JProbe vs GC memory graphs

[Fahd Shariff]

Hello,

When I look at the "Runtime Heap Summary" in JProbe (which shows memory
usage) and compare it with graphs plotted in excel using GC output they
look completely different. Using the GC output I plotted the before and
after memory graphs and neither remotely resembles JProbe's.

Any ideas?

 

[John Currier]

Hello,

When I look at the "Runtime Heap Summary" in JProbe (which shows memory
usage) and compare it with graphs plotted in excel using GC output they
look completely different. Using the GC output I plotted the before and
after memory graphs and neither remotely resembles JProbe's.

Any ideas?

JProbe's memory utilization graphs are sampled at a significantly
higher frequency than the GC's output. The graphed GC output is
usually only after the GC has occurred whereas JProbe's output is
throughout the life of the JVM. There should, however, be some
correlation between the post-GC results of both graphs.

John
http://schemaspy.sourceforge.net