Which code is faster?
Published in
1 min readMar 15, 2019
Both functions read and sum 32 MB of data, enough data to force CPU to miss all caches and read from main RAM. Using Google Benchmark to measure.
Computer: iMac 27" Retina 2014, Intel(R) Core(TM) i7–4790K @ 4.00GHz, 16 GB RAM.
CPU Caches:
L1 Data 32K (x4)
L1 Instruction 32K (x4)
L2 Unified 262K (x4)
L3 Unified 8388K (x1)
