On: Musings on Tracing in PyPy

[cfbolztereick]

And a significant chunk of these important extension libraries are supported in pypy using the emulated C-extension api (cpyext)

[kragen → cfbolztereick]

Right, the performance cost of cpyext is what we're contrasting with ctypes-like approaches like LuaJIT's FFI in this thread. In https://news.ycombinator.com/item?id=42656395 Antonio Cuni linked the standard explanation of why cpyext is so slow and also HPy, which I'm embarrassed to say I didn't know about.