The Netflix TechBlog

NOVEMBER 23, 2020

After an instance of gnmi-gateway acquires a lock for a target and forms a connection, it begins to forward data into the local in-memory cache. Although Zookeeper is the included clustering implementation, gnmi-gateway provides a Golang interface that can be used to implement connection coordination with systems other than Zookeeper.

Open Source 188

Open Source Network Transportation Cache 188

Smashing Magazine

JUNE 29, 2021

Without build optimizations (incremental builds, caching, we will get to those soon) this will eventually become unmanageable as well — think about going through all images in a website: resizing, deleting, and/or creating new files over and over again. The cache is invalidated on a time basis. Creating an On-Demand builder.

Cache 139

Cache Website Strategy Traffic 139

Smashing Magazine

JULY 15, 2021

It is based on a caching strategy called “stale while revalidate”, meaning a page can be “stale” with old information until it’s re-generated and the cache is updated. When the non-built pages are requested for the first time, they are built and cached at the edge so they don’t need to be built again.

Cache 129

Cache Website Strategy Servers 129

Smashing Magazine

NOVEMBER 17, 2022

Cache Your Images. A website’s performance can suffer if frequently accessed images are not cached, as many requests will be made to images that have already been loaded in the user’s system. But not only does it cache the original image, but it also stores all the transformations and combinations we make from it.

Media 125

Media Cache Website Mobile 125

SQL Performance

OCTOBER 7, 2020

Its raison d’être is to cache result rows from a plan subtree, then replay those rows on subsequent iterations if any correlated loop parameters are unchanged. Table-valued functions use a table variable, which can be used to cache and replay results in suitable circumstances. Spools are the least costly way to cache partial results.

Servers 106

Servers Cache Azure Performance 106

Brendan Gregg

JULY 2, 2021

cachestat File system cache statistics line charts. In a previous blog post, [An Unbelievable Demo], I talked about how something similar happened many years ago where old tracing tool versions were used without updates. execsnoop New processes (via exec(2)) table. opensnoop Files opened table. ext4slower Slow filesystem I/O table.

Latency 144

Latency Cache Energy Systems 144

Smashing Magazine

JANUARY 16, 2023

See live: Codepen demo 1. The image in this demo is displayed at a fixed width of 280px on all devices. See live: Codepen demo 2. See live: Codepen demo 3. See the final demo. Let’s illustrate the browser’s behavior with an example using our previous code: <img src="image-300.png". srcset=" image-300.png

Media 120

Media Mobile Website Metrics 120

Smashing Magazine

MAY 25, 2021

It’s also trickier to handle cached fonts we already have, not to mention differences in various fallback styles. See [link] by @cramforce for a demo (Chrome Canary/FF Nightly with flags) pic.twitter.com/hEg1HfUJlT — Addy Osmani (@addyosmani) May 22, 2021.

Operating System 145

Operating System Google Website Cache 145

SQL Performance

SEPTEMBER 25, 2019

The general idea is to cache and replay results, saving repeated executions of inner-side operators wherever possible. When a spool is able to replay cached results, this is known as a rewind. You may find it helpful to think of a spool rebind as a cache miss, and a rewind as a cache hit. Lazy Table Spool.

Performance 104

Performance Cache Servers Education 104

Dynatrace

SEPTEMBER 17, 2019

Instead of presenting you with a handful of random screenshots from our demo environment I reached out to Robert, a close friend of mine, who leads a development team with the current task to re-architect and re-platform their multi-tenant SaaS-based eCommerce platform. REDIS for caching. NGINX as an API Gateway. 3 Log Analytics.

AWS 170

AWS Monitoring Ecommerce Lambda 170

Smashing Magazine

FEBRUARY 3, 2022

These numbers are based on first-page load — caching seems very efficient for subsequent page loads. This Codepen demo demonstrates how it can be used to lazyload a number of tweets. Here’s a very basic demo of how we can do this using vanilla JS: See the Pen [Click to load video [forked]]([link] by Michelle Barker.

Social Media 121

Social Media Media Website Airlines 121

Tim Kadlec

OCTOBER 8, 2015

They are able to selectively load things that will appear in the initial viewport and focus heavily on ensuring AMP pages are prerender and cache friendly. To further help achieve the goal of “instant load”, Google is offering to provide caching for these AMP pages through their CDN. You can limit your use of JavaScript.

Cache 75

Cache Google Mobile Open Source 75

Brendan Gregg

FEBRUARY 28, 2023

TCP Extensions for Multipath Operation with Multiple Addresses,” [link] Mar 2020 - [Gregg 20] Brendan Gregg, “Systems Performance: Enterprise and the Cloud, Second Edition,” Addison-Wesley, 2020 - [Hruska 20] Joel Hruska, “Intel Demos PCIe 5.0 Ford, et al., “TCP Clone Disk],” - [link] 2020 - [Moore 20] Samuel K.

Performance 103

Performance Latency Cache Virtualization 103

Jos

APRIL 6, 2018

</ div >. ) ; If you do this, make sure that the images have the right cache response headers so subsequent requests from the browser hit the cache and it doesn’t download the images again. You can see a demo here (check the code source ). . < img src = " [link] " width = " 300 " height = " 300 " />. ) : (. <

Code 147

Code Performance Media Google 147

SQL Performance

MAY 16, 2019

The demo loads 268 rows into a brand new clustered table using INSERT.SELECT with TABLOCK , and reports on the transaction log records generated. For example, changing the TOP clause in the demo script to use a variable results in a fixed cardinality guess of 100 rows, which is below the 251 row minimum: -- Insert rows.

Cache 67

Cache Servers Testing Storage 67

SQL Performance

NOVEMBER 22, 2019

OPTION ( FORCE ORDER ) ; With the session_id predicates now not consumed as parameters, the SelSTVFToIdxOnFly rule is free to convert them to an eager index spool: I don't want to leave you with the impression that tricky rewrites are needed to get an eager index spool over a DMV source – it just makes for an easier demo.

Servers 77

Servers Cache Database Performance 77

CSS - Tricks

SEPTEMBER 2, 2021

HTTP Caching is a Superpower — Hugh Haworth covers how the Cache-Control header is an awfully potent ingredient in web performance. I mis-read the title at first and was waiting to read about HTML caching. I only do it now because Cloudflare handles it. Sorta weird it won’t build on Skypack.

Performance 55

Performance Cache AWS Technology 55

KeyCDN

FEBRUARY 27, 2019

This allows you to better leverage browser caching. To measure this we created a demo page and measured the difference in speed between a page with no pushed assets and the same page with 2 pushed assets. Push is also great for utilizing think time in a more efficient manner. The difference resulted in a 12.5%

Speed 99

Speed Servers Website Efficiency 99

Smashing Magazine

AUGUST 31, 2021

You can check a real-world implementation of this ContextAPI pattern in our demo repository. Libraries like these handle cache locally, so whenever the state is already available they can leverage settings definition to either renew data or use from the local cache. zero-config caching layer. </p> ) }.

Cache 106

Cache Servers Code Best Practices 106

SQL Performance

MAY 29, 2019

The script below is a modification of the demo used in earlier parts in this series. GO. -- Clear the plan cache. The modified demo script is: IF OBJECT_ID ( N'dbo.Test' , N'U' ) IS NOT NULL. GO. -- Clear the plan cache. ( DB_ID ( ) , OBJECT_ID ( N'dbo.Test' , N'U' ) , 1 , -- Index ID.

Cache 64

Cache Testing Servers Code 64

Jos

APRIL 5, 2018

< div className = " placeholder " />. ) &#125; </ div >. ) ; If you do this, make sure that the images have the right cache response headers so subsequent requests from the browser hit the cache and it doesn’t download the images again. . < img src = " [link] " width = " 300 " height = " 300 " />. ) : (. <

Code 130

Code Performance Google Media 130

Adrian Cockcroft

JANUARY 29, 2023

For this demo on an old MacBook (2.7 I think that the structure of the system in terms of functionality distributed across a network of lambda functions, microservices, caches, databases and external services is going to determine the number and position of each peak. The initial loglik value is higher but trends to the same result.

Lambda 98

Lambda Latency Cache C++ 98

SQL Performance

OCTOBER 20, 2022

This was convenient for the demos but repeatable read isolation isn’t common in everyday use. An extra lock or two can be enough to trigger an escalation check when trying to demo edge cases. The test procedure includes extra statements to prevent plan caching in another attempt to make the tests more repeatable.

Testing 91

Testing Servers Cache Engineering 91

KeyCDN

DECEMBER 8, 2022

Many factors affect the speed of your WordPress website; some of them are: Your web host Server-side optimizations (PHP version, compression, caching, etc.) Even many of their demos, packed full of content, load under 800 ms. Configure cache to optimize your website Caching is a complex technology with many layers.

Cache 52

Cache Website Speed Website Performance 52

Smashing Magazine

OCTOBER 8, 2021

Generate your own madlibs in the demo ; Look through the final code on Github ; Get a fully-built version set up in your accounts. We can use 11ty’s new Serverless mode to build them on request using Netlify’s On-Demand Builders to cache each Madlib. Netlify then caches that page on its edge CDN for each additional call.

Serverless 92

Serverless Cache Open Source Code 92

Smashing Magazine

MARCH 7, 2022

If making use of Client Hints and returning different results for the same URL based on these, do remember to include the client hint headers you are altering content based upon, in your Vary header, so any caches are aware of this and won’t serve the cached page for future visits unless they also have the same client hint headers set.

Website 120

Website Media Mobile Network 120

Brendan Gregg

FEBRUARY 28, 2023

TCP Extensions for Multipath Operation with Multiple Addresses,” [link] , Mar 2020 [Gregg 20] Brendan Gregg, “Systems Performance: Enterprise and the Cloud, Second Edition,” Addison-Wesley, 2020 [Hruska 20] Joel Hruska, “Intel Demos PCIe 5.0 Ford, et al., “TCP Clone Disk],” [link] , 2020 [Moore 20] Samuel K.

Performance 52

Performance Latency Cache Virtualization 52

SQL Server According to Bob

JUNE 3, 2016

DEMO – It Just Runs: DBCC CheckDB. Note: You may need to execute the dbcc a second time so buffer cache is hot, eliminating I/O sub-system variants. . ‘It Just Runs Faster’ – Out of the box SQL Server 2016 DBCC provides you better performance, scale while shrinking your maintenance window(s.). or newer release.

Hardware 40

Hardware Servers Cache Software Engineering 40

SQL Performance

SEPTEMBER 6, 2022

There are good reasons you haven’t seen a simple demo of lock escalation taking place at 5000 locks. SET NOCOUNT , XACT_ABORT ON ; -- Prevent plan caching for this procedure. -- See [link]. Much of the documentation is incorrect or at least imprecise about this and I’ve been unable to find a correct description in other writings.

Database 98

Database Testing Storage Servers 98

Percona

JANUARY 4, 2023

Stage – Instrument starting with ‘stage’ provides the execution stage of any query like reading data, sending data, altering table, checking query cache for queries, etc. For getting familiar, check the PMM demo. For example stage/sql/altering table. Wait – Instrument starting with ‘wait’ falls here.

Performance 104

Performance C++ Monitoring Servers 104

Smashing Magazine

APRIL 29, 2021

Chrome DevTools allows you to disable modern image formats ( demo ), like WebP, AVIF or JPEG XL, to test differing fallbacks for them in the Rendering panel: Chrome DevTools allows you to test differing fallbacks for WebP, AVIF or JPEG XL in the Rendering panel. will optimize images dynamically upon request and store them in a local cache.

Media 145

Media Network Metrics Mobile 145

SQL Performance

JUNE 5, 2019

We will restore the backup and enable Query Store, and clear out any old Query Store data so we do not alter any metrics for this demo. Subsequent executions have the same plan (as that’s what was cached) and the same memory grant, but we get a clue it’s not enough because there’s a sort warning. The Sales.Orders table has about 4.6

Servers 41

Servers Cache Database Metrics 41

Brendan Gregg

JULY 2, 2021

cachestat File system cache statistics line charts 7. In a previous blog post, [An Unbelievable Demo], I talked about how something similar happened many years ago where old tracing tool versions were used without updates. execsnoop New processes (via exec(2)) table 2. opensnoop Files opened table 3. and running it on Linux 5.x.

Open Source 40

Open Source Latency Cache Energy 40

Smashing Magazine

JANUARY 21, 2019

Native Client-Side Cache/Data Store. For instance, the returned data for each request can be added into a client-side cache containing all data requested by the user throughout the session. And just by iterating all the values under modulesettings["share-on-social-media"].modules Extensibility And Re-purposing.

Social Media 73

Social Media Database Media Website 73

Percona

MAY 2, 2023

example.net --port=27017 --username=user --authenticationDatabase=admin --db=demo --collection=events --out=/opt/backup/mongodump-2011-10-24 Note : If we don’t specify the DB name or Collection name explicitly in the above “mongodump” syntax then the backup will be taken for the entire database or collections, respectively.

Best Practices 52

Best Practices Database Storage Servers 52

SQL Performance

MARCH 8, 2021

Total elapsed time is 933ms with 6,673ms of CPU time with a warm cache. The features of this demo are: Without an ORDER GROUP hint, it shows how a partial aggregate is not considered a blocking operator, so no “Thread 0” adjustment arises at the repartition streams exchange.

Servers 95

Servers Tuning Architecture Performance 95

CSS Wizardry

SEPTEMBER 6, 2022

Honestly, in this scenario, my advice is almost always: don’t bother trying to retrofit Critical CSS—just hash-n-cache 1 2 the living daylights out of your existing CSS bundles until you replatform and do it differently next time. Let’s look at a demo in which CSS is not the biggest render-blocking resource. How do we automate it?

Media 354

Media Cache Network Website 354