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wodeguaiguai
/ listen1_aha_playlist.md
Last active
October 31, 2023 08:24
updated by Listen1(https://listen1.github.io/listen1/) at 2023/10/31下午4:24:38
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| # -*- coding: utf-8 -*- | |
| # update.py | |
| # @author wodeguaiguai | |
| # @description | |
| # @created 2020-01-02T21:49:39.000Z+08:00 | |
| # @last-modified 2020-01-03T23:08:13.251Z+08:00 | |
| # | |
| import os | |
| import sys |
wodeguaiguai
/ latency.markdown
Created
February 23, 2019 16:43
— forked from hellerbarde/latency.markdown
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