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PerfTop dashboards

You can view metrics derived from Performance Analyzer in a PerfTop dashboard. A PerfTop dashboard is a command line interface (CLI) for displaying the metrics. A PerfTop dashboard consists of three main elements: tables, line graphs, and bar graphs. Using JSON, you define a grid of rows and columns and then place elements within that grid, with each element spanning as many rows and columns as you specify.

The best way to get started with building custom dashboards is to duplicate and modify one of the existing JSON files in the dashboards directory.

An example dashboard is shown in the following image.

Table of contents

1. Summary of elements
2. Position elements
3. Add queries
4. Add options
   1. All elements
   2. Tables
   3. Bars
   4. Lines

Summary of elements

• Tables show metrics per dimension. For example, if your metric is CPU_Utilization and your dimension ShardID, a PerfTop table shows a row for each shard on each node.
• Bar graphs are aggregated for the cluster, unless you add nodeName to the dashboard. See the options for all elements.
• Line graphs are aggregated for each node. Each line represents a node.

Position elements

PerfTop positions elements within a grid. For example, consider this 12 * 12 grid.

The upper-left of the grid represents row 0, column 0, so the starting positions for the three boxes are:

• Orange: row 0, column 0
• Purple: row 2, column 2
• Green: row 1, column 6

These boxes span a number of rows and columns. In this case:

• Orange: 2 rows, 4 columns
• Purple: 1 row, 4 columns
• Green: 3 rows, 2 columns

In JSON form, we have the following:

{
  "gridOptions": {
    "rows": 12,
    "cols": 12
  },
  "graphs": {
    "tables": [{
        "options": {
          "gridPosition": {
            "row": 0,
            "col": 0,
            "rowSpan": 2,
            "colSpan": 4
          }
        }
      },
      {
        "options": {
          "gridPosition": {
            "row": 2,
            "col": 2,
            "rowSpan": 1,
            "colSpan": 4
          }
        }
      },
      {
        "options": {
          "gridPosition": {
            "row": 1,
            "col": 6,
            "rowSpan": 3,
            "colSpan": 2
          }
        }
      }
    ]
  }
}

At this point, however, all the JSON does is define the size and position of three tables. To fill elements with data, you specify a query.

Add queries

Queries use the same elements as the REST API, just in JSON form:

{
  "queryParams": {
    "metrics": "estimated,limitConfigured",
    "aggregates": "avg,avg",
    "dimensions": "type",
    "sortBy": "estimated"
  }
}

For details on available metrics, see Metrics reference.

Add options

Options include labels, colors, and a refresh interval. Different elements types have different options.

Dashboards support the 16 ANSI colors: black, red, green, yellow, blue, magenta, cyan, and white. For the “bright” variants of these colors, use the numbers 8–15. If your terminal supports 256 colors, you can also use hex codes (e.g. #6D40ED).

All elements

Tables

Bars

Lines