Optimizing Memory Copy Performance: A Faster Alternative to memcpy
By
snihalani
Baker's choice. Dense with flavour, light on filler.
Summary
The article discusses optimizing memory copy operations in software development, specifically addressing the inefficiency of `memcpy` for large binary messages (>512kB). The author explores an alternative implementation using AVX to copy 32 bytes at a time, aiming to improve performance.
Key quotes
· 3 pulledWhile profiling Shadesmar a couple of weeks ago, I noticed that for large binary unserialized messages (>512kB) most of the execution time is spent doing copying the message (using memcpy) between process memory to shared memory and back.
__memmove_avx_unaligned_erms is an implementation of memcpy for unaligned memory blocks that uses AVX to copy over 32 bytes at a time.
I had a few hours to kill last weekend, and I tried to implement a faster way to do memory copies.
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