How to make statistics on the loading time of web pages?

Question

PHP

How to make statistics on the loading time of web pages? I have nginx and php5.6.
For some reason, my SuiteCRM pages take a long time to form.

Answer 1

nginx.org/ru/docs/http/ngx_http_upstream_module.ht...
$upstream_response_time

Answer 2

Set the $upstream_response_time variable to the log file format. I have this in /etc/nginx/nginx.conf:

http {

    ##
    # Basic Settings
    ##
    log_format main     '$remote_addr:$remote_port - $remote_user [$time_local] $host "$request" '
                        '$status $body_bytes_sent "$http_referer" '
                        '"$http_user_agent" "$http_x_forwarded_for" $request_time-$upstream_response_time';
....
}

Then in the logs there are two numbers at the end of the line:
The first digit allows you to identify "slow" clients (when the first digit is large and the second is small). The second shows how long the engine takes to generate pages. Allows you to identify problems on the backend. But such a command allows you to calculate the median of the page generation time:

cat nginx_access.log | awk -F\" '{print $9}' | grep -v ".--$" | awk -F\- '{print $2}' | sort -n | awk '{all[NR]=$1;} END {print all[int(NR*0.5)]}'
1.391

Total backend requests I have today:

cat nginx_access.log | awk -F\" '{print $9}' | grep -v ".--$" | wc -l
74557

Which in total tells me that today 50% (median) of backend requests, i.e. 37288 pieces completed in less than 1.391 seconds. Although I personally prefer to monitor the 85% percentile:

cat nginx_access.log | awk -F\" '{print $9}' | grep -v ".--$" | awk -F\- '{print $2}' | sort -n | awk '{all[NR]=$1;} END {print all[int(NR*0.85)]}'
1.869