Prashant Shubham lucifercr07

Performance Engineering, Hardware and cache awareness with algorithm and data structures

Parallel Computing Course - Stanford CS149, Fall 2023
Performance-Aware Programming Series by Casey Muratori
Algorithms for Modern Hardware
Computer Systems: A Programmer's Perspective, 3/E - by Randal E. Bryant and David R. O'Hallaron, Carnegie Mellon University
Performance Engineering Of Software Systems - am MITOCW course
Parallel Programming 2020 by NHR@FAU
Cpu Caches and Why You Care - by Scott Meyers

Basics

B-trees and CPU Caches

Falsehoods programmers believe about time

This is a compiled list of falsehoods programmers tend to believe about working with time.

Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.

Falsehoods

There are always 24 hours in a day.
February is always 28 days long.
Any 24-hour period will always begin and end in the same day (or week, or month).

What do Etcd, Consul, and Zookeeper do?
- Service Registration:
  - Host, port number, and sometimes authentication credentials, protocols, versions numbers, and/or environment details.
- Service Discovery:
  - Ability for client application to query the central registry to learn of service location.
- Consistent and durable general-purpose K/V store across distributed system.
  - Some solutions support this better than others.
  - Based on Paxos or some derivative (i.e. Raft) algorithm to quickly converge to a consistent state.
Centralized locking can be based on this K/V store.

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

progrium/bashstyle

Bash is the JavaScript of systems programming. Although in some cases it's better to use a systems language like C or Go, Bash is an ideal systems language for smaller POSIX-oriented or command line tasks. Here's three quick reasons why:

It's everywhere. Like JavaScript for the web, Bash is already there ready for systems programming.
It's neutral. Unlike Ruby, Python, JavaScript, or PHP, Bash offends equally across all communities. ;)
It's made to be glue. Write complex parts in C or Go (or whatever!), and glue them together with Bash.

This document is how I write Bash and how I'd like collaborators to write Bash with me in my open source projects. It's based on a lot of experience and time collecting best practices. Most of them come from these two articles, but here integrated, slightly modified, and focusing on the most bang for buck items. Plus some ne

	"""
	Play with saving .

	Closest:
	https://github.com/tensorflow/tensorflow/issues/616#issuecomment-205620223
	"""
	import numpy as np

	import tensorflow as tf
	from tensorflow.python.platform import gfile

	#!/usr/bin/env bash

	sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
	sudo apt update

	sudo update-alternatives --remove-all gcc
	sudo update-alternatives --remove-all g++
	sudo apt-get install -y gcc-4.8 g++-4.8 gcc-4.9 g++-4.9 gcc-5 g++-5 gcc-6 g++-6 gcc-7 g++-7

	sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 10

	Step by step how to pull a private DockerHub hosted image in a Kubernetes YML.

	export DOCKER_REGISTRY_SERVER=https://index.docker.io/v1/
	export DOCKER_USER=Type your dockerhub username, same as when you `docker login`
	export DOCKER_EMAIL=Type your dockerhub email, same as when you `docker login`
	export DOCKER_PASSWORD=Type your dockerhub pw, same as when you `docker login`

	kubectl create secret docker-registry myregistrykey \
	--docker-server=$DOCKER_REGISTRY_SERVER \
	--docker-username=$DOCKER_USER \

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <dlfcn.h>

	int main(int argc, char** argv)
	{
	void *handle;
	void (func_print_name)(const char);