Time Stamps

[Ted Neward]

Quick clarification: what does UnlockDiagnosticVMOptions do? Does that turn
on non-product -XX options in the product builds or something?

Ted Neward
Java, .NET, XML Services
Consulting, Teaching, Speaking, Writing
http://www.tedneward.com

> -----Original Message-----
> From: hotspot-dev-bounces at openjdk.java.net [mailto:hotspot-dev-
> bounces at openjdk.java.net] On Behalf Of Tom Rodriguez
> Sent: Tuesday, June 12, 2007 2:55 PM
> To: Peter B. Kessler
> Cc: hotspot-dev at openjdk.java.net; Cunningham, Ryan
> Subject: Re: Time Stamps
> 
> The hotspot.log also contains a reference timestamp telling when the VM
> started.
> 
> <hotspot_log version='160 1' process='21174' time_ms='1168494632477'>
> 
> time_ms is the same value System.currentTimeMillis() would have returned
> at the
> point we started the JVM.  All the timestamps should be relative to that
> time so
> you should be able to convert from that.  Normally the hotspot.log isn't
> written
> to disk so you'd need to add -XX:+UnlockDiagnosticVMOptions -
> XX:+LogVMOutput if
> you want to get at it.
> 
> tom
> 
> Peter B. Kessler wrote:
> > Cunningham, Ryan wrote:
> >
> >> In the output of the java process's activity there are timestamps,
> >> "6.074: [GC {Heap before gc invocations=0:", and the 6.074 is time
> >> after start of process and I want to change that to human time. I am
> >> not really sure where to go from here. I have searched the files and
> >> have a vague idea of where it comes from.
> >>
> >> Ryan P Cunningham
> >> CBOE
> >> cunningh at cboe.com
> >
> > If you can wait for build 14, you'll find that I've added
> >
> >     -XX:+PrintGCDateStamps
> >
> > as a fix for
> >
> >     6517301: There should be a -XX:+PrintGCDateStamps
> >     http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6517301
> >
> > which will put an ISO-8601 date and time on the GC output.  E.g.,
> >
> >     2007-06-09T12:57:35.093-0700: [GC [PSYoungGen: 4064K->1552K(4928K)]
> > 38770K->36258K(63232K), 0.0590532 secs] [Times: user=0.08 sys=0.00,
> > real=0.06 secs]
> >
> > Is that what you wanted to do?  If so, I apologize for preempting
> > your doing it, but we already had a bunch of customers that wanted
> > that feature.  (Some from large financial traders in Chicago. :-)
> > You wouldn't have liked it anyway, since the obvious solution of
> > using strftime(3C) doesn't work on Windows.
> >
> >             ... peter
> 
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