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@jboner
jboner / latency.txt
Last active July 17, 2024 03:12
Latency Numbers Every Programmer Should Know
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
@rsheldiii
rsheldiii / adfgvx.py
Created June 27, 2012 00:27
adfgvx brute force decryptor. decryption based on wordlist and caesar shift of the alphabet, using the fact that space will be the most prevalent letter
def encodingDict(scrambledAlphabet):
adfgvxIndex = ['A','D','F','G','V','X']
encodeDict = {}
for i in range(0,6):
for j in range(0,6):
encodeDict[scrambledAlphabet[i*6+j]] = adfgvxIndex[i]+adfgvxIndex[j]
return encodeDict
def DecryptOnSpace(encryptedString,codeWord):
@rxaviers
rxaviers / gist:7360908
Last active July 17, 2024 07:57
Complete list of github markdown emoji markup

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@PurpleBooth
PurpleBooth / README-Template.md
Last active July 17, 2024 03:47
A template to make good README.md

Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites