A friend pointed this out: http://www.brendangregg.com/linuxperf.html Observability, methodologies, benchmarking, profiling, etc, for performance tuning, which is a subject few may find useful, but I thought I would share it. There are some youtube videos of his talks. (The guy works at Netflix, so he must have some aim to covering performance issues on massive content-distribution, etc, which some here may find useful.)