Safepoint Bean?

[Tony Printezis]

Hi Mandy,

Thanks for the response! I hope you’re well!

We’d like to be able to get safepoint stats from within the JVM so we can
post them to our observability system. Would creating a Bean (a la
GarbageCollectorMXBean) that exposes this info make sense? I’d be happy to
work on it if there’s interest. Would you recommend an alternative method?

Tony


—————
Tony Printezis | @TonyPrintezis | tprintezis at twitter.com


On October 14, 2019 at 12:49:57 PM, Mandy Chung (mandy.chung at oracle.com)
wrote:

jdk.internal.jvmstat is JDK internal unsupported API.  jstat and jcmd
monitors the JVM statistics that you can use but I think they don't show
the safepoint counters by default.

Mandy

On 10/14/19 8:25 AM, Tony Printezis wrote:

Is jvmstat a public / supported API? The jdk.internal.jvmstat module
doesn’t seem to be exporting anything publicly (and it also has “internal”
in its name).

Tony


—————
Tony Printezis | @TonyPrintezis | tprintezis at twitter.com


On October 11, 2019 at 11:10:18 PM, Yasumasa Suenaga (
suenaga at oss.nttdata.com) wrote:

Hi,

AFAIK the API for them does not provided, but we can use reader class for
hsperfdata
in jdk.internal.jvmstat module.
Examples are available on my GitHub:

https://github.com/YaSuenag/perfreader

You can get safepoint statistics via sun.rt.safepoint* in hsperfdata.


Yasumasa


On 2019/10/12 10:30, Hohensee, Paul wrote:
> I don’t know of any. Also, it appears that there are no uses of any of
the HotspotRuntimeMBean methods in the JDK, so it could actually be
removed! If you want to add its methods to a public interface, I’d create
com.sun.management.RuntimeMXBean by analogy to c.s.m.ThreadMXBean and use
the supported/enabled approach of *ThreadAllocatedBytes*. Needs a CSR, of
course.
>
> Paul
>
> *From: *serviceability-dev <serviceability-dev-bounces at openjdk.java.net>
on behalf of Tony Printezis <tprintezis at twitter.com>
> *Date: *Friday, October 11, 2019 at 1:45 PM
> *To: *"serviceability-dev at openjdk.java.net" <
serviceability-dev at openjdk.java.net>
> *Subject: *Safepoint Bean?
>
> Hi there,
>
> Is there a standard MBean (similar to GarbageCollectorMXBean), or other
mechanism, that can be used to get safepoint statistics from Java (count,
time, etc.)? I know it’s possible to get that info from
sun.management.HotspotRuntime.java, but I assume this is not a publicly
accessible API any more? Is there a standard alternative?
>
> Thanks,
>
> Tony
>
> —————
>
> Tony Printezis | @TonyPrintezis | tprintezis at twitter.com <mailto:
tprintezis at twitter.com>
>
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