Webpages are loading very slow, it takes them around 6 seconds to even start sending the page data, which is then sent in a matter of 0.2 seconds and is generated in 0.19 seconds.
I doubt that it is caused by php or the browser, so the problem must be with the server which is handled by nginx and php5-fpm
A server admin said that indeed the problem was caused by a misconfigured fpm or nginx
How can I debug the cause of the slowdown?
Setup: php5.3, mysql5, linux, nginx, php5-fpm
This question is probably too broad for StackOverflow, as the question could span several pages and topics.
However if the question was just how do I do debug the performance of PHP-FPM then the answer would be much easier - use Strace and the script below.
#!/bin/bash
mkdir trc
rm -rf trc/*.trc
additional_strace_args="$1"
MASTER_PID=$(ps auwx | grep php-fpm | grep -v grep | grep 'master process' | cut -d ' ' -f 7)
summarise=""
#shows total of calls - comment in to get
#summarise="-c"
nohup strace -r $summarise -p $MASTER_PID -ff -o ./trc/master.follow.trc >"trc/master.$MASTER_PID.trc" 2>&1 &
while read -r pid;
do
if [[ $pid != $MASTER_PID ]]; then
#shows total of calls
nohup strace -r $summarise -p "$pid" $additional_strace_args >"trc/$pid.trc" 2>&1 &
fi
done < <(pgrep php-fpm)
read -p "Strace running - press [Enter] to stop"
pkill strace
That script will attach strace to all of the running php-fpm instances. Any requests to the web server that reach php-fpm will have all of their system calls logged, which will allow you to inspect which ones are taking the most time, which will allow you to figure out what needs optimising first.
On the other hand, if you can see from the Strace output that PHP-FPM is processing each request fast, it will also allow you to eliminate that as the problem, and allow you to investigate nginx, and how nginx is talking to PHP-FPM, which could also be the problem.
mkdir statement to mkdir -p, and the MASTER_PID=$(.....) line for MASTER_PID=$(pgrep -f "php-fpm: master process")@Danack saved my life. But I had to change the command to get the MASTER_PID:
MASTER_PID=$(ps auwx | grep php-fpm | grep -v grep | grep 'master process' | sed -e 's/ \+/ /g' | cut -d ' ' -f 2)
