feat: output wrk results to a csv

[joyeecheung]

Using the scripting feature of wrk, write the output to stats.csv for further processing (e.g. plotting).

Example output:

name,latency_min,latency_max,latency_mean,latency_stdev,duration,requests,bytes,req_per_sec,byte_per_sec
"koa hello",165.00,63084.00,2743.13,1576.05,10102308,180171,28467018,17834.64,2817872.71
"toa hello",168.00,64731.00,2911.40,2722.47,10103856,193770,34297290,19177.83,3394475.34
"egg hello",350.00,79461.00,4315.68,2272.80,10009102,113815,40062885,11371.15,4002645.29
"egg hello (Async Await)",259.00,31136.00,4018.37,1466.82,10100621,120584,42445568,11938.28,4202273.11
"koa view",168.00,105806.00,4354.07,3645.24,10101945,118982,311851822,11778.13,30870473.16
"toa view",268.00,91469.00,4875.81,4120.25,10014497,112771,297715440,11260.78,29728446.67
"egg nunjucks view",505.00,140960.00,7712.66,5459.70,10023077,66291,187206013,6613.84,18677499.24
"egg ejs view",342.00,64918.00,6455.52,3241.16,10102688,76587,217890072,7580.85,21567534.50
"egg nunjucks view (Async Await)",795.00,49536.00,7074.10,3623.01,10014379,70171,198584087,7007.02,19829895.29
"egg ejs view (Async Await)",408.00,35333.00,6497.54,2952.90,10023491,75555,215407364,7537.79,21490253.65
"egg passport",581.00,73491.00,4329.88,2349.59,10009915,113975,39891254,11386.21,3985174.10
"egg passport (Async Await)",268.00,55971.00,4076.90,1674.84,10101572,119299,42231846,11809.94,4180720.19

Using csv as the output format because it doesn't require additional encoding in a lua script. This can be easily converted to a JSON format too, e.g.

JSON example

[
  {
    "name": "koa hello",
    "latency_min": 165,
    "latency_max": 63084,
    "latency_mean": 2743.13,
    "latency_stdev": 1576.05,
    "duration": 10102308,
    "requests": 180171,
    "bytes": 28467018,
    "req_per_sec": 17834.64,
    "byte_per_sec": 2817872.71
  },
  {
    "name": "toa hello",
    "latency_min": 168,
    "latency_max": 64731,
    "latency_mean": 2911.4,
    "latency_stdev": 2722.47,
    "duration": 10103856,
    "requests": 193770,
    "bytes": 34297290,
    "req_per_sec": 19177.83,
    "byte_per_sec": 3394475.34
  },
  {
    "name": "egg hello",
    "latency_min": 350,
    "latency_max": 79461,
    "latency_mean": 4315.68,
    "latency_stdev": 2272.8,
    "duration": 10009102,
    "requests": 113815,
    "bytes": 40062885,
    "req_per_sec": 11371.15,
    "byte_per_sec": 4002645.29
  },
  {
    "name": "egg hello (Async Await)",
    "latency_min": 259,
    "latency_max": 31136,
    "latency_mean": 4018.37,
    "latency_stdev": 1466.82,
    "duration": 10100621,
    "requests": 120584,
    "bytes": 42445568,
    "req_per_sec": 11938.28,
    "byte_per_sec": 4202273.11
  },
  {
    "name": "koa view",
    "latency_min": 168,
    "latency_max": 105806,
    "latency_mean": 4354.07,
    "latency_stdev": 3645.24,
    "duration": 10101945,
    "requests": 118982,
    "bytes": 311851822,
    "req_per_sec": 11778.13,
    "byte_per_sec": 30870473.16
  },
  {
    "name": "toa view",
    "latency_min": 268,
    "latency_max": 91469,
    "latency_mean": 4875.81,
    "latency_stdev": 4120.25,
    "duration": 10014497,
    "requests": 112771,
    "bytes": 297715440,
    "req_per_sec": 11260.78,
    "byte_per_sec": 29728446.67
  },
  {
    "name": "egg nunjucks view",
    "latency_min": 505,
    "latency_max": 140960,
    "latency_mean": 7712.66,
    "latency_stdev": 5459.7,
    "duration": 10023077,
    "requests": 66291,
    "bytes": 187206013,
    "req_per_sec": 6613.84,
    "byte_per_sec": 18677499.24
  },
  {
    "name": "egg ejs view",
    "latency_min": 342,
    "latency_max": 64918,
    "latency_mean": 6455.52,
    "latency_stdev": 3241.16,
    "duration": 10102688,
    "requests": 76587,
    "bytes": 217890072,
    "req_per_sec": 7580.85,
    "byte_per_sec": 21567534.5
  },
  {
    "name": "egg nunjucks view (Async Await)",
    "latency_min": 795,
    "latency_max": 49536,
    "latency_mean": 7074.1,
    "latency_stdev": 3623.01,
    "duration": 10014379,
    "requests": 70171,
    "bytes": 198584087,
    "req_per_sec": 7007.02,
    "byte_per_sec": 19829895.29
  },
  {
    "name": "egg ejs view (Async Await)",
    "latency_min": 408,
    "latency_max": 35333,
    "latency_mean": 6497.54,
    "latency_stdev": 2952.9,
    "duration": 10023491,
    "requests": 75555,
    "bytes": 215407364,
    "req_per_sec": 7537.79,
    "byte_per_sec": 21490253.65
  },
  {
    "name": "egg passport",
    "latency_min": 581,
    "latency_max": 73491,
    "latency_mean": 4329.88,
    "latency_stdev": 2349.59,
    "duration": 10009915,
    "requests": 113975,
    "bytes": 39891254,
    "req_per_sec": 11386.21,
    "byte_per_sec": 3985174.1
  },
  {
    "name": "egg passport (Async Await)",
    "latency_min": 268,
    "latency_max": 55971,
    "latency_mean": 4076.9,
    "latency_stdev": 1674.84,
    "duration": 10101572,
    "requests": 119299,
    "bytes": 42231846,
    "req_per_sec": 11809.94,
    "byte_per_sec": 4180720.19
  }
]

[mention-bot]

@joyeecheung, thanks for your PR! By analyzing the history of the files in this pull request, we identified @fengmk2 and @popomore to be potential reviewers.