softreference, 0 refs report high cost time

[stefan.johansson at oracle.com]

Hi,

None of your attachments made it through to the lists. Try subscribing 
to the list if you haven't already done that, it should help.

Judging from the log snippets in this initial mail you seem to be 
running a fairly old JDK. Have you trying with JDK 14 to see if the 
problems still exists in a recent release? There have been a lot of 
improvements to reference processing the last couple of years.

Thanks,
Stefan

On 2020-08-19 12:04, 王顺云 wrote:
> Hi Forks,
> 
> I have an application that reported high (more than 1 second) times to 
> process *zero* SoftReferences, for example:
> 
> 2020-08-11T18:58:19.222+0800: 611331.604: [SoftReference, 0 refs, 
> 1.4741673 secs]2020-08-11T18:58:20.696+0800: 611333.079: [WeakReference, 
> 0 refs, 0.0004746 secs]2020-08-11T18:58:20.696+0800: 611333.079: 
> [FinalReference, 4559 refs, 0.0019431 secs]2020-08-11T18:58:20.698+0800: 
> 611333.081: [PhantomReference, 2 refs, 0 refs, 0.0016303 
> secs]2020-08-11T18:58:20.700+0800: 611333.083: [JNI Weak Reference, 
> 0.0000284 secs], 1.4867549 secs]
> 
> 2020-08-14T02:58:22.222+0800: 812934.605: [SoftReference, 0 refs, 
> 1.0247147 secs]2020-08-14T02:58:23.247+0800: 812935.629: [WeakReference, 
> 1 refs, 0.0007859 secs]2020-08-14T02:58:23.247+0800: 812935.630: 
> [FinalReference, 4382 refs, 0.0024934 secs]2020-08-14T02:58:23.250+0800: 
> 812935.633: [PhantomReference, 2 refs, 0 refs, 0.0008613 
> secs]2020-08-14T02:58:23.251+0800: 812935.634: [JNI Weak Reference, 
> 0.0000239 secs], 1.0380333 secs]
> 
> We have been hit by this anomaly a few times now, and  detailed 
> information can be find in the attached logs (that also show the command 
> line flags).
> 
> OS information: Linux 3.10.0-862.el7.x86_64 x86_64
> NAME="CentOS Linux"
> VERSION="7 (Core)"
> 
> Docker version:
> 18.09.9
> 
> Thanks for the help.
> 
> Tony
> 
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