JamesHopbourn

玩法文章

• Hum 151010 URL Schemes 使用详解
• Hum 160427 OmniFocus 的 URL Schemes 用法
• Hum 171115 通过 Bear 来认识 Launch Center Pro 的进阶用法
• Hum 171122 通过 Bear 来认识 Drafts 的 [[line]] 用法
• Hum 180518 入门 iOS 自动化：读懂 URL Schemes
• Hum 180823 Universal Link 使用详解
• Hum 181229 x-callback-URL 的使用方法
• JamesHopbourn 210204 Drafts + vim = URL Scheme 复用
• JamesHopbourn 210405 Drafts 5 与 Bear 联手，让我可以快速追加笔记

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

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD