The Morning Paper

MARCH 15, 2020

Understanding, detecting and localizing partial failures in large system software , Lou et al., Partial failures ( gray failures ) occur when some but not all of the functionalities of a system are broken. Here are the key findings: Partial failures appear throughout the release history of each system, 54% within the last three years.

Systems 98

Systems Software Software Programming 98

Dynatrace

JUNE 1, 2023

It represents the percentage of time a system or service is expected to be accessible and functioning correctly. Response time Response time refers to the total time it takes for a system to process a request or complete an operation. This SLO enables a smooth and uninterrupted exercise-tracking experience.

Traffic 173

Traffic Latency Website Virtualization 173

Dynatrace

DECEMBER 5, 2023

Do material incidents on “third-party systems” require disclosure? The mandate explains why this is the case: “A reasonable investor would [not] view a significant breach of a registrant’s data as immaterial merely because the data were housed on a third-party system ….

Best Practices 260

Best Practices Government C++ Education 260

Dynatrace

JUNE 27, 2022

These development and testing practices ensure the performance of critical applications and resources to deliver loyalty-building user experiences. However, not all user monitoring systems are created equal. The ability to identify application performance issues and potential issues by running interval tests.

Best Practices 183

Best Practices Monitoring Wireless Traffic 183

Dynatrace

APRIL 5, 2024

However, it’s essential to exercise caution: Limit the quantity of SLOs while ensuring they are well-defined and aligned with business and functional objectives. Error budget burn rate = Error Rate / (1 – Target) Best practices in SLO configuration To detect if an entity is a good candidate for strong SLO, test your SLO.

Efficiency 234

Efficiency Traffic Tuning Metrics 234

Dynatrace

MARCH 14, 2022

As patient care continues to evolve, IT teams have accelerated this shift from legacy, on-premises systems to cloud technology to more build, test, and deploy software, and fuel healthcare innovation. That includes failures in parts of a system that occur at similar times and have a common root cause. Emerging security threats.

Healthcare 234

Healthcare Artificial Intelligence Innovation Strategy 234

Dynatrace

DECEMBER 10, 2020

I recently joined two industry veterans and Dynatrace partners, Syed Husain of Orasi and Paul Bruce of Neotys as panelists to discuss how performance engineering and test strategies have evolved as it pertains to customer experience. Dynatrace news. This blog summarizes our great conversation for the posed questions.

Strategy 186

Strategy Performance Logistics Monitoring 186

Smashing Magazine

SEPTEMBER 2, 2021

On design systems, CSS/JS and UX. CSS Selectors Cheatsheet is an interactive exercise to test your understanding of CSS selectors. The first few are fairly easy but the exercises increase in difficulty as you get into more advanced selectors like lesser-used pseudo-classes. TypeScript Exercises. Grid Garden.

Development 145

Development Games Education Programming 145

The Morning Paper

APRIL 16, 2019

Teaching rigorous distributed systems with efficient model checking Michael et al., It describes the labs environment, DSLabs , developed at the University of Washington to accompany a course in distributed systems. Enabling students to build running performant versions of all of those systems in the time available is one challenge.

Systems 43

Systems Efficiency Testing Strategy 43

Smashing Magazine

OCTOBER 13, 2021

You can always ask a question live , you can share your screen and get immediate feedback, and you can work on group exercises with people around the world. Live discussions and interactive exercises are at the very heart of every workshop, with group work, homework, reviews and live interaction with people around the world.

Design 87

Design Programming Testing Systems 87

The Netflix TechBlog

SEPTEMBER 8, 2020

Migration Testing Infrastructure Our monolith had been around for many years and hadn’t been created with functional and unit testing in mind, so those were independently bolted on by each UI team. For the migration, testing was a first-class citizen. Replay Testing Enter replay testing.

Latency 233

Latency Cache Java Traffic 233

The Morning Paper

SEPTEMBER 24, 2019

50 ways to leak your data: an exploration of apps’ circumvention of the Android permissions system Reardon et al., Side-channels are typically an unintentional consequence of a complicated system. The test mobile phones run an instrumented version of Android Marshmallow, on top of a custom Linux kernel which records all file I/O.

Systems 74

Systems Traffic Network Google 74

Dynatrace

APRIL 21, 2022

Once you have and understand this data, you can identify issues, find opportunities for improvement, and eliminate risks before you go through a costly migration exercise. To optimize your back-end systems, you can use the service flow view within Dynatrace to identify layers of application architecture.

Azure 197

Azure Monitoring Virtualization Metrics 197

The Netflix TechBlog

MAY 27, 2020

Reliability, formally speaking, is the ability of a system to function under stated conditions for a period of time. Put simply, reliability means a system should work and continue working. assisting the responding service owners with understanding what systems are contributing to the incident Liaison?—?communicating

Engineering 104

Engineering Innovation Systems Architecture 104

Particular Software

MARCH 28, 2022

Saga scenario testing While we were making it easier to write sagas, we thought it was also essential to make it easier to test them. So the newest version of our testing framework now includes tools to perform saga scenario testing , which are more expressive than testing sagas with standard unit tests.

Development 52

Development C++ Virtualization Metrics 52

Adrian Cockcroft

MARCH 17, 2020

Picture taken by Adrian March 17, 2020 A resilient system continues to operate successfully in the presence of failures. There are many possible failure modes, and each exercises a different aspect of resilience. Hence, one way to reduce risk is to make systems more observable. The first technique is the most generally useful.

Healthcare 52

Healthcare Government Airlines Systems 52

HammerDB

APRIL 19, 2023

Instead, focus on understanding what the workloads exercise to help us determine how to best use them to aid our performance assessment. Therefore, before we attempt to measure our database performance, we should know the system or cloud instance to be tested in detail. Operating System: Ubuntu 22.04

Performance 54

Performance Benchmarking Cache Storage 54

Scalegrid

APRIL 16, 2020

Use Follower Clusters keep two independent database systems (of the same type) in sync so you can analyze, optimize and test app performance for MySQL, PostgreSQL and MongoDB® database. The availability of a computer system is the percentage of time its services are up during a period of time. Expert Tip. Security Groups.

Cloud 242

Cloud Azure AWS Database 242

Dynatrace

SEPTEMBER 30, 2021

Hosted and moderated by Amazon, AWS GameDay is a hands-on, collaborative, gamified learning exercise for applying AWS services and cloud skills to real-world scenarios. Take a trial test at Linux Academy if it’s applicable to the cert you have in mind. Then this one’s for you. Keep your AWS certifications fresh.

AWS 218

AWS Best Practices Analytics Cloud 218

Percona

AUGUST 30, 2023

This can be changed later using the pg_checksums utility, but that will be a painful exercise on a big database. cat /usr/lib/systemd/system/postgresql-14.service. That is where all “ALTER SYSTEM SET/RESET” commands keep the information. But another database might be an OLAP system.

Database 103

Database Servers Open Source Tuning 103

The Morning Paper

NOVEMBER 3, 2019

The authors selected a set of diverse application workloads, as shown in the table below, and analysed their execution to find out the system call frequency and total execution time. A micro-benchmark suite, LEBench was then built around tee system calls responsible for most of the time spent in the kernel. Headline results.

Performance 108

Performance Benchmarking Tuning Hardware 108

HammerDB

JULY 16, 2021

When a system ‘scales’ it is able to deliver higher levels of performance proportional to the system resources available to it. In particular, this means as we add CPU cores and increase the system load, we see higher performance. Vuser 1:Timing test period of 5 in minutes Vuser 1:1., and MySQL 8.0.25

Virtualization 57

Virtualization Performance C++ Database 57

Tasktop

FEBRUARY 24, 2021

Get together once a year for a value stream mapping exercise, and you’ll emerge with a list of potential improvement hypotheses. . But from all those hotspots, identifying the system constraint , the one big, juicy bottleneck that is at this very moment is negating and undermining the benefits from your optimization efforts?

Healthcare 52

Healthcare Retail Metrics Innovation 52

O'Reilly

DECEMBER 12, 2023

This ruling in itself raises many questions: how much creativity is needed, and is that the same kind of creativity that an artist exercises with a paintbrush? I can also ask for a reading list about plagues in 16th century England, algorithms for testing prime numbers, or anything else.

Artificial Intelligence 100

Artificial Intelligence Media Google Processing 100

The Agile Manager

OCTOBER 31, 2020

This was no small task given the mismatch between a fine granularity of rules on the one hand and a coarse granularity of test cases on the other. The rules were implemented as IFTTT statements in a low-code language that did not allow them to be tested in isolation. In just about every circumstance, it was false results.

Programming 59

Programming Testing Code Technology 59

Dynatrace

SEPTEMBER 20, 2019

The new version of the application is deployed in the green environment and tested for functionality and performance. Once the testing results are successful, application traffic is routed from blue to green. Let’s assume your team has just pushed new code and it passed pre-deployment testing.

Systems 27

Systems Traffic DevOps Database 27

The Morning Paper

OCTOBER 8, 2019

New models are tested online through an A/B testing framework to compare their performance to previous generations. “ This made the moment ripe for trying sweeping changes to the system.” “ As a result, it required rethinking the entire system surrounding the model.” The time is right.

Network 82

Network Architecture Tuning Traffic 82

Apica

SEPTEMBER 21, 2020

With thousands of monitors in your current system, making the change can be a daunting prospect. First, we will examine your current monitoring system. If you are using a system such as LoadRunner , for example, the process is very simple. We will conduct a sizing exercise to make sure things are set up for the best performance.

Monitoring 52

Monitoring Tuning Virtualization Cloud 52

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? Regression tests should be performed just after the sanity testing is complete.

Best Practices 52

Best Practices Testing Code Testing Tools 52

Percona

DECEMBER 5, 2023

The scenario Service considerations In this exercise, we wanted to perform a major version upgrade from PostgreSQL v12.16 This approach will empower database managers to evolve their systems with minimal interruption, leveraging the best of PITR and logical replication for smoother version upgrades. to PostgreSQL v15.4.

Database 77

Database Traffic C++ Servers 77

O'Reilly

JUNE 27, 2023

Because most of those have been deployed in such a way that they are only communicating with trusted internal systems. Red-team exercises can uncover weaknesses in the system while it’s still under development. Why not take the extra time to test for problems? That’s because it is.

Social Media 89

Social Media Media Website Database 89

Adrian Cockcroft

NOVEMBER 11, 2019

A resilient system continues to operate successfully in the presence of failures. There are many possible failure modes, and each exercises a different aspect of resilience. Hence, one way to reduce risk is to make systems more observable. This discussion focuses on hardware, software and operational failure modes.

Latency 52

Latency Engineering Systems Hardware 52

Sutter's Mill

JANUARY 25, 2021

That’s true whether we’re enabling checking at test time (e.g., Some conditions are so expensive that we may never check them without a good reason, even in testing. If you develop your own assertion system for in-house use, support enabling/disabling at least these kinds of assertions independently. [1] in production).

C++ 45

C++ Programming Cache Testing 45

Percona

JULY 6, 2023

Performance is one of the essential aspects of a database management system. then true else false end FROM generate_series(1, 10000000); Now we have our test table with some dummy data so we can practice. then true else false end FROM generate_series(1, 10000000); Now we have our test table with some dummy data so we can practice.

Best Practices 90

Best Practices Tuning Database Testing 90

Tasktop

FEBRUARY 24, 2021

Get together once a year for a value stream mapping exercise, and you’ll emerge with a list of potential improvement hypotheses. . But from all those hotspots, identifying the system constraint , the one big, juicy bottleneck that at this very moment is negating and undermining the benefits from your optimization efforts?

Healthcare 40

Healthcare Retail Metrics Innovation 40

The Agile Manager

MAY 31, 2021

Additional or more comprehensive capabilities that come standard with a new COTS product; lower labor intensity and less dependency on costly knowledge workers required to sustain legacy assets; and reducing systemic fragility (e.g., production downtime) are all very real economic benefits that have P&L impact.

C++ 52

C++ Efficiency Systems Technology 52

The Morning Paper

JULY 4, 2019

Are you ready to take your system assurance programme to the next level? The ‘controlled’ part is important here because given the scale and complexity of the environment under test, the only meaningful place to do this is in production with real users. a bug fix, configuration change, new feature, or A/B test).

Latency 77

Latency Engineering Metrics Traffic 77