Comment by zephen
7 hours ago
> it’s quite impressive how much faster PUC Lua is than QuickJS and Python
Python's execution time is mostly spent looking up stuff. I don't think lua is quite as dynamic.
7 hours ago
> it’s quite impressive how much faster PUC Lua is than QuickJS and Python
Python's execution time is mostly spent looking up stuff. I don't think lua is quite as dynamic.
Lua is way more dynamic
I suppose it depends on where you are looking for dynamicity. In some ways, lua is much more laissez faire of course.
But in Python, everything is an object, which is why, as I said, it spends much of its time looking things up. And things like bindings for closures are late, so that's more lookups as well.
In lua, many things aren't objects, and, for example, you can add two numbers without looking anything up. Another issue, of course, when you do that, is that you could conceivably overflow an integer, but that can't happen in Python either.
The Python interpreter has some fast paths for specific object types, but it is really limited in the optimizations it can do, because there simply aren't any unboxed types.
Nop, Python is not full object. Not even Ruby is fully object, try `if.class` for example. Self, Smalltalk, Lisp, and Io are fully object in that sense. But none as far as I know can handle something like `(.class`.
4 replies →