how strace php-fpm process?

Question

I am using nginx+php-fpm for php environment and I want to strace the php script execute,but there are many php-fpm worker, so if how can I know which php-fpm worker is handling the script?
if I should monitor all the php-fpm worker,example is as following:

additional_strace_args="$1"

MASTER_PID=$(ps auwx | grep php-fpm | grep -v grep | grep 'master process'  | cut -d ' ' -f 6)

while read -r pid;
do
    if [[ $pid != $MASTER_PID ]]; then
        nohup strace -r -p "$pid" $additional_strace_args >"$pid.trc" 2>&1 &
    fi
done < <(pgrep php-fpm)

score 8 · Accepted Answer · edited Mar 11 '16 at 01:49

8

You can use the -f flag to trace child processes like this:

strace -f $(pidof php-fpm | sed 's/\([0-9]*\)/\-p \1/g')

edited Mar 11 '16 at 01:49

Pang

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answered Mar 11 '16 at 01:29

charles

352
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10

I needed to use `pgrep` as `pidof` didn't find my processes: `strace -f $(pgrep php-fpm | sed 's/$[0-9]*$/\-p \1/g')` – pevik Oct 29 '18 at 09:41
Any method is okay if they can find the process id. – charles Mar 25 '19 at 02:10

how strace php-fpm process?

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