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Benchmarking

Run benchmarking tests against the demo webhook

Execute the following steps to run a benchmark on Lightning:

  1. Make sure you have k6 installed locally. If you're using asdf you can run asdf install in the project root.

  2. Start up a local Lightning instance with an attached iex session. Note that to simulate a production environment, set RTM=false. In prod, you'll have your ws-worker running on a separate machine:

    RMT=false iex -S mix phx.server

  3. In the attached iex session, run the following, to have Lightning log internal telemetry data:

      filepath = Path.join("benchmarking", "load_test_data.csv")
  output_file = File.open!(filepath, [:append])

  c "benchmarking/load_test_production_spans.exs"

  LoadTestingPrep.init(output_file)

  4. Run the demo setup script: mix run --no-start priv/repo/demo.exs The webhookURL is already set to default to the webhook created in the demo data

    If you would like to point at a different instance or webhook url you can provide it via WEBHOOK_URL.

  5. In another terminal (do not stop the Lightning server) run the benchmarking/script.js file using the following command

    k6 run benchmarking/script.js

    If the script exits successfully, this means the app met the defined performance thresholds.

    By default, the test payload is just 2 kb. Should you wish to test it with larger payloads, you can pass in the PAYLOAD_SIZE_KB ENV variable. This variable allows you to specify the payload size in KB (for now, integer values only), (e.g. 2 KB):

    k6 run -e PAYLOAD_SIZE_KB=2 benchmarking/script.js

    To collect the benchmarking data in a CSV file, run the previous command with the --out filename option.

    k6 run --out csv=test_results.csv benchmarking/script.js

  6. In the iex session, close the output file:

    LoadTestingPrep.fin(output_file)

See results output for other available output formats.

Sample benchmarks

System specs on a 2020 MacBook Pro

Model Name: MacBook Pro
Model Identifier: MacBookPro17,1
Model Number: Z11B000E3LL/A
Chip: Apple M1
Total Number of Cores: 8 (4 performance and 4 efficiency)
Memory: 16 GB

Results with 50kb payloads

k6 run -e PAYLOAD_SIZE=10 benchmarking/script.js                         Node 18.17.1 k6 0.43.1 07:40:29

          /\      |‾‾| /‾‾/   /‾‾/
     /\  /  \     |  |/  /   /  /
    /  \/    \    |     (   /   ‾‾\
   /          \   |  |\  \ |  (‾)  |
  / __________ \  |__| \__\ \_____/ .io

  execution: local
     script: benchmarking/script.js
     output: -

  scenarios: (100.00%) 1 scenario, 50 max VUs, 2m50s max duration (incl. graceful stop):
           * webhookRequests: Up to 50.00 iterations/s for 2m20s over 3 stages (maxVUs: 50, gracefulStop: 30s)


     ✓ status was 200

     █ setup

     checks.........................: 100.00% ✓ 5765     ✗ 0
     data_received..................: 1.6 MB  12 kB/s
     data_sent......................: 59 MB   421 kB/s
     http_req_blocked...............: avg=16.01µs min=2µs     med=9µs     max=6.84ms   p(90)=12µs    p(95)=13µs
     http_req_connecting............: avg=4.35µs  min=0s      med=0s      max=2.22ms   p(90)=0s      p(95)=0s
   ✓ http_req_duration..............: avg=53.62ms min=26.86ms med=49.03ms max=501.62ms p(90)=66.62ms p(95)=84.33ms
       { expected_response:true }...: avg=53.62ms min=26.86ms med=49.03ms max=501.62ms p(90)=66.62ms p(95)=84.33ms
   ✓ http_req_failed................: 0.00%   ✓ 0        ✗ 5765
     http_req_receiving.............: avg=88.57µs min=13µs    med=90µs    max=2.99ms   p(90)=108µs   p(95)=124.8µs
     http_req_sending...............: avg=97.47µs min=29µs    med=83µs    max=6.86ms   p(90)=139µs   p(95)=162µs
     http_req_tls_handshaking.......: avg=0s      min=0s      med=0s      max=0s       p(90)=0s      p(95)=0s
     http_req_waiting...............: avg=53.44ms min=26.68ms med=48.84ms max=501.43ms p(90)=66.43ms p(95)=84.05ms
     http_reqs......................: 5765    41.15402/s
     iteration_duration.............: avg=54.34ms min=20.75µs med=49.75ms max=502.26ms p(90)=67.39ms p(95)=84.91ms
     iterations.....................: 5765    41.15402/s
     vus............................: 50      min=50     max=50
     vus_max........................: 50      min=50     max=50


running (2m20.1s), 00/50 VUs, 5765 complete and 0 interrupted iterations
webhookRequests ✓ [======================================] 00/50 VUs  2m20s  01.12 iters/s

Run load tests for a hypothetical cold chain system

benchmarking/sample_cold_chain_monitoring_script.js contains a k6 script that can be used to simulate data from a hypothetical cold chain system. It requires a custom job to be created (an example of which can be found at the top of the script file).

The test can be excuted as follows (WEBHOOK_URL is not optional):

   WEBHOOK_URL=... k6 run benchmarking/sample_cold_chain_monitoring_script.js