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@hellerbarde
hellerbarde / latency.markdown
Created May 31, 2012 13:16 — forked from jboner/latency.txt
Latency numbers every programmer should know

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

@angristan
angristan / hosts
Last active May 31, 2020 15:00
Windows 10 Privacy Hosts file
0.0.0.0 choice.microsoft.com
0.0.0.0 choice.microsoft.com.nsatc.net
0.0.0.0 df.telemetry.microsoft.com
0.0.0.0 diagnostics.support.microsoft.com
0.0.0.0 feedback.microsoft-hohm.com
0.0.0.0 feedback.search.microsoft.com
0.0.0.0 feedback.windows.com
0.0.0.0 oca.telemetry.microsoft.com
0.0.0.0 oca.telemetry.microsoft.com.nsatc.net
0.0.0.0 onesettings-bn2.metron.live.com.nsatc.net
@spences10
spences10 / github-cheat-sheet.md
Last active March 22, 2022 17:59
GitHub Cheat Sheet

Useful Git commands

This is just stuff that I have put down that I find I use a lot of the time for my own reference.

Latest changes from repo to your machine

$ git pull