hotspot messages about the future?
john.r.rose at oracle.com
Fri Oct 8 18:04:12 PDT 2010
Absolute silence is a fine ideal. As long as we are less than ideal, there's also this:
(Seems a bit odd to have to unlock diagnostics to turn them off, but there's where it stands today.)
On Oct 8, 2010, at 5:21 PM, Kelly O'Hair wrote:
> There is a long list of CRs related to hotspot stdout and stderr (start with 4837953).
> The issue I remember is that if I write a java app that uses stdout and stderr in it's logic,
> and hotspot or the jdk also dumps text to stdout and stderr, it makes the java app's stdout/stderr
> pretty worthless.
> The java app needs to own stdout and stderr, in my opinion, or at a minimum it needs to own stdout.
> I always thought the VM was supposed to be somewhat invisible, the OZ guy behind the curtain, unseen
> unless something REALLY serious happens.
> On Oct 8, 2010, at 4:06 PM, John Pampuch wrote:
>> My recollection is that we choose not to insert messages like this. From my perspective, the output could get really noisy, and spurious output in a release like that *could* affect a shell script, so it could get annoying.
>> Not sure if I'm completely right on the policy, and even if I am, it probably isn't written down anywhere. At very least, I don't recall us doing it before (not that I'm in a habit of checking.)
>> On 10/8/10 3:54 PM, David Holmes wrote:
>>> Kelly O'Hair said the following on 10/09/10 05:21:
>>>> When did the hotspot -XX options start spitting out messages like this?
>>> I can't tell exactly, but this was there when HS moved to Mercurial.
>>> I think it is done whenever an option has become obsolete, or is not applicable/appropriate for the given usage.
>>>> svc6<1263> java -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled -version
>>>> Please use CMSClassUnloadingEnabled in place of CMSPermGenSweepingEnabled in the future
>>>> java version "1.6.0_10"
>>>> Java(TM) SE Runtime Environment (build 1.6.0_10-b33)
>>>> Java HotSpot(TM) Server VM (build 11.0-b15, mixed mode)
>>>> I always thought silence was golden?
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