3 ms·

Why LA, # of drivers, size of the city or # of users? Quick googling says LA is 500 miles squared, with Beijing being 6500. The only case where I see 1 server

by latch 11y ago

Why LA, # of drivers, size of the city or # of users? Quick googling says LA is 500 miles squared, with Beijing being 6500. The only case where I see 1 server failing is # of requests. All their drivers in the world probably fit in a few GB of memory (if that). 99% of a car's movement requires no locking (they stay in the same block), so there's very little write locking...I dunno...give it a 24 core server (or more)... Maybe the problem is node and python. I don't know python runtime well enough, but this kind of setup is a nightmare for node. Sharing data across processes just isn't what it was meant to do (it rather fork and have a copy, but then your memory doubles per fork, and you have to keep it in sync). That's true for a lot of dynamic languages.

msandford 11y ago
Just using the google answer for "how big is LA" doesn't really cut it as there are millions of people that live outside of LA proper but still in the region that most people would call "LA". If you go to Wikipedia for Greater Los Angeles it's 34,000 square miles. https://en.wikipedia.org/wiki/Greater_Los_Angeles_Area https://en.wikipedia.org/wiki/Greater_Los_Angeles_Area sqrt(34000) is nearly 200 miles on a side. And that doesn't really even cover all the areas that one might Uber from or to. So you'll have a lot of people crossing shard boundaries. Greater LA has some 18mm residents, and again that doesn't count some of the places very close but not really IN the area. Places you might drive to in 15 minutes from the edge, over a pass.