Erik Zenker erikzenker

DIY Solar Power System

In this document I want to describe my progress building an own solar load controller.

Problem

There exist a lot of solar load controller which you can use to build a simple solar power system. Usualy, these load controller do not provide open and well documented interfaces to access data such as:

Solar panel voltage/current
Battery voltage
Consumer current

Clang Compile Time Cookbook

In this cookbook I will discuss several techniques to reduce the compile time of the llvm frontend clang. I will put the focus on heavy template and constexpr code.

Clang Tools Pipeline

First it is important to understand the internals of clang. Clang is a collection of tools which are pipelined.

Preprocessor

Performs the actions of the C preprocessor
The command line option -E stops clang after this stage

Boost Hana Cookbook

All receipies use the following include and namespace:

#include <boost/hana.hpp>
namespace bh = boost::hana;

Best Practice

use make_basic_tuple over make_tuple since a basic_tuple is more compile time efficient.

This is a manual for OSX like touchpad gestures on arch linux for the awesome window manager. It describes how to trigger awesome actions on swiping with three fingers on the touchpad.

Install libinput dependencies pacaur -S sf86-input-libinput libinput-gestures
Add current user to input group sudo gpasswd -a $USER input

	// API Documentation was created based on the presentation of Herb Sutter on CppCon 2018:
	// https://www.youtube.com/watch?v=80BZxujhY38
	// and the original propsal:
	// http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2018/p0707r3.pdf
	// and test from the implementation repo
	// https://github.com/asutton/clang/tree/095a810d0514ccc9b3ea66c546a2adc7384449ca/test/CXX/meta

	// Create a meta class
	template <typename T>
	constexpr void meta_class(T source){

	# Heavily cribbed from the equivalent NixOS login script.
	# This should work better with multi-user nix setups.

	export NIXPKGS_CONFIG="/etc/nix/nixpkgs-config.nix"
	export NIX_OTHER_STORES="/run/nix/remote-stores/*/nix"
	export NIX_USER_PROFILE_DIR="/nix/var/nix/profiles/per-user/$USER"
	export NIX_PROFILES="/nix/var/nix/profiles/default $HOME/.nix-profile"
	export NIX_PATH="/nix/var/nix/profiles/per-user/root/channels"
	export PATH="$HOME/.nix-profile/bin:$HOME/.nix-profile/sbin:/nix/var/nix/profiles/default/bin:/nix/var/nix/profiles/default/sbin:$PATH"

	#! /usr/bin/env sh

	# Init paths
	cd ~
	mkdir -p projects
	cd projects

	# Load modules
	module load git
	module load intel/2016.2.181

	#!/usr/bin/env sh

	# Create paths
	cd ~
	mkdir projects
	cd projects

	# Load modules
	module purge
	module load gcc/4.9.2

	#! /usr/bin/env sh
	# Intel tutorial: https://software.intel.com/en-us/articles/building-a-native-application-for-intel-xeon-phi-coprocessors

	# Load modules
	module load intel/2016.2.181
	module load cmake/3.3.1
	module load boost/1.60.0-intel2016.2.181-intelmpi5.1-knc
	module load gcc/4.9.3 # gives hints to icc where to find libstdc++

	# Load some magic numbers

	#!/usr/bin/env sh

	git clone https://github.com/psychocoderHPC/picongpu-alpaka.git
	cd picongpu-alpaka
	git checkout topic-cupla
	cd ..

	git clone https://github.com/psychocoderHPC/alpaka.git
	cd alpaka
	git checkout topic-picongpu-alpaka