Tim Bradshaw

SpaceX has leapfrogged Amazon to become the world’s fifth most valuable company as it extends a blistering rally following its record-breaking initial public offering. SpaceX shares climbed as much as 14 per cent on Tuesday, its third day of trading after... See more

The parable of the plough Let me tell you the parable of the plough, as related to me by a wandering preacher in the high country, long ago. A wandering preacher came upon a farmer. The land was fertile, but the farmer was thin and his family was thin. ‘W... See more

Measuring slot access cost in Common Lisp I’ve been interested in how slow CLOS slot access is in Common Lisp. Here’s how I measured it. I wanted to compare the cost of access to fields of various objects in Common Lisp. In particular I wanted to get a fe... See more

Making CLOS slot access less slow Access to slots in CLOS instances is often very slow. It’s probably not possible for it ever to be really fast, but the AMOP MOP does provide a way of making it, at least, less slow. How slow is it? Here are some benchmar... See more

Structures of arrays Or, second system. A while ago, I decided that I’d like to test my intuition that Lisp (specifically implementations of Common Lisp) was not, in fact, bad at floating-point code and that the ease of designing languages in Lisp could m... See more