Kien Nguyen-Tuan ntk148v

Overview

Some notes about:

Explaining why current day Linux memory swap thrashing still happens (as of 2016).
Mitigating "stop the world" type thrashing issues on a Linux workstation when it's under high memory pressure and where responsiveness is more important than process completion.
Prioritizing and limiting memory use.
Older ulimit versus newer CGroup options.

These notes assume some basic background knowledge about memory management, ulimits and cgroups.

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?

Golang Workers / Job Queue

A running example of the code from:

This gist creates a working example from blog post, and a alternate example using simple worker pool.

TLDR: if you want simple and controlled concurrency use a worker pool.

EDIT from 2019: Hi folks. I wrote this gist for myself and some friends, and it seems like it's gotten posted somewhere that's generated some (ahem, heated) discussion. ~~The whitespace was correct when it was posted, and since then GitHub changed how it formats <pre> tags. Look at the raw text if you care about this. I'm sure someone could tell me how to fix it, but~~ (thank you @anzdaddy for suggesting a formatting workaround) honestly this is a random throwaway gist from 2015, and someone more knowledgable about this comparison should just write a proper blog post about it. If you comment here I'll hopefully see it and stick a link to it up here. Cheers. @oconnor663

Here's the canonical TOML example from the TOML README, and a YAML version of the same.

title = "TOML Example"

IRC Reference

by xero updated 10.29.24

	"""
	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

	#!/bin/bash

	yum install wget
	wget http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
	rpm -ivh epel-release-6-8.noarch.rpm
	yum install byobu
	byobu-enable

	# Default Key Bindings
	# F2 -> Create new window

	# Copy and self modified from ys.zsh-theme, the one of default themes in master repository
	# Clean, simple, compatible and meaningful.
	# Tested on Linux, Unix and Windows under ANSI colors.
	# It is recommended to use with a dark background and the font Inconsolata.
	# Colors: black, red, green, yellow, *blue, magenta, cyan, and white.
	# http://xiaofan.at
	# 2 Jul 2015 - Xiaofan

	# Machine name.
	function box_name {

	#!/bin/bash

	set -ex

	#
	# The network interface that will be used by OpenStack services.
	# The IP address of this interface will be used in the service
	# catalog for admin and internal endpoints.
	#
	net_interface=eth0

	#!/bin/bash
	# Sometimes you need to move your existing git repository
	# to a new remote repository (/new remote origin).
	# Here are a simple and quick steps that does exactly this.
	#
	# Let's assume we call "old repo" the repository you wish
	# to move, and "new repo" the one you wish to move to.
	#
	### Step 1. Make sure you have a local copy of all "old repo"
	### branches and tags.