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  1. Jenkins
  2. JENKINS-51532

Plot plugin extreme memory leak with matrix jobs


    • Type: Bug
    • Status: Open (View Workflow)
    • Priority: Minor
    • Resolution: Unresolved
    • Component/s: plot-plugin
    • Environment:
      Jenkins 2.107.2 + Plot plugin 2.04; master running on openjdk-1.8.0/linux.
    • Similar Issues:


      After a day or two, our Jenkins master becomes very unresponsive, taking 100% CPU of all available cores. The response time drops to tens of seconds, or sometimes even minutes to load a single page.

      Investigation with VisualVM shows much garbage collection taking place, with the heap nearly maxed out (at 1GB use of 1.25GB max). Looking at a heap snapshot, I discovered that the majority of memory is taken up by String[] objects, containing 5-tuples of Strings (referencing char[] arrays in turn). There are over a million of these small string arrays, each having contents similar to ["35300", "Size", "709", "1526866800302", ""].

      Tracing the references of the objects reveals that they are held by the rawPlotData of MatrixPlotPublisher objects. rawPlotData is itself an array; a single sample object in our snapshot contains 106710 string arrays like the one above.

      The most likely plot that's causing this is a CSVSeries plot tracking the size of ~7000 generated files (per matrix build). That's still several orders of magnitude less than the number of objects being built internally.



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            • Assignee:
              vgaidarji Veaceslav Gaidarji
              cameron314 Cameron
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