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What benefits does java-monitor has over visualvm?

 
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Hi Kees,

As the subject says, I'm wondering what other benefits java-monitor has over what visualvm?

One thing I can think of is online/web-based monitoring, while visualvm can do remote monitoring but not through web...but on the other hand, visualvm offers benefits like taking thread/heap dump and analysing them later.

Cheers,
Wirianto
 
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Dear Wirianto,

You nailed it. Heap dumps are impractical because of their size and file format nastiness between JVM versions.

Java-monitor lets you look at what happened in a JVM while it is no longer running. You can restart a JVM that has died without worrying about destroying evidence that may lead to resolving the root cause of a crash.

So there is a tradeoff you can make. One has the benefit of being closer to the JVM, while the other has the benefit of being farther away. In fact, I use both tools. ;)

Kees Jan
 
Wirianto Djunaidi
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Ah, how does java-monitor allow viewing dead JVM session? How far in the JVM history does it keep? I assume this is also limited to the amount of storage space to keep the stats.

I'm looking at the website, it seems to imply live session monitoring only.
 
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The basic version charts data over 2 days. You can upgrade that to a week, a month or a year. Attached are examples of the 2-day and the 1-week chart.

Edit: Not sure why the graphs are part black here - there is a time line along the X axis. But you can see how the last part of the 1-week chart corresponds to the 2-day chart.
linegraph.png
[Thumbnail for linegraph.png]
2 day chart
linegraph-1.png
[Thumbnail for linegraph-1.png]
1 week chart
 
Kees Jan Koster
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Thanks Ulf.

Wirianto: if you look at the top graph you can see that that JVM was restarted once or twice. You can see the data across restarts easily.
 
Wirianto Djunaidi
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Thanks for the chart Ulf. My follow up question was how java-monitor allows viewing of not-running JVM session? Does java-monitor has list of previous JVM sessions to view? Because those chart can be just showing current live session which has been alive for past 2-days or 1-week.

-DJ
 
Kees Jan Koster
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Dear Wirianto,

Ah, now I understand the question: Java-monitor does not make new 'sessions' for each restart. We just collect data over time and graph it. If you switch off a JVM for a few hours and then start it back up, that will show in the graphs as a section where no data is available.

Kees Jan

PS. And each Tuesday you get an email with the overview of the availability and number of restarts over the past week.
 
Wirianto Djunaidi
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I'm sorry Kees from being slow. What should I look at to see JVM restart from that top-chart? Looking at sudden dip of Heap usage or dip in Max Heap?

-DJ
 
Wirianto Djunaidi
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Ah, I see your response after I posted my follow up question. Thanks for the answer Kees.

-DJ
 
Kees Jan Koster
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Dear Wirianto,

No problem.

Kees Jan
 
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.
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