John G G john-g-g

## Matrix.md

      
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                nadavrot
                / Matrix.md
            
            
              Last active
              May 22, 2024 13:38
            
              
                Efficient matrix multiplication
              
          
    High-Performance Matrix Multiplication

This is a short post that explains how to write a high-performance matrix
multiplication program on modern processors. In this tutorial I will use a
single core of the Skylake-client CPU with AVX2, but the principles in this post
also apply to other processors with different instruction sets (such as AVX512).
Intro

Matrix multiplication is a mathematical operation that defines the product of

  
## sysctl.conf
### KERNEL TUNING ###

# Increase size of file handles and inode cache
fs.file-max = 2097152

# Do less swapping
vm.swappiness = 10
vm.dirty_ratio = 60
vm.dirty_background_ratio = 2

## YubiKey-GPG-SSH-guide.md

      
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                ageis
                / YubiKey-GPG-SSH-guide.md
            
            
              Last active
              May 20, 2024 09:52
            
              
                Technical guide for using YubiKey series 4 for GPG and SSH
              
          
    YubiKey 4 series GPG and SSH setup guide

Written for fairly adept technical users, preferably of Debian GNU/Linux, not for absolute beginners.


You'll probably be working with a single smartcard, so you'll want only one primary key (1. Sign & Certify) and two associated subkeys (2. Encrypt, 3. Authenticate). I've published a Bash function which automates this slightly special key generation process.

  
## Install_Python_Ubuntu.sh
#!/bin/bash
# This script will install specific versions of Python on Ubuntu Linux servers
if [ "$(whoami)" != "root" ]; then
    echo "WARNING: You must run this script as 'root'"
    # This shortcut method will fail if the script file does not have execute permissions
    exec sudo -- "$0" "$@"
fi

inputVersion=$1
if [[ $inputVersion == "" ]]; then

## 0 ProPublica Tor hidden service config.md

      
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                mtigas
                / 0 ProPublica Tor hidden service config.md
            
            
              Last active
              April 10, 2023 16:31
            
              
                Configuration for ProPublica’s Tor hidden service proxy.
              
          
    Note (December 16, 2021): These example files haven't been updated since 2016. In either 2019 or 2020, our onion domain was changed to a longer v3 onion address (p53lf57qovyuvwsc6xnrppyply3vtqm7l6pcobkmyqsiofyeznfu5uqd.onion). The examples below don't reflect this, but the configuration portions remain accurate regarding how we currently serve the onion site. (Tor Browser dropped support for v2 addresses, such as propub3r6espa33w.onion, in the second half of 2021.)

These files contain the base configuration for ProPublica’s Tor hidden service mirror.
Of note:

We're using the nginx "subs_filter" and "headers more" modules to allow us to rewrite content and update headers, so that we can convert clearnet links into onion links, where possible.


## make-time-machine-work.sh
#!/bin/bash

###
### This is the script I use to setup time machine to work with my LinkSys attched NAS (USB 3.0 Hard Drive)
###

#### Configurable Parameters #########

SIZE=300g
NAME="Z.org Time Machine Backup"

## pre-commit
#!/bin/sh

if git rev-parse --verify HEAD >/dev/null 2>&1
then
    against=HEAD
else
    # Initial commit: diff against an empty tree object
    against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi


## btree_bloat.sql
/* The bloat estimation queries moved to this respository:
* https://github.com/ioguix/pgsql-bloat-estimation
*/

## gist:11118694
#!/bin/bash
# A bash script to create a time machine disk image suitable for
# backups with OS X 10.6 (Snow Leopard)
# This script probably only works for me, so try it at your own peril!
# Use, distribute, and modify as you see fit but leave this header intact.
# (R) sunkid - September 5, 2009
#
# This will create a time machine ready disk image named with your
# computer's name with a maximum size of 600GB and copy it to
# /Volumes/backup. The image "file" (it's a directory, really) will

## index.html
<html lang="en">
<head>

</head>
<body>


<pre>
    <script type="text/javascript">
	### KERNEL TUNING ###

	# Increase size of file handles and inode cache
	fs.file-max = 2097152

	# Do less swapping
	vm.swappiness = 10
	vm.dirty_ratio = 60
	vm.dirty_background_ratio = 2
	#!/bin/bash
	# This script will install specific versions of Python on Ubuntu Linux servers
	if [ "$(whoami)" != "root" ]; then
	echo "WARNING: You must run this script as 'root'"
	# This shortcut method will fail if the script file does not have execute permissions
	exec sudo -- "$0" "$@"
	fi

	inputVersion=$1
	if [[ $inputVersion == "" ]]; then
	#!/bin/bash

	###
	### This is the script I use to setup time machine to work with my LinkSys attched NAS (USB 3.0 Hard Drive)
	###

	#### Configurable Parameters #########

	SIZE=300g
	NAME="Z.org Time Machine Backup"
	#!/bin/sh

	if git rev-parse --verify HEAD >/dev/null 2>&1
	then
	against=HEAD
	else
	# Initial commit: diff against an empty tree object
	against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
	fi
	/* The bloat estimation queries moved to this respository:
	* https://github.com/ioguix/pgsql-bloat-estimation
	*/
	#!/bin/bash
	# A bash script to create a time machine disk image suitable for
	# backups with OS X 10.6 (Snow Leopard)
	# This script probably only works for me, so try it at your own peril!
	# Use, distribute, and modify as you see fit but leave this header intact.
	# (R) sunkid - September 5, 2009
	#
	# This will create a time machine ready disk image named with your
	# computer's name with a maximum size of 600GB and copy it to
	# /Volumes/backup. The image "file" (it's a directory, really) will
	<html lang="en">
	<head>

	</head>
	<body>


	<pre>
	<script type="text/javascript">