strace_php-fpm []

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The following command straces all php-fpm processes and places the output in separate files for each process:

strace -ff -tt -o /tmp/php.trace/trace  -s1024 -p `pidof php-fpm | tr ' ' ','`

Flag	Definition
-tt	Time printed will include microseconds
-o	Output file
-ff	If -o is specified, each process traced will have its own file name
-s	string size
-p	PID
tr	Translate, squeeze, or delete characters from stdin, writing to stdout