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Your CPU may have slowed down on Wednesday
The death of hardware store optimization.
Travis Downs
A blog about low-level software and hardware performance.
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Visit travisdowns.github.io → RSS feedOn Hacker News Jun 2019 – Jun 2021
Systems & Performance 9Hardware & Electronics 6Software Engineering 3
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Clang Format Tanks Performance
Can using clang-format make your code slower? Kind of.
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Performance Speed Limits
A laundry list of speed limits that your code can’t exceed.
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Where do interrupts happen?
Trying to determine exactly where asynchronous interrupts are delivered on Intel CPUs.
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A Concurrency Cost Hierarchy
Concurrent operations can be grouped relatively neatly into categories based on their cost
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The Hunt for the Fastest Zero
Unexpected performance deviations depending on how you spell zero.
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Ice Lake AVX-512 Downclocking
Examining the extent of AVX related downclocking on Intel’s Ice Lake CPU
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Gathering Intel on Intel AVX-512 Transitions
Investigating some details of SIMD related frequency transitions on Intel CPUs.
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AVX-512 Mask Registers, Again
Taking a second look at the newly introduced mask registers, this time with the benefit of a SKX die shot from Fritzchens Fritz.