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GCMV - What are the time units for Total values on the summary page?

  • 1.  GCMV - What are the time units for Total values on the summary page?

    IBM Champion
    Posted Tue November 26, 2019 03:29 AM

    I'm currently using WebStart version of GCMV coming with ISA 5.0.2.8. When looking at the summary page of the file I'm wondering what the time unit for values like 'Total amount ... (MB)' is?

    For example: The following values on the summary page (sorry uploading images does not work for me at the moment):
    Global collections - Total amount tenured (MB) 254453
    Nursery collections - Total amount flipped (MB) 6720
    Nursery collections - Total amount tenured (MB) 4100

    are giving the number of MBs per which time span? Is this per minute? Over the full cropped interval? 

    The Rate of garbage collection (MB/minute) which I can see on my Linux Eclipse plugin-version of GCMV is not shown here either in this version of GCMV.

    The docs at https://www.ibm.com/support/knowledgecenter/en/SS3KLZ/com.ibm.java.diagnostics.visualizer.doc/vgc_menuitems.html don't give me much more information either (sorry in case I missed something there).

    Thanks a lot in advance for your advise.



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    Hermann Huebler

    #IBMChampion
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  • 2.  RE: GCMV - What are the time units for Total values on the summary page?

    Posted Wed November 27, 2019 12:01 PM
    Edited by Kevin Grigorenko Wed November 27, 2019 12:01 PM
    Hi Hermann, everything on the Report is for the cropped interval (not the zoomed interval). Crop using this method: https://publib.boulder.ibm.com/httpserv/cookbook/Major_Tools-Garbage_Collection_and_Memory_Visualizer_GCMV.html#Major_Tools-Garbage_Collection_and_Memory_Visualizer_GCMV-Cropping_Data_Analysis

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    Kevin Grigorenko
    WebSphere SWAT
    IBM
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    Original Message


  • 3.  RE: GCMV - What are the time units for Total values on the summary page?

    Posted Mon October 16, 2023 01:05 PM

    On further review, we have removed the "Global collections - Total amount tenured" statistic as it doesn't make much sense. New builds of GCMV have been published. The "Rate of garbage collection" statistic on the report tab or the "GC rate (per ms)" line plots are the easiest way to review GC throughput.



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    Kevin Grigorenko
    Application Runtimes SWAT
    IBM
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    Original Message