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Overview
Daniel Lemire's blog. Daniel Lemire is a software performance expert. He ranks among the top 2% of scientists globally (Stanford/Elsevier 2025) and is one of GitHub's top 1000 most followed developers.
News
AI programming : are you angry yet?
AI-assisted programming is fast evolving and there is a tension between 'we no longer need to understand the code' and 'what is my purpose as a programmer'. I recorded a short video on this topic with how I think the tension can result in conflicts.
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Profile-guided optimization in Go
When a compiler optimizes your program, it has to guess. Which functions are worth inlining? Which side of a branch is the common one? Which method does this interface call actually reach? At compile time it cannot know, so it uses heuristics. Profile-gui
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How fast is C++26's std::hive?
C++26 adds a new container to the standard library: std::hive. It is meant to occupy the ground between std::vector and std::list. Like a vector, it keeps its elements in contiguous blocks of memory, so scanning it does not require you to chase a pointer
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Memory-level parallelism: AMD is the king
When your program asks for memory that is not in cache, the processor has to go to RAM. That trip costs on the order of 100 nanoseconds. On a 3 GHz core, that is about 300 cycles of doing nothing. Memory latency has not improved in ten years. The 2016 Bro
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Does a PhD Pay Off?
Every week, I discuss with people who want to get a PhD. For years, I have been advising people not to pursue a PhD. It may come as a surprise to some. You would expect people with a PhD to earn more money. Individuals who complete doctorates tend to have
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