The Netflix TechBlog

MARCH 2, 2021

We use A/B tests to introduce new product features, such as our daily Top 10 row that help our members discover their next favorite show. David Cameron (Studio Production) [David C.] My academic credentials definitely helped on the technical side. Learning through data is in Netflix’s DNA.

Analytics 207

Analytics C++ Innovation Engineering 207

SQL Performance

MARCH 10, 2021

I’ll do my testing in tempdb, enabling time statistics: SET NOCOUNT ON ; USE tempdb ; SET STATISTICS TIME ON ; Earlier ideas. BatchMe ( col1 INT NOT NULL , INDEX idx_cs CLUSTERED COLUMNSTORE ) ; And here’s the code with the definition of the dbo.GetNumsAlanCharlieItzikBatch function: CREATE OR ALTER FUNCTION dbo.

C++ 134

C++ Testing Code Servers 134

SQL Performance

DECEMBER 9, 2020

In a comment to my article, Marcos Kirchner mentioned that he tested my solution with varying table value constructor cardinalities, and got different execution times for the different cardinalities. Testing different base table cardinalities is just one dimension to try. Let’s proceed to performance testing.

C++ 114

C++ Servers Testing Processing 114

The Netflix TechBlog

SEPTEMBER 10, 2019

Toby Mao , Sri Sri Perangur , Colin McFarland Another day, another custom script to analyze an A/B test. You can look at ABlaze (our centralized A/B testing platform) and take a quick look at how it’s performing. At any point a Netflix user is in many different A/B tests orchestrated through ABlaze. Not at Netflix.

Metrics 215

Metrics Architecture Infrastructure Innovation 215

SQL Performance

APRIL 13, 2022

Note the definition of the primary key constraint based on the composite key (grp, ord), which results in a clustered index based on the same key. To test the performance of your solution, you’ll need to populate the table with larger volumes of sample data. L0 AS ( SELECT 1 AS c. uniquevalues AS INT = 5 ; ALTER TABLE dbo.

C++ 136

C++ Strategy Testing Servers 136

SQL Performance

JULY 13, 2022

To test the performance of the solutions, you’ll need a larger set of sample data. L0 AS ( SELECT 1 AS c. GetNums ( 1 , @numrows ) AS N ; Feel free, of course, to test the performance of the solutions with different data loading parameters if you’d like.

C++ 112

C++ Code Azure Database 112

Dynatrace

NOVEMBER 8, 2021

G2 Research includes a clear definition of APM in its Grid Report for Application Performance Monitoring for Spring 2021. To deliver flawless user experiences, an APM solution should be able to delve into real-user monitoring and synthetic testing, with the ability to replay session-level details. User experience diagnostics.

Artificial Intelligence 238

Artificial Intelligence Monitoring Infrastructure Cloud 238

Percona

JUNE 7, 2023

Triggers on Data Definition Language (DDL) events are a powerful feature of PostgreSQL that allows you to perform additional actions in response to changes to the database schema. With event-based triggers, one can build more robust and automated database systems that can help improve the efficiency of the data.

Database 75

Database Best Practices Open Source C++ 75

SQL Performance

APRIL 14, 2021

I also love his efficient and eloquent writing style. I’ll do my testing in tempdb, enabling I/O and time statistics: SET NOCOUNT ON ; USE tempdb ; SET STATISTICS TIME , IO ON ; Limitations of earlier ideas. Here’s the function’s definition: -- Helper dummy table. I love Paul White ’s work. Well, he did , and it’s fascinating!

C++ 112

C++ Servers Testing Code 112

Smashing Magazine

JULY 18, 2022

If you think that static rendering is limited to generic, public content that is the same for every user of your website, you should definitely read this article. There are many use cases: personalization, internationalization, theming, multi-tenancy, A/B tests…. There was something he wanted to C."; With a server and all!

Cache 115

Cache Website Energy Servers 115

Percona

SEPTEMBER 27, 2023

DEFAULT ‘on’::text Because we specified ‘2’ for premake in the create_parent function, you can observe that two partitions ahead have been created, as shown in the table definition below. schema.tablename p_control text You should partition the column, either integer or time-based.

Storage 100

Storage Open Source Database Efficiency 100

HammerDB

FEBRUARY 25, 2021

HammerDB is a load testing and benchmarking application for relational databases. All the databases that HammerDB tests implement a form of MVCC (multi-version concurrency control). For HammerDB both TPROC-C and TPROC-H run all of their workloads on the database being tested in SQL. and the following from TPROC-H.

Programming 67

Programming Benchmarking Virtualization C++ 67

SQL Performance

DECEMBER 9, 2020

In a comment to my article, Marcos Kirchner mentioned that he tested my solution with varying table value constructor cardinalities, and got different execution times for the different cardinalities. Testing different base table cardinalities is just one dimension to try. Let’s proceed to performance testing.

C++ 61

C++ Servers Testing Processing 61

All Things Distributed

DECEMBER 1, 2016

I was joined by 32,000 James Bonds at the conference today from all around the world, and we introduced new services focused on accelerating this transformation across development, testing and operations, data and analytics, and computation itself. Transformation in Development, Testing, & Operations.

AWS 162

AWS Development Lambda Open Source 162

Randon ASCII

OCTOBER 4, 2020

CPU power efficiency is strongly tied to how long the CPU can stay asleep ( 8+ ms is apparently a good number ), and random wakeups work against that. If multiple threads can synchronize or coalesce their timer waits then the system becomes more power efficient. That’s crazy! But that’s how Windows has always worked. Implications.

Programming 145

Programming Games Hardware Operating System 145

Sutter's Mill

FEBRUARY 8, 2021

Otherwise, it’s “just an assertion”: As with an assertion, if a postcondition is false then it means there is a bug, likely right there inside the function on which the postcondition is written (or in the postcondition itself), because if prior contracts were well tested then likely this function created the first unexpected state. [2]

C++ 45

C++ Lambda Efficiency Code 45

Sutter's Mill

JANUARY 25, 2021

On a humorous note, O(N) remains O(N) no matter how hard we try to make it efficient: MyAssert( std::is_sorted( std::execution::par, begin(s), end(s) ) ); // still O(N) arbitrarily expensive, but good try! That’s true whether we’re enabling checking at test time (e.g., What does the answer to Question 1 imply for assertion checking?

C++ 45

C++ Programming Cache Testing 45

Percona

DECEMBER 14, 2022

I was pretty optimistic that I’d truly have impressive numbers to share but as it turns out, while there is a potential for significant advantage, a detailed testing regime of the CITUS columnar store extension should be carried out before implementing them into your own environment. The missing sizzle. it does well. using heap. Conclusion.

Database 92

Database Analytics Storage Processing 92

SQL Performance

MAY 11, 2022

Naturally, if a partitioning or ordering element doesn’t appear in the window function, you omit that part from the index definition. SQL Server doesn't currently support an efficient combination of a parallel order-preserving input prior to a parallel batch-mode Window Aggregate operator. I’ll remind you at the end.

C++ 133

C++ Database Servers Code 133

The Morning Paper

NOVEMBER 7, 2019

The definition of root cause itself is taken from Wilson : “Root cause is that most basic reason for an undesirable condition or problem which, if eliminated or corrected, would have prevented it from existing or occurring.” Kairux sets breakpoints at all of these locations and runs the test that reproduces the failure.

Programming 47

Programming Java C++ Testing 47

SQL Performance

JUNE 10, 2020

Recall that a relation’s body—being a set of tuples—by definition has no duplicates. Customers AS C WHERE EXISTS ( SELECT * FROM Sales. custid = C. Customers AS C LEFT OUTER JOIN Sales. Orders AS O ON C. custid , C. orderid , ROW_NUMBER ( ) OVER ( PARTITION BY C. Orders AS O ON C.

C++ 109

C++ Database Servers Code 109

Smashing Magazine

AUGUST 9, 2021

This explains the challenges involved in deploying and testing HTTP/3 yourself. QUIC is needed because TCP, which has been around since the early days of the Internet, was not really built with maximum efficiency in mind. For example, if we have files A, B, and C, we would have three TCP connections. For HTTP/1.1,

Transportation 145

Transportation Internet Internet Network 145

SQL Performance

JUNE 10, 2020

Recall that a relation’s body—being a set of tuples—by definition has no duplicates. Customers AS C WHERE EXISTS ( SELECT * FROM Sales. custid = C. Customers AS C LEFT OUTER JOIN Sales. Orders AS O ON C. custid , C. orderid , ROW_NUMBER ( ) OVER ( PARTITION BY C. Orders AS O ON C.

C++ 93

C++ Database Servers Code 93

SQL Performance

MAY 8, 2019

GetNums ( 1 , 100 ) AS C WHERE C. If you haven’t figured it out yet, look closely at the definitions of both tables—specifically the column names—and at the column names used in the query. GetNums ( 1 , 100 ) AS C WHERE C. custid , C. Customers AS C WHERE NOT EXISTS ( SELECT * FROM dbo.

Best Practices 68

Best Practices C++ Code Servers 68

Smashing Magazine

AUGUST 22, 2021

This explains the challenges involved in deploying and testing HTTP/3 yourself. While a perfect understanding of these concepts is not needed for the rest of this post, having a common high-level definition would be good. Initial tests by Google , for example, show low percentage improvements for its use cases. Large preview ).

Performance 106

Performance Network Latency Servers 106

SQL Performance

SEPTEMBER 2, 2021

If you wish to use CLR, you should definitely borrow code from fellow MVP Adam Machanic before thinking about writing your own (I've blogged before about re-inventing the wheel , and it also applies to free code snippets like this). He spent a lot of time fine-tuning this CLR function to efficiently parse a string. strings. (

C++ 59

C++ Servers Testing Database 59

O'Reilly

MAY 19, 2020

However, a notable minority—some 15%—occupy C-level or executive roles. We could have specified a narrow definition of cloud—inclusive of the SaaS, PaaS, and infrastructure-as-a-service (IaaS) cloud; exclusive of cloud-based email, office productivity, etc.—but And about 10% work in technical management positions.

Cloud 141

Cloud Serverless AWS Architecture 141

Smashing Magazine

SEPTEMBER 6, 2021

This explains the challenges involved in deploying and testing HTTP/3 yourself. For example, you could reduce compression efficiency , because that works better with more data. In our own early tests , I found seriously diminishing returns at about 40 files. This is more in-depth and technical. Changes To Pages And Resources.

Network 105

Network Servers Cache Traffic 105

Randon ASCII

APRIL 17, 2018

CPU usage is shown for the the approximately five seconds that my test script took to run: It seems reasonable that python.exe running my script would be using the majority of the CPU time and it seems reasonable that the System process would be doing some bookkeeping as I add and remove files. You know where to find me.

Monitoring 43

Monitoring C++ Code Processing 43

Smashing Magazine

NOVEMBER 30, 2021

Adding A Dyslexia-Friendly Mode To A Website written by John C Barstow. And so we can definitely dig into that in a bunch of different angles, depending on where you want to take this conversation. Wildcard Subdomains written by Sam Poder. Improving The Performance Of Wix Websites written by Dan Shappir. How To Maintain A Large Next.js

Technology 94

Technology Technology Servers Code 94

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. Let us start with a basic definition of the single-objective recommendation task that is widely used in the literature on the recommender systems. the action is to introduce a completely new service).

Retail 152

Retail C++ Analytics Metrics 152

Smashing Magazine

JANUARY 11, 2021

Testing And Monitoring Auditing workflow, proxy browsers, 404 page, GDPR cookie consent prompts, performance diagnostics CSS, accessibility. You can then mimic the 90th percentile’s experience for testing. Now you have something measurable to test against. Quick Wins. Download The Checklist (PDF, Apple Pages, MS Word).

Performance 145

Performance Cache Media Metrics 145

Smashing Magazine

JANUARY 7, 2019

Testing And Monitoring. You can then mimic the 90th percentile’s experience for testing. And if you are using CI to test the budgets, you need to make sure your tested environment matches CrUX if you used CrUX for setting the target ( thanks Patrick Meenan! ). Now you have something measurable to test against.

Performance 104

Performance Cache Network Metrics 104

High Scalability

NOVEMBER 25, 2019

Version7 (Future): Move all compute to the public cloud, carve out more services for impact isolation, dynamic resource pooling to manage pets and cattle efficiently. If you develop something then you own the lifecycle of that product, which means you would work with QA, DevOps to ensure it’s tested/deployed. Cloud Platform.

Architecture 52

Architecture Cache Azure Storage 52

Smashing Magazine

JANUARY 6, 2020

Testing And Monitoring. You can then mimic the 90th percentile’s experience for testing. Alternatively, you can also use Speed Scorecard (also provides a revenue impact estimator), Real User Experience Test Comparison or SiteSpeed CI (based on synthetic testing). Now you have something measurable to test against.

Performance 145

Performance Cache Network Metrics 145

Brendan Gregg

SEPTEMBER 5, 2017

We're now testing container hosts in production on btrfs, instead of ZFS. Facebook have been using btrfs for a while in production, and key btrfs developers now work at Facebook and continue its development. . - **eBPF**: tracing features completed in 2016, this provides efficient programmatic tracing to existing kernel frameworks.

Virtualization 76

Virtualization AWS Engineering Hardware 76