Logmos

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

Dear C++ library writer,

If your library forces me to use new all over, I will hate you.
If your library has types with bogus values, I will hate you.
If the documentation for your library gets the terminology of its own domain wrong, I will hate you.
If I say "My God, it's full of stars!" when I see the function signatures in your library, I will hate you.

Effective Modern CMake

Getting Started

For a brief user-level introduction to CMake, watch C++ Weekly, Episode 78, Intro to CMake by Jason Turner. LLVM’s CMake Primer provides a good high-level introduction to the CMake syntax. Go read it now.

After that, watch Mathieu Ropert’s CppCon 2017 talk Using Modern CMake Patterns to Enforce a Good Modular Design (slides). It provides a thorough explanation of what modern CMake is and why it is so much better than “old school” CMake. The modular design ideas in this talk are based on the book [Large-Scale C++ Software Design](https://www.amazon.de/Large-Scale-Soft

C++ links: Coroutines

https://github.com/MattPD/cpplinks / C++ Standard / C++20 / Coroutines

(draft; work in progress)

#coroutines (C++ Slack): https://cpplang.slack.com/archives/C5JS5JXT5

	/*!
	* \file
	* \brief
	*/


	#include <gtk/gtk.h>


	/*!

	/*!
	* If you want to validate the text that a user enters into a GtkEntry widget
	* you can attach to the "insert_text" signal of the entry, and modify the text
	* within the callback function.\n
	* The example below forces all characters to uppercase, and limits the range of
	* characters to A-Z.\n
	* Note that the entry is cast to an object of type GtkEditable, from which
	* GtkEntry is derived.
	*/

	# INSTALL INSTRUCTIONS: save as ~/.gdbinit
	#
	# DESCRIPTION: A user-friendly gdb configuration file.
	#
	# REVISION : 7.3 (16/04/2010)
	#
	# CONTRIBUTORS: mammon_, elaine, pusillus, mong, zhang le, l0kit,
	# truthix the cyberpunk, fG!, gln
	#
	# FEEDBACK: https://www.reverse-engineering.net

	//compile with -Ofast -march=native -funroll-loops

	#include <stdio.h>
	typedef unsigned short uint16_t;

	template <int n, int m>
	struct queens {
	static void f(uint16_t col, uint16_t left, uint16_t right, size_t& count) {
	uint16_t mask = ~(col \| left \| right);
	for (int i = 0; i < n; ++i, mask >>= 1) {

	yum -y install texlive texlive-latex texlive-xetex
	yum -y install texlive-collection-latex
	yum -y install texlive-collection-latexrecommended
	yum -y install texlive-xetex-def
	yum -y install texlive-collection-xetex
	Only if needed:
	yum -y install texlive-collection-latexextra

	# Change BASE_DIR accordingly.
	BASE_DIR=/Users/ray_zhang/home/tensorflow/bazel-bin
	INC=-I$(BASE_DIR)/tensorflow/include -I$(BASE_DIR)/tensorflow -I$(BASE_DIR)/tensorflow/include/src/
	LIB=-L$(BASE_DIR)/tensorflow -rpath $(BASE_DIR)/tensorflow -ltensorflow_cc -ltensorflow_framework
	FLAGS=-std=c++14

	main: deserialize.cpp
	g++ $(FLAGS) $(INC) $(LIB) -o deserialize $^

Logmos

Latency numbers every programmer should know

Effective Modern CMake

Getting Started

C++ links: Coroutines

Contents