for some time, I've seen that demo server has sometimes problems to fit
into memory. Today I've finally found time to look at the issue and it
turned out to be caused by huge session data (many of sessions were
around 3MiB), which did contain all global variables.
The issue is fixed in master (8b26dc5), but I'm just mentioning this if
you see somebody complaining about this behavior in alpha release.
Michal Čihař | http://cihar.com | http://blog.cihar.com