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@kconner
kconner / macOS Internals.md
Last active May 25, 2024 19:26
macOS Internals

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

Starting Points

How to use this gist

You've got two main options:

@darconeous
darconeous / rect-starlink-cable-hack.md
Last active March 22, 2024 14:45
Hacking the Rectangular Starlink Dishy Cable
@jarun
jarun / disassemble.md
Last active April 26, 2024 14:18
Guide to disassemble

prerequisites

  • Compile the program in gcc with debug symbols enabled (-g)
  • Do NOT strip the binary
  • To generate assembly code using gcc use the -S option: gcc -S hello.c

utilities

objdump

Quick Tips for Fast Code on the JVM

I was talking to a coworker recently about general techniques that almost always form the core of any effort to write very fast, down-to-the-metal hot path code on the JVM, and they pointed out that there really isn't a particularly good place to go for this information. It occurred to me that, really, I had more or less picked up all of it by word of mouth and experience, and there just aren't any good reference sources on the topic. So… here's my word of mouth.

This is by no means a comprehensive gist. It's also important to understand that the techniques that I outline in here are not 100% absolute either. Performance on the JVM is an incredibly complicated subject, and while there are rules that almost always hold true, the "almost" remains very salient. Also, for many or even most applications, there will be other techniques that I'm not mentioning which will have a greater impact. JMH, Java Flight Recorder, and a good profiler are your very best friend! Mea

@gabonator
gabonator / camera.md
Created June 4, 2016 13:48
Cheap chinese IP camera with H264 encoding based on Hisilicon 8M (Hi3518E) chip

Cheap chinese IP camera with H264 encoding based on Hisilicon 8M (Hi3518E) chip

Video stream url for VLC/DVR:

  • rtsp://192.168.1.93:554/user=admin&password=&channel=&stream=.sdp?real_stream--rtp-caching=100

Telnet access

  • telnet 192.168.1.10 23
  • Localhost login: root
  • Password: xmhdipc