What is curious is that RAM is still available, with this error. Monitoring CPU (using top) shows CPU % is about 70% for apache2 (70% is probably capped by my VPS host, given to each VPS slice).
And this occurs for a very simple app. I hope Massimo or someone else can reproduce this error with this app. Note that while testing with ab, you might have to browse the site, clicking on images, etc. Otherwise, ab just it the same domain name repeatedly.
