How does DT get the heap, thread, GC data, etc on AIX? I see GC times of 10 to 20 seconds slowing the system down. I want to figure out what to tune.
Thanks
Answer by Andreas G. · Jun 05, 2013 at 11:27 AM
Our Agent gets these timings either directly from the JVM or through JMX measures. You can look at the details of the Measure Definition to see which JMX measures we are actually collecting - or - you can also create new Measures in case the ones we deliver out-of-the-box are not sufficient
Tuning is a different topic - here I suggest you read our online java performance book. it has a chapter on Memory Management
Answer by Sandeep M. · Jun 18, 2013 at 08:33 PM
I enable gc logging on our server and then compared it to the numbers in the host dashboard GC times. The GC Times shown by dynatrace was something like this..
It shows absolute GC times of 10 to 15 seconds.
However in the GC log between 2:00 and 2:15pm, the totalms has never gone over 1 second. How is it calculating those numbers?
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<con event="final card cleaning">
<stats cardscleaned="3890" traced="2929988" durationms="12.309" />
</con>
<gc type="global" id="726" totalid="726" intervalms="60027.570">
<refs_cleared soft="5645" threshold="32" weak="3643" phantom="0" />
<finalization objectsqueued="2180" />
<timesms mark="32.026" sweep="1.188" compact="0.000" total="34.186" />
<tenured freebytes="553812992" totalbytes="1073741824" percent="51" >
<soa freebytes="553812992" totalbytes="1073741824" percent="51" />
<loa freebytes="0" totalbytes="0" percent="0" />
</tenured>
</gc>
<tenured freebytes="553812992" totalbytes="1073741824" percent="51" >
<soa freebytes="553812992" totalbytes="1073741824" percent="51" />
<loa freebytes="0" totalbytes="0" percent="0" />
</tenured>
<time totalms="34.732" />
</sys>
Hi Sandeep,
The chart you posted above shows one bar per 15 minutes, it is the sum of all GC activity in that timeframe not the average. So you'd have to add up the GC times between 2 and 2:15 to get to the roughly 15s we show in the chart.
Best, Roman
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