kalinchernev

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jorgenpt

#pragma once

#define _CheckTypes(a,b) _Static_assert(_Generic(a, typeof (b):1, default: 0), "Mismatched types")

#define Min(a,b) \
    ({ \
        const typeof (a) _a = (a); \
        const typeof (b) _b = (b); \
        _CheckTypes(_a,_b); \
        (_a < _b ? _a : _b); \

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs