Log Visualization Tools

[Matt Fowles]

Ramki~

What rules govern the upgrade of logging formats?  Can the format only
be changed on major releases or can we just add a flag 'new format' to
minor releases?

Matt

On Fri, Aug 5, 2011 at 4:33 PM, Ramki Ramakrishna
<y.s.ramakrishna at oracle.com> wrote:
> Sorry for the noise: my response was sent to the wrong list in error;
> corrected herewith.
>
> -- ramki
>
> On 8/5/2011 1:28 PM, Ramki Ramakrishna wrote:
>> Same here -- i sometimes use an internal homegrown awk script to
>> extract the
>> metrics, so they can be massaged into a data file amenable to plotting
>> with gnuplot.
>> That script does not take well to the extra output either, so we
>> usually strip out the
>> extra output and deal with only the more fundamental metrics only. The
>> extra output
>> from the more fancy flags has thus far been consumed only by humans or
>> extracted on an ad-hoc basis into
>> spreadsheets and such. This is clearly not a nice state of affairs. I
>> believe there is
>> work (or plans?) underway for some kind of logging framework into
>> which the JVM will feed
>> its metrics, and hopefully the tooling that consumes those logs will
>> be able to
>> deal with all these issues in a more uniform fashion once and for
>> all.... Unfortunately,
>> I have no real details of that work, though...
>>
>> Then there is gchisto which is GC-specific (but which also cannot
>> consume the output
>> from the more fancy flags), but that has been placed on the backseat
>> as other issues
>> have intervened.
>> In general, until GC logging formats are standardized, tools that
>> consume textual
>> output from the JVM/GC will tend to break unless changes to these text
>> formats are
>> carefully controlled. There has been some talk on and off about trying to
>> standardize those formats, but I am not sure about the status of that.
>> May be the
>> logging framework mentioned earlier will provide a superstructure from
>> which such
>> textual standardization will result naturally.
>>
>> -- ramki
>>
>> On 8/5/2011 12:40 PM, Eric Caspole wrote:
>>> Sometimes I use HPjmeter for plain Xloggc, but I don't think it can
>>> do the fancy extra flags either.
>>>
>>> On Aug 5, 2011, at 1:51 PM, Matt Fowles wrote:
>>>
>>>> All~
>>>>
>>>> What tools do people know of or have for parsing gc logs and
>>>> visualizing the results?
>>>>
>>>> The only thing I can find, GCViewer, (from
>>>> http://www.tagtraum.com/gcviewer.html) seems like it has not been
>>>> updated for a while and does not parse a lot of more complicated logs
>>>> (-XX:+PrintTenuringDistribution or -XX:PrintCMSStatistics=1).
>>>>
>>>> Are there more tools out there?  Are there in house tools that people
>>>> are willing to share?
>>>>
>>>> Matt
>>>> _______________________________________________
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>>>>
>>>
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