Oleg Yablokov olegyablokov

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

Project Title

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Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

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

	#include <future>
	#include <iostream>

	using namespace std;

	future<int> async_add(int a, int b)
	{
	auto fut = std::async([=]() {
	int c = a + b;
	return c;

	--- PSQL queries which also duplicated from https://github.com/anvk/AwesomePSQLList/blob/master/README.md
	--- some of them taken from https://www.slideshare.net/alexeylesovsky/deep-dive-into-postgresql-statistics-54594192

	-- I'm not an expert in PSQL. Just a developer who is trying to accumulate useful stat queries which could potentially explain problems in your Postgres DB.

	------------
	-- Basics --
	------------

	-- Get indexes of tables

	SELECT ddlsql \|\| regexp_replace(name, E'^_',E'','g') As ddlsql FROM (SELECT 'ALTER TABLE ' \|\| quote_ident(t.table_schema) \|\| '.'
	\|\| quote_ident(t.table_name) \|\| ' RENAME TO ' As ddlsql, quote_ident(lower(regexp_replace(t.table_name, E'([A-Z])', E'\_\\1','g'))) \|\| ';' as name
	FROM information_schema.tables As t
	WHERE t.table_schema NOT IN('information_schema', 'pg_catalog')
	AND t.table_name <> lower(t.table_name)
	ORDER BY t.table_schema, t.table_name) x;