Sutter's Mill

JANUARY 25, 2021

We want a way to enable checking for some assertions but not others in the same code, because we may not always be able to afford expensive checks. Example 1(a)’s min <= max is at this other end of the scale: It’s so dirt cheap to check that it’s unlikely we’ll ever have a performance reason to disable it. [2] in production).

C++ 45

C++ Programming Cache Testing 45

Sutter's Mill

JANUARY 11, 2021

Assertions have been a foundational tool for writing understandable computer code since we could write computer code… far older than C’s assert() macro, they go back to at least John von Neumann and Herman Goldstine (1947) and Alan Turing (1949). Assertions are only about finding bugs, not doing program work.

C++ 58

C++ Programming Code Testing 58

MachMetrics

DECEMBER 12, 2019

The Implications of the ‘Badge of Shame’ At face value, this visual marker would provide a very clear and urgent incentive for developers to build their site in a performant, optimized way using today’s best practices. The badging program could very well have a similar effect. Wrapping up and looking forward.

Google 86

Google Website Best Practices Internet 86

Brendan Gregg

DECEMBER 21, 2019

For my AWS re:Invent talk on BPF Performance Analysis at Netflix, I began with a demo of "BPF superpowers" (aka eBPF). In the video I explained how I arrived at tracing __iwl_dbg() in this way, and how you can follow a similar approach for tracing unfamiliar code. My [BPF Performance Tools] book has plenty of examples.

C++ 52

C++ Education Java AWS 52

Brendan Gregg

DECEMBER 21, 2019

For my AWS re:Invent talk on BPF Performance Analysis at Netflix, I began with a demo of "BPF superpowers" (aka eBPF). In the video I explained how I arrived at tracing __iwl_dbg() in this way, and how you can follow a similar approach for tracing unfamiliar code. My [BPF Performance Tools] book has plenty of examples.

C++ 52

C++ Education Java AWS 52

Tasktop

OCTOBER 23, 2020

We believe that diverse teams perform better and foster an environment of belonging and inclusion. The code base has an open review process that every engineer can learn from with each change. We enjoy social hours such as team lunches, team exercises and happy hours. Would exercise and health be a good topic?

Tuning 52

Tuning Engineering Programming Infrastructure 52

ScaleOut Software

AUGUST 20, 2020

This allows application code to introspect on the dynamic behavior of each data source, maintain synthetic metrics which aid the analysis, and create alerts when conditions require. This exercises the model’s code and surfaces issues and exceptions, which can be readily examined and resolved in a controlled environment.

Cloud 52

Cloud Development Analytics Azure 52

ScaleOut Software

AUGUST 20, 2020

This allows application code to introspect on the dynamic behavior of each data source, maintain synthetic metrics which aid the analysis, and create alerts when conditions require. This exercises the model’s code and surfaces issues and exceptions, which can be readily examined and resolved in a controlled environment.

Cloud 52

Cloud Development Analytics Azure 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. Regression checks should start as soon as a new build is released for testing and should be repeated for every new code build.

Best Practices 52

Best Practices Testing Code Testing Tools 52

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

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. What do you see as the biggest challenge for performance and reliability? Dynatrace news.

Strategy 177

Strategy Performance Logistics Monitoring 177

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.

C++ 98

C++ Testing Design Strategy 98

Testlodge

AUGUST 9, 2023

The tester established a baseline by selecting the most critical, common, or obvious path through the code selection. Steps to Performing Basis Path Testing The first step is to create a control flow graph for a specified code section. The second step is to select a baseline path through the code.

Testing 75

Testing Software Software C++ 75

Dynatrace

MAY 15, 2020

How to assess an environment’s security posture, risk and threat profile, and possible attack vectors, where perhaps you didn’t code the application or build the infrastructure, and where new code is deployed frequently, and the infrastructure is constantly changing? And this poses a significant risk.

Government 225

Government DevOps Infrastructure Network 225

The Agile Manager

DECEMBER 17, 2008

Traditional IT projects are mass economy-of-scale exercises: once development begins, armies of developers are unleashed. Clearly, a small team delivering documentation is nowhere near as significant an event as a large team delivering executable code. An Agile team is not an exercise in scale.

Latency 40

Latency Code Metrics Testing 40

The Netflix TechBlog

DECEMBER 23, 2020

Titus is a multi-tenant system, allowing multiple teams and users to run workloads on the system, and ensuring they can all co-exist while still providing guarantees about security and performance. Various pieces of software used elevated capabilities for FUSE, low-level packet monitoring, and performance tracing amongst other use cases.

Media 286

Media Metrics Systems Processing 286

Percona

AUGUST 30, 2023

If a PostgreSQL user wants to change these values, they need to recompile the PostgreSQL from the source code. This can be changed later using the pg_checksums utility, but that will be a painful exercise on a big database. If, at all, there is any crash in between, I am OK to perform the ETL again. Type "help" for help.

Database 104

Database Servers Open Source Tuning 104

The Agile Manager

NOVEMBER 26, 2008

Program Management Offices (PMOs) are at the nexus of this. PMOs are responsible for keeping an eye on the performance of the IT project portfolio. This means that development of a bit of business functionality is splintered into independent effort performed by lots of specialists. Is it the business analyst? The QA tester?

Code 40

Code Servers Engineering Programming 40

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 138

DevOps Software Engineering Infrastructure Open Source 138

John McCalpin

AUGUST 1, 2018

Bandwidth, performance analysis has two recurring themes: How fast should this code (or “simple” variations on this code) run on this hardware? If I am analyzing (apparent) performance shortfalls, how can I distinguish between cause and effect ? The source code to the library may not be available.

Hardware 40

Hardware Transportation Performance Latency 40

The Morning Paper

DECEMBER 8, 2019

At the start of November I was privileged to attend HPTS (the High Performance Transaction Systems) conference in Asilomar. On the last morning of the conference Daniel Bittman presented some of the work being done in the context of the Twizzler OS project to explore new programming models for NVM. The Twizzler programming model.

Hardware 56

Hardware Programming Media Storage 56

Alex Russell

SEPTEMBER 20, 2020

"Appiness" is an illusion, an arbitrary line drawn to include programs built on some platforms but not others, and all of today's OSes allow multiple platforms to expose "real apps." Circa '07, those web apps were notably slower than native code could be. " Platforms, while plural, are not equal.

Hardware 64

Hardware Mobile Programming Java 64

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

The Morning Paper

AUGUST 27, 2019

Unfortunately strong consistency is at odds with performance… On the other hand weak consistency models… put a tremendous burden on the application designer to reason about the complex interleavings of operations that are allowed by these weak consistency models. A decision procedure for invariant confluence. We’re not there yet!

Programming 59

Programming Processing Database Systems 59

The Morning Paper

APRIL 16, 2019

Enabling students to build running performant versions of all of those systems in the time available is one challenge. In the core programming model, students provide implementations of Node subclasses which specify the behaviour of individual nodes in their distributed systems. Consider the lab exercise to implement Paxos.

Systems 43

Systems Efficiency Testing Strategy 43

O'Reilly Software

MARCH 7, 2018

Software today is not typically a single program—something that is executed by an operator or user, producing a result to that person—but rather a service : something that runs for the benefit of its consumers, a provider of value. The most common programming task in the world. Let’s dive into this concept for a bit.

Transportation 72

Transportation Java Programming Architecture 72

Randon ASCII

OCTOBER 20, 2019

The first digits of the addresses are different because the code is relocated on load, but the correspondence of the last four hex-digits (preserved over ASLR) is clear: RtlFindNextForwardRunClear: … 14006464F: 4C 3B C3 cmp r8,rbx. It is unclear why this code misbehaved so badly on this particular machine.

Processing 60

Processing Systems Code Software 60

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