8224480: (fc) java/nio/channels/FileChannel/MapTest.java fails intermittently

[Alan Bateman]

On 28/06/2019 22:46, Brian Burkhalter wrote:
> https://bugs.openjdk.java.net/browse/JDK-8224480
>
> The failures reported in this issue were all in the recently added 
> MapTest.testForce() method. This method currently performs 12,800 
> invocations of MappedByteBuffer.force(int,int). On Unix, force() calls 
> msync(2) to flush the in-memory data to the file system. The machines 
> on which the failures occurred were determined to be two 2012 vintage 
> Mac Pros and a Mac Mini of similar vintage, all running HDDs, 5400 RPM 
> on the Mini, 7200 RPM on the Pros. The hypothesis is that these 
> configurations could be too slow for this sub-test so this patch 
> proposes to halve the number of iterations in testForce() to account 
> for this. An alternative would be to change testForce() to be a 
> separate test.
This looks okay but I'm curious what the run-times are like on these 
systems (I'm just wondering if it might also be useful to add a /timeout 
option to the @run line so that they have more time to complete, even 
with the reduced number of iterations).

-Alan
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