The Netflix TechBlog

SEPTEMBER 8, 2020

On the Android team, while most of our time is spent working on the app, we are also responsible for maintaining this backend that our app communicates with, and its orchestration code. Image taken from a previously published blog post As you can see, our code was just a part (#2 in the diagram) of this monolithic service.

Latency 233

Latency Cache Java Traffic 233

The Morning Paper

APRIL 16, 2019

Teaching rigorous distributed systems with efficient model checking Michael et al., Testing and grading their solutions is another! Although we added tests to catch specific issues as we learned of them, we found it difficult to keep up with the diversity of possible student errors. Testing and model checking.

Systems 43

Systems Efficiency Testing Strategy 43

The Agile Manager

MARCH 31, 2024

As a learning exercise, it is fantastic. Those tests have limited information value: they either work or they do not work. Without a lot of post-test study, we don’t necessarily know why. This is not to say these coarse tests are without information value. Indirect tax?

FinTech 40

FinTech Education Testing Website 40

The Netflix TechBlog

FEBRUARY 10, 2021

It can be a nightmare to work efficiently. We wanted a way to ensure that we can have a consistent user experience while also sharing as much code as possible. Depending on which solution you choose, you could be inheriting a ton of issues or something that is battle tested. Do your research and don’t be afraid to ask around!

Design 230

Design Systems Engineering Entertainment 230

The Netflix TechBlog

MAY 27, 2020

From failure injection testing to regularly exercising our region evacuation abilities, Netflix engineers invest a lot in ensuring the services that comprise Netflix are robust and reliable. Reliability, formally speaking, is the ability of a system to function under stated conditions for a period of time.

Engineering 104

Engineering Innovation Systems Architecture 104

The Netflix TechBlog

MARCH 6, 2019

This is just one of many use cases that MezzFS supports, but all the use cases share a similar theme: stream the right bits of a remote object efficiently and expose those bits as a file on the filesystem. MezzFS collects metrics on data throughput, download efficiency, resource usage, etc. Its logs are collected in an ELK stack.

Media 214

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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 are the performance numbers that I got in my test: CPU time = 10032 ms, elapsed time = 10025 ms. logical reads 0.

C++ 112

C++ Servers Testing Code 112

O'Reilly

OCTOBER 19, 2021

If you peek under the hood of an ML-powered application, these days you will often find a repository of Python code. Let’s start by considering the job of a non-ML software engineer: writing traditional software deals with well-defined, narrowly-scoped inputs, which the engineer can exhaustively and cleanly model in the code.

DevOps 137

DevOps Software Engineering Infrastructure Open Source 137

Sutter's Mill

MAY 1, 2023

This update covers Acknowledgments, and highlights of what’s new in the compiler and language since last time, including: simple, mathematically safe, and efficient chained comparisons named break and continue “simple and safe” starts with. For example, see the test case pure2-types-order-independence-and-nesting.cpp2.

C++ 97

C++ Virtualization Lambda Code 97

Testsigma

MARCH 6, 2020

Regression testing comprises re-running the test cases of already stable features and finding out if the new code changes attributed to the new release led to any negative impacts on the existing functionalities. When is Regression Testing done? Read here to know how to implement different types of regression testing.

Best Practices 52

Best Practices Testing Code Testing Tools 52

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?

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C++ Programming Cache Testing 45

SQL Performance

JANUARY 12, 2022

Despite the poor performance, working on the solution is an interesting exercise. Use the following code to create the table and populate it with a small set of sample data: DROP TABLE IF EXISTS dbo. ( ID INT NOT NULL IDENTITY ( 1 , 1 ) CONSTRAINT pk_Auctions PRIMARY KEY CLUSTERED , Code CHAR ( 1 ) NOT NULL.

Code 116

Code Servers Performance Azure 116

Sutter's Mill

FEBRUARY 17, 2020

Otherwise, you’ll either get the implicitly generated move functions, or else requests to move will automatically just do a copy instead, since copy is always a valid implementation of move (it just doesn’t exercise the non- const option). Yes, in my view it does make it a buggy class that shouldn’t pass code review.

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C++ Testing Design Strategy 98

The Agile Manager

AUGUST 31, 2020

Decades of poor architecture guidelines and lax developer discipline resulted in the commercial-off-the-shelf components of an ERP becoming inseparable from the custom code built around it. The exercise of assessing, modeling and dispositioning the landscape does offer valuable new ways of looking at legacy assets.

Architecture 52

Architecture Code Strategy Programming 52

Alex Russell

AUGUST 30, 2021

Anyone who cares to download and fork the code can do so. " The eventual Blink fork was precipitated by an insurmountable difficulty in doing precisely what Apple suggested to Congress: contributing code upstream to WebKit to enable new features. It's worth assessing these claims from most easily falsified to most contested.

Engineering 98

Engineering Open Source Website Operating System 98

SQL Server According to Bob

JUNE 27, 2016

Before joining Microsoft in 1994 I worked at State Farm Insurance and spent several years in a testing group and later joined a team developing applications against SQL Server for OS/2. We developed a friendly competition to break one another’s code. Then I cranked up the tests to high stress levels and they passed.

Servers 40

Servers Games Azure Software Engineering 40

SQL Performance

JUNE 10, 2020

That is, does SQL Server perform a substitution process whereby it converts the original nested code into one query that goes directly against the base tables? The answer is simple, to shorten the code by having the inner query use the infamous SELECT *. And if so, is there a way to instruct SQL Server to avoid this unnesting process?

C++ 109

C++ Database Servers Code 109

SQL Performance

JUNE 10, 2020

That is, does SQL Server perform a substitution process whereby it converts the original nested code into one query that goes directly against the base tables? The answer is simple, to shorten the code by having the inner query use the infamous SELECT *. And if so, is there a way to instruct SQL Server to avoid this unnesting process?

C++ 93

C++ Database Servers Code 93

John McCalpin

JANUARY 22, 2018

Introduction: In December 2017, my colleague Damon McDougall (now at AMD) asked for help in porting the fused multiply-add example code from a Colfax report ( [link] ) to the Xeon Phi x200 (Knights Landing) processors here at TACC. Instead, we found puzzle after puzzle. Instead, we found puzzle after puzzle.

Latency 40

Latency Hardware Code Testing 40

Brendan Gregg

NOVEMBER 13, 2017

There's also the "[No A **e Rule]", popularized by a bestselling book of this title, which provides the following [test]: 1. Here's a test for you or your company: Would you tolerate a brilliant engineer who is also an a **e? Alice is great at fixing hard bugs, writing test suites, doing code merges, and other unglamorous work.

Engineering 111

Engineering Energy Technology Technology 111

The Agile Manager

FEBRUARY 23, 2009

For example, in the Java world we can measure all kinds of attributes of code: overcomplicated expressions, wasteful use of resources, ghost code, duplicate code, complexity, and so forth. Good in the sense that code quality doesn’t need to be taken for granted, because we can measure attributes of the asset we’re creating.

Government 40

Government Metrics Java Code 40

The Agile Manager

APRIL 14, 2009

As you stand up Agile projects, define each of your gatekeepers to be functional, tested, useful and deployable asset. Don't assume that this is simply an exercise in implementing tools, and be prepared to iterate to achieve greater degrees of transparency. Be aware that there are ramifications to increasing team visibility.

Games 40

Games Government Metrics Testing 40

The Agile Manager

OCTOBER 28, 2007

They go on to report that 70% of the cases of these 7 chronic illnesses are preventable through lifestyle change: diet, exercise, avoiding cigarettes and what not. In lifestyle terms, I may avoid certain actions that may cause cancer, but if cancer is written into my genetic code the deck is stacked against me.

Government 40

Government Retail Energy Code 40

The Agile Manager

JUNE 26, 2010

A business requirement to algorithmically trade based on fluctuations in MACD , volume weighted average price and sunspot activity has a pretty clear business value: analysis before we code it tells us some combination of market and cosmic events leads to some occasional market condition that we expect we can capitalize on.

Software 40

Software Software Technology Technology 40