Memory usage of fresh nginx

[etrader]

They are two separate servers with fresh installation. I mean what can
be the cause of this double memory usage in the nginx setting. For some
reason, php-fpm is consuming double memory; or maybe fastcgi interface
is doing this. I'm just curious to know what setting can be the cause.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,207506,207597#msg-207597