GPU programming is only useful in options trading because, in all other spaces, the limiting factor is bandwidth (afaik there are no gpu's with onboard 10g/40g/100g nics, so you have to pass data through PCI or some other bus)
true. Hm... good insight on the topic. So, what kind of programming languages and tools do you use for HFT? I've seen on the internet Erlang being used in the past, now it's said mostly C/C++.
If you happen to work on this sector, tell me smth: why don't you write your software in functional programming, and then use C++ bindings for the CPU intensive code?