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Henri Menke hmenke

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@pgundlach
pgundlach / viznodelist.lua
Last active January 10, 2022 01:43
LuaTeX nodelist visualization
--
-- viznodelist.lua
-- speedata publisher
--
-- Written 2010-2020 by Patrick Gundlach.
-- This file is released in the spirit of the well known MIT license
-- (see https://opensource.org/licenses/MIT for more information)
--
-- visualizes nodelists using graphviz
@pgundlach
pgundlach / xmlparser.lua
Created April 26, 2012 13:01
XML Parser based on lpeg
-- xml parser
local require,lpeg,io,select,string,type,tonumber,tostring=require,lpeg,io,select,string,type,tonumber,tostring
local w = w
local printtable=printtable
module(...)
bit = require('bit')
local C,P,R,S,V = lpeg.C,lpeg.P,lpeg.R,lpeg.S,lpeg.V
@jboner
jboner / latency.txt
Last active July 24, 2024 06:44
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
@RhysU
RhysU / gist:5281465
Last active March 18, 2021 11:35
Using Boost Spirit 2.1+ to evaluate constant arithmetic expressions. See http://agentzlerich.blogspot.com/2011/06/using-boost-spirit-21-to-evaluate.html
//--------------------------------------------------------------------------
//
// Copyright (C) 2011, 2012, 2013 Rhys Ulerich
// Copyright (C) 2012, 2013 The PECOS Development Team
// Please see http://pecos.ices.utexas.edu for more information on PECOS.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//
@wcaleb
wcaleb / ocrpdf.sh
Created November 6, 2013 14:41
Take a PDF, OCR it, and add OCR Text as background layer to original PDF to make it searchable
#!/bin/sh
# Take a PDF, OCR it, and add OCR Text as background layer to original PDF to make it searchable.
# Hacked together using tips from these websites:
# http://www.jlaundry.com/2012/ocr-a-scanned-pdf-with-tesseract/
# http://askubuntu.com/questions/27097/how-to-print-a-regular-file-to-pdf-from-command-line
# Dependencies: pdftk, tesseract, imagemagick, enscript, ps2pdf
# Would be nice to use hocr2pdf instead so that the text lines up with the PDF image.
# http://www.exactcode.com/site/open_source/exactimage/hocr2pdf/
@morbusg
morbusg / Unicode math in plain TeX
Created March 6, 2014 12:36
Some Unicode math glyph definitions for use with plain XeTeX using a token list approach instead of family changes.
\Umathcharnumdef\aleph="2135 \Umathcharnumdef\hbar="210F
\Umathcharnumdef\imath="1D6A4 \Umathcharnumdef\jmath="1D6A5
\Umathcharnumdef\ell="2113 \Umathcharnumdef\wp="2118 \Umathcharnumdef\Re="211C
\Umathcharnumdef\Im="2111 \Umathcharnumdef\infty="221E
\Umathcharnumdef\prime="2032 \Umathcharnumdef\emptyset="2205
\Umathcharnumdef\surd="221A \Umathcharnumdef\top="22A4
\Umathcharnumdef\bot="22A5 \Umathcharnumdef\|="2016
\Umathcharnumdef\angle="2220 \Umathcharnumdef\triangle="2206
\Umathcharnumdef\backslash="005C \Umathcharnumdef\forall="2200
\Umathcharnumdef\exists="2203 \Umathcharnumdef\neg="00AC
@shamil
shamil / mount_qcow2.md
Last active July 24, 2024 00:58
How to mount a qcow2 disk image

How to mount a qcow2 disk image

This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.

Step 1 - Enable NBD on the Host

modprobe nbd max_part=8
@Manu343726
Manu343726 / gist:ca0ceb224ea789415387
Created September 19, 2015 18:15
Running ARM docker image with QEMU on x86_64 Arch Linux host
# Install quemu, docker, etc
yaourt -S qemu qemu-user-static binfmt-support
# The quemu-user-static AUR package is outdated and broken. The .deb package they pull is no longer in the ubuntu repository.
# Edit the PKGBUILD and use qemu-user-static_2.4+dfsg-3_amd64.deb (With SHA1 sum "84d83a16c60c82b6c579f2f750b04a3ac26c249b")
# Enable ARM emulation
update-binfmts --enable qemu-arm
@attacus
attacus / riot-matrix-workshop.md
Last active March 13, 2024 00:16
Create your own encrypted chat server with Riot and Matrix

This guide is unmaintained and was created for a specific workshop in 2017. It remains as a legacy reference. Use at your own risk.

Running your own encrypted chat service with Matrix and Riot

Workshop Instructor:

This workshop is distributed under a CC BY-SA 4.0 license.

What are we doing here?

@Brainiarc7
Brainiarc7 / skylake-tuning-linux.md
Last active July 14, 2024 12:33
This gist will show you how to tune your Intel-based Skylake, Kabylake and beyond Integrated Graphics Core for performance and reliability through GuC and HuC firmware usage on Linux.

Tuning Intel Skylake and beyond for optimal performance and feature level support on Linux:

Note that on Skylake, Kabylake (and the now cancelled "Broxton") SKUs, functionality such as power saving, GPU scheduling and HDMI audio have been moved onto binary-only firmware, and as such, the GuC and the HuC blobs must be loaded at run-time to access this functionality.

Enabling GuC and HuC on Skylake and above requires a few extra parameters be passed to the kernel before boot.

Instructions provided for both Fedora and Ubuntu (including Debian):

Note that the firmware for these GPUs is often packaged by your distributor, and as such, you can confirm the firmware blob's availability by running: