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➜  ~ perfer -t2 -c2 -d2 http://localhost:4000 
*-*-* Only one URL is allowed.

usage: perfer [options] <server-address>

Saturates a web server with HTTP requests while tracking the number of requests,
latency, and throughput. After the duration specified no more requests are sent
and the application terminates when all responses have been received or 10
seconds, which ever is sooner.

  -h                      This help page.
  --help

  -v                      Verbose mode.

  --version               Version of this application.

  -d <duration>           Duration in seconds for the run. Positive decimal
  --duration <duration>   values are accepted.

  -m <rate>               Set a metering rate in request per second.
  --meter <rate>          (default: 0, indicating no metering)

  -t <number>             Number of threads to use for sending requests and
  --threads <number>      receiving responses. (default: 1)

  -c <number>             Total number of connection to use for sending
  --connections <number>  requests (default: 1)

  -b <number>             Maximum backlog for pipeline on a connection.
  --backlog <number>      (default: 1, range 1 - 15)

  -l <percent,...>        Percentages of latency spread to report.
  --latency <percent,...> (example: 10,20,30,40,50,60,70,80,90,99)

  -g <wide>x<high>        Print a latency graph with the dimensions specified.
  --graph <wide>x<high>

  -r <file>               File with the full content of the HTTP request.
  --request <file>        The -keep-alive option is ignored.

  -k                      Keep connections alive instead of closing.
  --keep-alive

  -a <name: value>        Add an HTTP header field with name and value.
  --add <name: value>

  -p <content>            HTTP POST with the content provided.
  --post <content>        example: -p 'mutation { repeat(word: "Hello") }'

  -j                      JSON output.
  --json

  <url>                   URL for requests.
                          example: http://localhost:6464/index.html