strace命令详解 http://linux.die.net/man/1/strace
strace -tt -T $(pidof ‘php-fpm: pool www‘ | sed ‘s/\([0-9]*\)/\-p \1/g‘)
strace 监控所有php-fpm worker
原文：http://www.cnblogs.com/sanshuiqing/p/4738766.html
