ab

ab - Apache HTTP server benchmarking tool
apt install apache2-utils
Sample usage

 ab -n 10 -c 10 http://labs.bitarus.allowed.org/
This is ApacheBench, Version 2.3 <$Revision: 1528965 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking labs.bitarus.allowed.org (be patient).....done


Server Software:        Apache/2.4.7
Server Hostname:        labs.bitarus.allowed.org
Server Port:            80

Document Path:          /
Document Length:        861 bytes

Concurrency Level:      10
Time taken for tests:   0.031 seconds
Complete requests:      10
Failed requests:        0
Total transferred:      11620 bytes
HTML transferred:       8610 bytes
Requests per second:    319.15 [#/sec] (mean)
Time per request:       31.333 [ms] (mean)
Time per request:       3.133 [ms] (mean, across all concurrent requests)
Transfer rate:          362.16 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        1    2   2.0      1       5
Processing:     5   16   6.6     19      25
Waiting:        5   16   6.6     19      25
Total:          6   18   8.0     20      30

Percentage of the requests served within a certain time (ms)
  50%     20
  66%     22
  75%     25
  80%     28
  90%     30
  95%     30
  98%     30
  99%     30
 100%     30 (longest request)