memory-analyzer

ps aux | grep 'httpd' | awk '{print "PID ->"  $2 " MEM ->"  $6/1024 " MB";}'
watch -n 1 "echo -n 'Apache Processes: ' && ps -C httpd --no-headers | wc -l && free -m"
ps -ylC httpd --sort:rss | awk '{sum+=$8; ++n} END {print "Tot="sum"("n")";print "Avg="sum"/"n"="sum/n/1024"MB"}'

1) process tree
 pstree -p | grep httpd

2) sessions memory
ps aux | grep 'httpd' | awk '{print "PID ->"  $2 " MEM ->"  $6/1024 " MB";}'

3) run strace 
strace -p 6450 -ff -o http-trace