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alvarow / print-headers.jsp
Last active Apr 10, 2020
Print HTTP request headers in JSP
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<%@ page import="java.util.*" %>
<title>Http Request Headers Example in JSP</title>
<h2>HTTP Request Headers Received</h2>
dergachev /
Last active Sep 22, 2020
OS X Screencast to animated GIF

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Screencapture GIF


To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

jboner / latency.txt
Last active Sep 23, 2020
Latency Numbers Every Programmer Should Know
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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
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