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System Design Cheatsheet

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

Basic Steps

1. 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?

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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

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ghadj

Azure Kinect on Ubuntu 18.04

Notes on Installing Microsoft Azure Kinect Sensor and Body Tracking SDKs on Linux PC and NVIDIA Jetson Xavier NX

06.12.2020

Jump to:

• Installing Sensor SDK on Linux PC
• Installing on Jetson Xavier NX
• Installing Body Tracking SDK
• Updating Firmware for Azure Kinect

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#!/usr/bin/env python
import itertools
import sys
import time
import rospy
import rosbag
import message_filters

"""
Example using a message_filters filter (ApproximateTimeSynchronizer) iterating

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PGP Guide

GPG vs PGP

PGP can refer to two things:

The Pretty Good Privacy software originally written by Phil Zimmermann, and now owned by Symantec. The formats for keys, encrypted messages and message signatures defined by that software. These have now been formalised as the OpenPGP standard. The GPG software is an independent implementation of the OpenPGP standards, so you can use it to exchange encrypted messages with people using other OpenPGP implementations (e.g. Symantec's PGP).

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"""
author: Timothy C. Arlen
date: 28 Feb 2018

reviced: George Hadjiantonis
date: 23 Dec 2020

Calculate Mean Average Precision (mAP) for a set of bounding boxes corresponding to specific
image Ids. Usage: