littlekorea writes: HipHop Virtual Machine engineer Joel Pobar has provided new insights into the software release cycle at Facebook. Among their arsenal — a tool that replays 24 hours of global activity on Facebook.com in under 45 minutes to test changes against production workloads, and another that allows a dev to switch new features into production in one country or demographic to test its uptake. It appears New Zealand is most often the first to experience new features.
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals