Brendan Gregg

FEBRUARY 28, 2023

My personal opinion is that I don't see a widespread need for more capacity given horizontal scaling and servers that can already exceed 1 Tbyte of DRAM; bandwidth is also helpful, but I'd be concerned about the increased latency for adding a hop to more memory. Ford, et al., “TCP Clone Disk],” - [link] 2020 - [Moore 20] Samuel K.

Performance 110

Performance Latency Cache Virtualization 110

KeyCDN

DECEMBER 8, 2022

A WordPress website comprises many parts, including web servers and their settings, different plugins, and themes. Many factors affect the speed of your WordPress website; some of them are: Your web host Server-side optimizations (PHP version, compression, caching, etc.) It is challenging to figure out why WordPress is slow.

Cache 52

Cache Website Speed Website Performance 52

Smashing Magazine

JANUARY 11, 2021

Build Optimizations JavaScript modules, module/nomodule pattern, tree-shaking, code-splitting, scope-hoisting, Webpack, differential serving, web worker, WebAssembly, JavaScript bundles, React, SPA, partial hydration, import on interaction, 3rd-parties, cache. It used to provide an insight into how quickly the server outputs any data.

Performance 145

Performance Cache Media Metrics 145

Brendan Gregg

JULY 2, 2021

cachestat File system cache statistics line charts. The architecture is: While the bpftrace binary is installed on all the target systems, the bpftrace tools (text files) live on a web server and are pushed out when needed. execsnoop New processes (via exec(2)) table. opensnoop Files opened table. ext4slower Slow filesystem I/O table.

Latency 145

Latency Cache Energy Systems 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

SQL Performance

MAY 16, 2019

Without this guarantee, SQL Server might add index rows that are not sorted correctly, which would not be good. For INSERT.SELECT , SQL Server makes its own determination whether to ensure rows are presented to the Clustered Index Insert operator in key order or not. DMLRequestSort Conditions.

Cache 67

Cache Servers Testing Storage 67

SQL Performance

JUNE 5, 2019

One of the more perplexing problems to troubleshoot in SQL Server can be those related to memory grants. SQL Server’s optimizer estimates how much memory is needed, and the query must obtain the memory grant in order to start executing. sort, hash). The Sales.Orders table has about 4.6 million rows. USE [ master ] ; GO.

Servers 41

Servers Cache Database Metrics 41

SQL Performance

OCTOBER 20, 2022

This was convenient for the demos but repeatable read isolation isn’t common in everyday use. When SQL Server reads data under locking read committed isolation (the default for non-cloud offerings) and chooses row-level locking granularity, it normally only locks one row at a time. SQL Server solves this problem using lock classes.

Testing 91

Testing Servers Cache Engineering 91

Smashing Magazine

JANUARY 6, 2020

Is it worth exploring tree-shaking, scope hoisting, code-splitting, and all the fancy loading patterns with intersection observer, server push, clients hints, HTTP/2, service workers and — oh my — edge workers? It used to provide an insight into how quickly the server outputs any data. What does it mean?

Performance 145

Performance Cache Network Metrics 145

SQL Performance

NOVEMBER 22, 2019

SQL Server does not support parallel inserts to a b-tree index. As noted in the introduction, SQL Server does not support parallel inserts to a b-tree index, so the operators below the eager index spool run on a single thread. Undocumented trace flag 9260 can be used to generate a Sort operator before the index spool to avoid this.

Servers 77

Servers Cache Database Performance 77

Smashing Magazine

MAY 25, 2021

Though there are other advantages and possibilities to using the JavaScript API for this as explained by Zach Leatherman in this fantastic talk from way back in 2019 — you can reduce reflows and handle data-server mode and prefers-reduced-motion though that (note however that both have since been exposed to CSS since that talk).

Operating System 144

Operating System Google Website Cache 144

Brendan Gregg

FEBRUARY 28, 2023

My personal opinion is that I don't see a widespread need for more capacity given horizontal scaling and servers that can already exceed 1 Tbyte of DRAM; bandwidth is also helpful, but I'd be concerned about the increased latency for adding a hop to more memory. Ford, et al., “TCP Clone Disk],” [link] , 2020 [Moore 20] Samuel K.

Performance 52

Performance Latency Cache Virtualization 52

SQL Performance

MAY 29, 2019

It can be activated from SQL Server 2008 to 2014 inclusive using documented trace flag 610. From SQL Server 2016 onward, FastLoadContext is enabled by default ; the trace flag is not required. For more background, see the Data Performance Loading Guide and the Tiger Team notes on the behaviour changes for SQL Server 2016.

Cache 64

Cache Testing Servers Code 64

KeyCDN

FEBRUARY 27, 2019

HTTP Preload and HTTP/2’s feature “Server Push” are both methods that can be used to improve the loading efficiency of your web application. Traditionally, the client requesting resources from the server initially receives the HTML file and parses it to determine which assets it needs to request next.

Speed 99

Speed Servers Website Efficiency 99

Percona

MAY 2, 2023

During the logical backups, using client API, the data gets read from the server and returned back to the same API, which will be serialized and written into respective “ bson”, “ json” or “ csv” backup files on disk depending upon the type of backup utilities used. mongodump --host=mongodb1.example.net

Best Practices 52

Best Practices Database Storage Servers 52

Tim Kadlec

OCTOBER 8, 2015

They had a timer visible to both the customer and the server. One of the most absurd happened when a customer informed the server that part of their order was missing. The server had the customer first drive forward a few feet, and then back up to the window. You can build your sites to be prerender and cache friendly.

Cache 75

Cache Google Mobile Open Source 75

Smashing Magazine

JANUARY 7, 2019

Is it worth exploring tree-shaking, scope hoisting, code-splitting, and all the fancy loading patterns with intersection observer, server push, clients hints, HTTP/2, service workers and — oh my — edge workers? Long FMP usually indicates JavaScript blocking the main thread, but could be related to back-end/server issues as well.

Performance 104

Performance Cache Metrics Network 104

Abhishek Tiwari

NOVEMBER 3, 2018

If you put your whole website on CDN, technically you don’t need a large number of server infrastructure and CMS licenses. They often get blindsided by vendor’s pitch and end-up making decision based on some fancy demos (see my post from 2014 on Adobe AEM ). i.e. everything you need to render your site. Decoupled CMS vs. headless CMS.

Systems 63

Systems Cache Website Network 63

CSS Wizardry

MAY 19, 2020

It’s widely accepted that self-hosted fonts are the fastest option: same origin means reduced network negotiation, predictable URLs mean we can preload , self-hosted means we can set our own cache-control. The median TTFB (including request queueing, DNS, TCP, TLS, and server time) for the Google Fonts CSS file across all tests was 1406ms.

Google 364

Google Media Latency Metrics 364

SQL Performance

SEPTEMBER 6, 2022

There are good reasons you haven’t seen a simple demo of lock escalation taking place at 5000 locks. I happen to be using SQL Server 2019 CU16 but the details I’ll describe haven’t materially changed since partition level lock escalation was added to SQL Server 2008. Testing environment. GOTO Start. OPEN SYMMETRIC KEY Banana.

Database 98

Database Storage Testing Servers 98

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 127

AWS Monitoring Ecommerce Lambda 127

SQL Server According to Bob

JUNE 3, 2016

Ryan Stonecipher – Principle SQL Server Software Engineer. Bob Dorr – Principal SQL Server Escalation Engineer. DEMO – It Just Runs: DBCC CheckDB. Use SQL Server Management Studio (SSMS) or your favorite query editor to connect to a SQL Server 2012 or 2014 instance. SQL Server. begin tran.

Hardware 40

Hardware Cache Servers Software Engineering 40

SQL Performance

MARCH 8, 2021

SQL Server 2014 SP2 and later produce runtime (“actual”) execution plans that can include elapsed time and CPU usage for each execution plan operator (see KB3170113 and this blog post by Pedro Lopes). SQL Server makes some timing adjustments in parallel plans to promote consistency, but they are not perfectly implemented. TheYear , CA.

Servers 95

Servers Tuning Architecture Performance 95

Brendan Gregg

JULY 2, 2021

cachestat File system cache statistics line charts 7. The architecture is: While the bpftrace binary is installed on all the target systems, the bpftrace tools (text files) live on a web server and are pushed out when needed. 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

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. Performance schemas are a great help while troubleshooting the behavior of your MySQL server. Conclusion.

Performance 98

Performance C++ Monitoring Servers 98

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 79

Serverless Cache Open Source Code 79

Smashing Magazine

MARCH 7, 2022

In the past, Chrome used to perform changes to the website by proxying requests via their servers (similar to how Opera Mini works), but doing that is usually frowned upon these days. The BrowserLeaks demo above actually cheats, by loading that data in an iframe rather than in the main document, to get around this.

Website 105

Website Media Mobile Network 105

Smashing Magazine

JANUARY 21, 2019

An API is the communication channel for an application to load data from the server. This relationship can be expressed through an associative array (an array of key => property) on the server-side, in which each module states its name as the key attribute and its inner modules under the property modules. Large preview ).

Social Media 65

Social Media Database Media Website 65

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

Smashing Magazine

JULY 15, 2021

Normally, when you deploy a website that isn’t server-side or client-side rendered, it has to be compiled and built for the browser to natively load it (so, for example, your JSX is transpiled to vanilla JavaScript, your SCSS compiled to vanilla CSS, your templates into HTML). That’s where you’re wrong! You’re about to understand them now.

Cache 126

Cache Website Strategy Servers 126

Smashing Magazine

AUGUST 31, 2021

This file is rendered on the server and is not re-rendered on the client. You can check a real-world implementation of this ContextAPI pattern in our demo repository. what to do while waiting for the server response. how to handle when data is not available (server error, or no data). zero-config caching layer.

Cache 104

Cache Servers Best Practices Code 104