Quick & Dirty Prometheus on OS-X

Install prometheus

  • Download the compiled prometheus binaries from prometheus.io
  • Unzip the binary and cd into the directory.
  • Run the prometheus binary, from the command line, it will listen on port 9090
$ cd /Users/gary.little/Downloads/prometheus-2.16.0-rc.0.darwin-amd64
$ ./prometheus
  • From a local browser, point to localhost:9090
prometheus web-ui

Add a collector/scraper to monitor the OS

Prometheus itself does not do much apart from monitor itself, to do anything useful we have to add a scraper/exporter module. The easiest thing to do is add the scraper to monitor OS-X itself. As in Linux the OS exporter is simply called “node exporter”.

Start by downloading the pre-compiled darwin node exporter from prometheus.io

  • Unzip the tar.gz
  • cd into the directory
  • run the node exporter
$ cd /Users/gary.little/Downloads/node_exporter-0.18.1.darwin-amd64
$ ./node_exporter
 INFO[0000] Starting node_exporter (version=0.18.1, branch=HEAD, revision=3db77732e925c08f675d7404a8c46466b2ece83e)  source="node_exporter.go:156"
 INFO[0000] Build context (go=go1.11.10, user=root@4a30727bb68c, date=20190604-16:47:36)  source="node_exporter.go:157"
 INFO[0000] Enabled collectors:                           source="node_exporter.go:97"
 INFO[0000]  - boottime                                   source="node_exporter.go:104"
 INFO[0000]  - cpu                                        source="node_exporter.go:104"
 INFO[0000]  - diskstats                                  source="node_exporter.go:104"
 INFO[0000]  - filesystem                                 source="node_exporter.go:104"
 INFO[0000]  - loadavg                                    source="node_exporter.go:104"
 INFO[0000]  - meminfo                                    source="node_exporter.go:104"
 INFO[0000]  - netdev                                     source="node_exporter.go:104"
 INFO[0000]  - textfile                                   source="node_exporter.go:104"
 INFO[0000]  - time                                       source="node_exporter.go:104"
 INFO[0000] Listening on :9100                            source="node_exporter.go:170""
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Paper: A Nine year study of filesystem and storage benchmarking

A 2007 paper, that still has lots to say on the subject of benchmarking storage and filesystems. Primarily aimed at researchers and developers, but is relevant to anyone about to embark on a benchmarking effort.

  • Use a mix of macro and micro benchmarks
  • Understand what you are testing, cached results are fine – as long as that is what you had intended.

The authors are clear on why benchmarks remain important:

Ideally, users could test performance in their own settings using real work- loads. This transfers the responsibility of benchmarking from author to user. However, this is usually impractical because testing multiple systems is time consuming, especially in that exposing the system to real workloads implies learning how to configure the system properly, possibly migrating data and other settings to the new systems, as well as dealing with their respective bugs.”

We cannot expect end-users  to be experts in benchmarking. It is out duty as experts  to provide the tools (benchmarks) that enable users to make purchasing decisions without requiring years of benchmarking expertise.

Simple statistics for performance analysts.

As performance analysts we often have to summarize large amounts of data in order to make engineering decisions or understand existing behavior.  This paper will help you do exactly that!  Many analysts know that using statistics can help, but statistical analysis is a huge field in itself and has its own complexity.  The article below distills the essential techniques that can help you with typical performance analysis tasks.

PDF Download.

[pdf-embedder url=”https://www.n0derunner.com/wp-content/uploads/2018/01/Statistics-for-the-performance-analyst.pdf” title=”Statistics for the performance analyst”]