Memory Leak Detector data collection timing

Question

Hello,
I am Yoshizo Aori working at HP Japan.
I would like to know timing of data collection for
updating object type byte size increase rate.
Data collection at garbage collection or any other timing?
Is it possible to change the timing of the data collection?

Answer 1

Yoshizo,
The actual "Growth(bytes/sec)" column is updated along with the other columns at every normal GC and currently, independent of any GC, also every ten seconds. This interval is not yet configurable. (While the trend analysis is running, it is possible to manually press "Refresh" to get shorter time between updates.)
However, the Growth column is primarily calculated using historic data collected during normal GCs while the trend analysis is active. Only if the historic data shows a difference in heap usage, the current value shown in the "Size (KB)" column is taken into account. The effect is that the "Refresh" button only updates Growth column rows that have had non-zero values.
This also means that if an application leaks slowly and doesn't generate enough garbage to trigger a GC in the near future, you may not notice it by looking at the Growth column. If so, it is possible to trigger a GC, and thus a possible collection of historic data, by selecting "Garbage Collect" from the Action menu.
Remember though, since the Growth column represents the growth rate over the entire time that the trend analysis has been running, you may want to avoid very long running analyses. In fact, after a while, historic data is not collected every GC but more and more seldom.