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Brendan Gregg edited this page May 19, 2013 · 2 revisions

Heat Map SVG

See the interactive SVG version.

This visualizes event latency:

  • x-axis: the passage of time, at a one second granularity
  • y-axis: event latency
  • z-axis (color saturation): how many events occurred at that time/latency range

This is similar to a scatter plot, but doesn't suffer from a density limit.

This example heat map shows disk I/O for two minutes, with latencies between 0 and 2000 us (2 ms). The distribution is bi-modal, and varies over time.

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