Some nginx ram oddities
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 19587 nginx 15 0 24296 17m 1300 S 2.3 14.7 20:26.89 nginx
it's the biggest ram consuming process, using more than MySQL or 1 PHP process unless I'm looking at something wrong. Then I went back after writing most of this post and it was down to 6mb. Last night I saw 57mb in the RES column for nginx.
Also, free -m reports less ram used than the use reported by the RES column for just the top 5 processes.