The Megahertz episode artwork

EPISODE · Jul 12, 2025 · 1H 42M

The Megahertz

from core.py · host Pablo Galindo and Łukasz Langa

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

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

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The Megahertz

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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...

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