Latency and throughput

 what I learned:


Latency and throughput are the 2 most important things to consider when measuring a performance of a system.



1) Latency is basically how long it takes for data to get from point A to point B. This could be anything from fetching data from client to server, reading from RAM, reading from SSD, etc. An API call will obviously have higher latency than reading from SSD and reading from SSD will have higher latency than reading from RAM. When designing a system, it's important to think about the latency of your system. For example, if you have a streaming service like netflix, it's important not to have users constantly see "video buffering" because of latency issues so maybe you need to have servers closer to the clients.


2) Throughput it how much work a machine can perform in a given time. A good way to think about it is that throughput is the size of the diameter of the pipe in the picture above. A real world way to think about it is if you have a lot of clients, throughput is how many clients can the server handle requests for in a given amount of time. You can see that throughput can easily become the 'bottleneck' of your system. A good way to improve throughput is perhaps to increase the number of servers.

Comments

Post a Comment

Popular posts from this blog

Lifecycle of React components

 What I learned today : how to use lifecycle of React components without using class When we talk about the lifecycle of react components, we are talking about Mounting Unmounting Updating The reason it is important to understand is because there are side effects that we need to perform during the lifecycle of a component such as api calls, initialization, and cleanups(release resources like event listeners). 1) mounting - when a component is first is injected into the DOM and rendered for the first time 2) unmounting - when a component is removed from the DOM and is no longer being rendered 3) Updating - when a state inside the component changes or prop is passed into the component The useEffect hook is useful and can run in all of these different lifecycles. import { useEffect } from 'react' The basic syntax takes in a callback function: useEffect (() => {   //code }) this will run everytime a component mounts or updates. In order to run only when the component mounts:
Read more

Styled Components

Image
 What I learned today: Styled-components provide several advantages, particularly in component-based web development To get started install the 'styled-components' package. Then you can optionally create a directory to contain all of your styled components Then you can define it like this for example: const Wrapper = styled . div `   position : relative ;   .logout-btn {     display : flex ;     align-items : center ;     justify-content : center ;     gap : 0 0.5rem ;   }   .img {     width : 25px ;     height : 25px ;     border-radius : 50% ;   } And then you can apply your CSS by simply wrapping it around your React components.   return (     < Wrapper >         < button type = 'button' className = "btn logout-btn" />       </ Wrapper >   ) Some advantages of styled components: Scoped Styling : Styles are scoped to specific components, ensuring they don't leak into other parts of the application. This prevents style conflict
Read more

e-commerce website built with React.nodejs

Image
            This is a responsive e-commerce website I built with React and Nodejs. Users can browse, add goods to the cart, and checkout with a valid credit card number Live Demo    (you can use this test credit card #: 4242 4242 4242 4242)            Repo frontend           Repo backend                 First things first - creating a landing page        I wanted to spend some time making the marketing page look good because I felt like an ecommerce site should look as attractive as possible. Styling was done with vanilla css. I made sure this site was responsive using media queries.       Creating the backend   I didn't think I would need my own backend for this project but I couldn't find an API that fit the type of products I wanted to "sell". So I created my own. Two notable features I used are: JWT authentication and Stripe (to process the payment by customers). The backend is set up  so that users can login or checkout as guests and it will handle the payments
Read more