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uptime [message #986898]

Thu, 22 November 2012 10:16

Bernt Formella

Messages: 3
Registered: November 2012

Junior Member

Hi

Does an hprof dump include how long has the jvm been running? Does MAT report it (can't seem to find it)?

Cheers

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Re: uptime [message #986925 is a reply to message #986898]

Thu, 22 November 2012 11:38

Krum Tsvetkov

Messages: 163
Registered: July 2009

Senior Member

Hi,

don't think there is a special field for this in the heap dump.
If there is any object keeping the startup date/time one could see it. I had a look at the System properties, but I didn't find there such a property.
One thing that could work:
- when starting the VM you pass an additional system property, keeping the start date/time, i.e. something like -DstartTime=<time>. You can pass date and time from the OS commands
- once you trigger a heap dump and open it in MAT, you open from the query menu "Java Basics" -> "System properties" and see the start date/time
- in the heap dump details view you can see the time when the heap dump is taken

It's not diretly the value "uptime" but you can calcualte it.
Let me know if this helps.

Krum

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Re: uptime [message #990372 is a reply to message #986925]

Wed, 12 December 2012 08:26

Bernt Formella

Messages: 3
Registered: November 2012

Junior Member

Yes it helped.
Thanks!

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