> The results with defaults including ‘access_log /var/log/nginx/access.log;’
> show the Requests/sec ramping up to ~24.5K and staying there.

> The results with defaults and access_log changed to ‘access_log off;’ show
the Requests/sec initially ramping up to ~28.5K but then decreasing down to
~20K and staying there.
> The NGINX config is at the bottom.
> Can someone explain possible reasons for this behavior?

First of all you should probably somehow format your benchmark results in
more readable format (table or something) as looking at them now is
counterintuitive (also it's better to keep the configuration at minimum and
no need for default config files like mime.types etc).


Second - against what exactly are you testing?

As your benchmark numbers looked odd (and somewhat low) out of interest I
did few tests against bare 1.10.3 nginx (the default index.htm) page (on a
server with 12 cores - nginx runs on 8 workers).

I took your heaviest test -t32 -c1000 -d1m (32 threads and 1000 connections)
without access_log:

Running 1m test @ http://<ip>/
32 threads and 1000 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 65.40ms 140.79ms 1.96s 92.52%
Req/Sec 4.06k 1.34k 25.27k 75.02%
7746479 requests in 1.00m, 6.13GB read
Requests/sec: 128893.40
Transfer/sec: 104.48MB

With access_log:

32 threads and 1000 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 84.17ms 193.73ms 2.00s 92.17%
Req/Sec 4.05k 1.48k 36.23k 74.44%
7724438 requests in 1.00m, 6.11GB read
Requests/sec: 128526.82
Transfer/sec: 104.18MB

And I'm bassically limited to the 1Gbit network between servers (I'll try to
test on some higher core machine later so there is one nginx worker for each
Wrk thread and/or running on the same box againt 'lo') but I couldn't
replicate any significant difference of having the log on or off.

rr



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