually changing, this seems worth a try but we want to escape and give up after some number of tries?
> If there is some variation that's making us fail, we could also mask off some number of low bits, or a byte or more even, to do an approximate comparison?  Might want to try that if retrying does not succeed.

I doubt that swap might change so often. The failure is reproduced once in several months.
Let's check the logs if the test failed.

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PR: https://git.openjdk.org/jdk/pull/9174