nginx -s reload terminates connections

[JackB]

With a plain standard configuration I can confirm behavior of wrk on Ubuntu
16.04 (Linux 4.4.0):

Running without reload during run:

$ wrk -d 30 -c 100 -t 20 http://localhsot/
Running 30s test @ http://localhost/
  20 threads and 100 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     2.45ms    0.89ms  29.75ms   86.77%
    Req/Sec     2.07k   279.09     5.32k    78.41%
  1241732 requests in 30.10s, 1.45GB read
Requests/sec:  41248.07
Transfer/sec:     49.25MB


Calling reload one time during run:

$ wrk -d 30 -c 100 -t 20 http://localhost/
Running 30s test @ http://localhost/
  20 threads and 100 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     5.34ms    8.76ms  91.81ms   85.10%
    Req/Sec     1.22k     0.86k    5.43k    58.83%
  688865 requests in 30.10s, 822.49MB read
  Socket errors: connect 0, read 39, write 0, timeout 0
Requests/sec:  22887.01
Transfer/sec:     27.33MB


Could not verify a connection termination with a reload during a long
running request. Might be a "problem" with wrk?

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,275328,275329#msg-275329