Virtual machines and time drift

VMWare: "Timekeeping in VMWare Virtual Machines" Because virtual machines work by time-sharing host physical hardware, they cannot exactly duplicate the timing activity of physical machines. VMware® virtual machines use several techniques to minimize and conceal differences in timing performance, but the differences can still sometimes cause timekeeping inaccuracies and other problems in software running in … Continue reading Virtual machines and time drift

WordPress core functions that don’t scale

Automattic's WordPress.com VIP platform has advice on uncached WordPress functions: WordPress core has a number of functions that, for various reasons, are uncached, which means that calling them will always result in an SQL query. Below, we outline some of these functions. We have a helper file with cached versions of some of the functions, … Continue reading WordPress core functions that don’t scale