The Megahertz

Python 3.14? That's old news. Let's talk about the first big feature of Python 3.15 -- a built-in sampling profiler for Linux, macOS, and Windows. We also cover improvements in perf support, discuss memory.python.org, and as usual, recent changes in the codebase. ## Timestamps (00:00:00) INTRO (00:02:43) PART 1: THE SAMPLING PROFILER (00:05:07) Built-in profile is bad, long live cProfile (00:10:54) Out-of-process profiling (00:12:18) Shortcuts Compromise Accuracy, Leading Eventually to Numerous Errors (00:16:07) Selfish Łukasz vs benevolent Pablo (00:23:11) How does a sampling profiler even work? (00:30:42) One meeellion huuurtzzz (00:32:40) Free threading makes it extra spicy (00:41:26) AsyncIO makes it even spicier (00:49:49) You made this? I made this (00:54:06) What if the profiled process changes during sampling? (00:57:33) Coming in October 2026 (01:04:30) PART 2: PR OF THE WEEEEEEK (01:14:14) memory.python.org launched (01:23:15) PART 3: WHAT'S GOING ON IN CPYTHON (01:26:45) Performance updates (01:30:24) Features & Curiosities (01:41:45) OUTRO