Brendan Gregg

SEPTEMBER 25, 2021

These strange questions came to the fore back in 2014 when Netflix was switching services from CentOS Linux to Ubuntu, and I helped debug several weird performance issues including one I'll describe here. A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. How would you time time?

Speed 52

Speed Java AWS Virtualization 52

Brendan Gregg

SEPTEMBER 25, 2021

These strange questions came to the fore back in 2014 when Netflix was switching services from CentOS Linux to Ubuntu, and I helped debug several weird performance issues including one I'll describe here. A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. How would you _time_ time?

Speed 40

Speed Java AWS Virtualization 40

SQL Performance

MAY 16, 2019

Both of the following tests must pass for SQL Server to choose to set DMLRequestSort to true when inserting to an empty clustered index with table locking specified: An estimate of more than 250 rows at the input side of the Clustered Index Insert operator; and. Test ; END ; GO. DMLRequestSort Conditions. DROP TABLE dbo. DEFAULT ''. )

Cache 67

Cache Servers Testing Storage 67

SQL Performance

JUNE 21, 2019

This article will expand on my previous article and point out how these apply to SQL Server , Azure SQL Database , and Azure SQL Managed Instance. When looking at backups, I check for recovery model and the current history of backups for each database. Azure SQL Database and Azure Managed Instance have managed backups.

Servers 49

Servers Azure Hardware Database 49

SQL Server According to Bob

JUNE 3, 2016

In the Sep 2014 the SQL Server CSS and Development teams performed a deep dive focused on scalability and performance when running on current and new hardware configurations. The SQL Server Development team tasked several individuals with scalability improvements and real world testing patterns. Try SQL Server 2016 Today.

Hardware 40

Hardware Software Engineering Transportation Scalability 40

Percona

JUNE 4, 2023

Before we dive into the differences between MariaDB and MySQL, we will provide a thorough examination of each relational database management system (RDBMS). While originally designed to be a drop-in replacement for MySQL, it evolved into its own distinct database management system and is now maintained and supported by the MariaDB Foundation.

Open Source 52

Open Source Servers Storage Scalability 52

SQL Server According to Bob

SEPTEMBER 26, 2016

As we moved towards SQL Server 2014, the pace of hardware accelerated. Our design for SQL Server 2012 and SQL Server 2014 is still proven and meets the demands for many of our customers. The yellow line represents throughput results for SQL Server 2014 with a single sync replica. Direct seeding of new database replicas.

Availability 40

Availability Servers Hardware Benchmarking 40

SQL Server According to Bob

JUNE 3, 2016

The following chart shows the same 1TB database testing. Use SQL Server Management Studio (SSMS) or your favorite query editor to connect to a SQL Server 2012 or 2014 instance. SQL Server 2014. MultiObjectScanner = Older design. CheckScanner = New design. Paste the script below in a new query window. or newer release.

Hardware 40

Hardware Cache Servers Software Engineering 40

Alex Russell

JUNE 22, 2022

Defenders of Apple's monopoly offer hard-to-test claims, but many boil down to the idea that Apple's product is inferior by necessity. This will, in turn, cause developers to skimp on testing for Safari, making it inevitable that browsers based on WebKit and other minority engines cannot compete. Or so the theory goes.

Engineering 110

Engineering Traffic Government Google 110

Alex Russell

APRIL 29, 2021

Thanks to the Web Platform Tests project and wpt.fyi , we have the makings of an answer for the first: Tests that fail only in a given browser. wpt.fyi 's new Compat 2021 dashboard narrows this full range of tests to a subset chosen to represent the most painful compatibility bugs : Stable-channel Compat 2021 results over time.

Media 145

Media Games Education Engineering 145

Scalegrid

AUGUST 15, 2019

In 2014, we discussed 4 of the top MongoDB GUIs: MongoVue, MongoHub, RockMongo, and Robo 3T (formerly Robomongo), and again in 2016: MongoDB Compass, Robo 3T, Studio 3T, and MongoBooster. Whether you're exploring your local #MongoDB database or working with shards and replica sets, @Studio3T allows you to do all of it. Click To Tweet.

Database 40

Database Servers Monitoring Availability 40

Brendan Gregg

NOVEMBER 28, 2017

It's all a bit confusing, and I wrote about this in 2014: [Xen Modes]. When I joined Netflix in 2014, we had begun transitioning from PV to HVM (PVHVM). But not all workloads: some are network bound (proxies) and storage bound (databases). ## 5. This recommendation quickly became out of date. The first was c3. Impressive!

Virtualization 40

Virtualization AWS Hardware Storage 40

Alex Russell

MARCH 6, 2021

Devices and networks have evolved too: Alex Russell @slightlylate An update on mobile CPUs and the Performance Inequality Gap: Mid-tier Android devices (~$300) now get the single-core performance of a 2014 iPhone and the multi-core perf of a 2015 iPhone. mid-priced Androids were slightly faster than 2014's iPhone 6.

Performance 124

Performance Network Cache Metrics 124

SQL Performance

MAY 29, 2019

It can be activated from SQL Server 2008 to 2014 inclusive using documented trace flag 610. As a consequence, a suitable insert with TABLOCK may still qualify for minimal logging via FastLoadContext if it fails the detailed RowsetBulk tests. Test ; END ; GO. CHECKPOINT ; GO. -- Main test. DROP TABLE dbo. CREATE TABLE dbo.

Cache 64

Cache Testing Servers Code 64

SQL Performance

APRIL 23, 2019

SQL Server 2014 added the ability to perform parallel batch-mode grouped aggregation within a single Hash Match Aggregate operator. You should not use it on anything except a personal test system. This is the basic test setup: USE Sandpit ; GO. Test ( c2 ) ; GO. Test AS T GROUP BY. DROP TABLE IF EXISTS dbo.

Servers 67

Servers Testing Metrics Storage 67

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). The following examples use the public Stack Overflow 2013 database ( download details ), with a single index added: CREATE INDEX PP ON dbo.

Servers 95

Servers Tuning Architecture Processing 95

The Netflix TechBlog

JANUARY 10, 2024

From Reloaded to Cosmos Reloaded Starting in 2014, we developed and operated the video processing pipeline on our third-generation platform Reloaded. This release candidate then went through exhaustive testing which attempted to cover as large a surface area as possible. This testing stage took about two weeks. 264, AV1, etc.).

Processing 229

Processing Media Latency Innovation 229

Highly Scalable

MARCH 10, 2015

A/B testing and panel surveys are used in such cases to get additional data points that improve the precision of the model. A recommender system with multiple objectives was suggested in [JW10] and then developed and tested in practice at a large scale by LinkedIn [RP12]. Simchi-Levi, 2014. Problem 1 : Response Modeling.

Retail 152

Retail C++ Analytics Metrics 152

O'Reilly

JULY 25, 2023

To provide some coherence to the music, I decided to use Taylor Swift songs since her discography covers the time span of most papers that I typically read: Her main albums were released in 2006, 2008, 2010, 2012, 2014, 2017, 2019, 2020, and 2022. This choice also inspired me to call my project Swift Papers.

Programming 98

Programming Code Design Benchmarking 98