ryan ryanwoodsmall

To limit a CPU to a certain C-state, you can pass the processor.max_cstate=X option in the kernel line of /boot/grub/grub.conf.

Here we limit the system to only C-State 1:

    kernel /vmlinuz-2.6.18-371.1.2.el5 ... processor.max_cstate=1

On some systems, the kernel can override the BIOS setting, and the parameter intel_idle.max_cstate=0 may be required to ensure sleep states are not entered:

some tools for diagrams in software documentation

Diagrams For Documentation

Obvious Choices

ASCII

To remove a submodule you need to:

Delete the relevant section from the .gitmodules file.
Stage the .gitmodules changes git add .gitmodules
Delete the relevant section from .git/config.
Run git rm --cached path_to_submodule (no trailing slash).
Run rm -rf .git/modules/path_to_submodule (no trailing slash).
Commit git commit -m "Removed submodule "
Delete the now untracked submodule files rm -rf path_to_submodule

The following shell transcript shows how to:

Create a GPG key
Create a pass database
Add git support to the pass database
Create a remote git repository
Push the pass database to the remote git repository
Fetch and display your passwords from another host

It is assumed that the pass package has been installed on both the first and second computers.

Introductory Material

Add Graal JIT Compilation to Your JVM Language in 5 Steps, A Tutorial http://stefan-marr.de/2015/11/add-graal-jit-compilation-to-your-jvm-language-in-5-easy-steps-step-1/
The SimpleLanguage, an example of using Truffle with great JavaDocs. It is the officle getting-started project: https://github.com/graalvm/simplelanguage
Truffle Tutorial, Christan Wimmer, PLDI 2016, 3h recording https://youtu.be/FJY96_6Y3a4 Slides

On the server with tmux

Create a new tmux session:

tmux new-session -s my-session # launch `top`, `htop`, or anything that will regularly updates, then detach

Stream your session:

Raspberry Pi Zero OTG Mode

Simple guide for setting up OTG modes on the Raspberry Pi Zero - By Andrew Mulholland (gbaman).

The Raspberry Pi Zero (and model A and A+) support USB On The Go, given the processor is connected directly to the USB port, unlike on the B, B+ or Pi 2 B, which goes via a USB hub.
Because of this, if setup to, the Pi can act as a USB slave instead, providing virtual serial (a terminal), virtual ethernet, virtual mass storage device (pendrive) or even other virtual devices like HID, MIDI, or act as a virtual webcam!
It is important to note that, although the model A and A+ can support being a USB slave, they are missing the ID pin (is tied to ground internally) so are unable to dynamically switch between USB master/slave mode. As such, they default to USB master mode. There is no easy way to change this right now.
It is also important to note, that a USB to UART serial adapter is not needed for any of these guides, as may be documented elsewhere across the int

	#!/usr/bin/env bash

	# names of latest versions of each package
	export NGINX_VERSION=1.15.5
	export VERSION_NGINX=nginx-$NGINX_VERSION
	export VERSION_LIBRESSL=libressl-2.8.1
	export VERSION_PCRE=pcre-8.42
	#export NPS_VERSION=1.9.32.10
	#export VERSION_PAGESPEED=v${NPS_VERSION}-beta

	// A small SSH daemon providing bash sessions
	//
	// Server:
	// cd my/new/dir/
	// #generate server keypair
	// ssh-keygen -t rsa
	// go get -v .
	// go run sshd.go
	//
	// Client:

	#!/bin/bash
	### BEGIN INIT INFO
	# Provides: zram
	# Required-Start:
	# Required-Stop:
	# Default-Start: 2 3 4 5
	# Default-Stop: 0 1 6
	# Short-Description: Virtual Swap Compressed in RAM
	# Description: Virtual Swap Compressed in RAM
	### END INIT INFO