Expert insights. Personalized for you.
python programming scaling performaceAs a programmer we have written codes that ideally solves a problem, but do we take note of the performance when it comes to solving a problem, or do we just feel comfortable with “My code works?" " Don’t stop there, take your thinking bigger than “My code works” to “Can my code solve a huge problem?” as this is where thinking on a performance level comes in. MORE
performance testing programming test automation developers automated testing automated testing best practices automated testing frameworksI'm a Developer Advocate and one of the things I love most about my role is that I travel all of over the world — meeting and consulting with engineering teams, and discussing the challenges that they face. One thing that I've realized about building quality software is.the struggle is real! MORE
Introduction. Observability is the ability to understand the internal state of your system by looking at what is happening externally. In a software system, in order to acquire observability, we mainly implement the following aspects: logging, metrics, and tracing. Especially when we are moving away from monolithic software systems to microservices-based architectures, observability becomes a key aspect of the system design. MORE
There is always a lot of uncertainty around which programming language to use when starting a new test automation project. You may also like: 10 Programming Languages You Should Know in 2019. java javascript ruby python c# test automation programming languages ui testingWhich language do you use for test automation? Should you go with the same language that the development team is using? MORE
Want your Go programs to run faster? programming go golang programming examples golang app developmentOptimizing string comparisons in Go can improve your application’s response time and help scalability. MORE
A lot of attention is given to programming languages. Does it really matter what programming languages you know though? Many companies list positions such as “PHP Developer” or “Java Programmer”. Those interested in learning how to code often ask what language they should learn. Developers themselves argue over the merits of various languages. There are a growing number of people, including myself, that don’t take known languages into account when hiring MORE
To address this problem, we devised a Usability Testing Program — which, as a smaller company — presented us with some interesting challenges. Challenge 1: Not enough dedicated resources available to run the Usability Testing Program. For our Usability Testing Program we faced two resource-based challenges: Ideally, we need one facilitator and at least one note-taker. Testing Tasktop Integration Hub ’s user experience is a rather complex undertaking. MORE
Parallel programming solves big numerical problems by dividing them into smaller sub-tasks, and hence reduces the overall computational time on multi-processor and/or multi-core machines. Parallel programming is well supported in traditional programming languages like C and FORTRAN, which are suitable for “heavy-duty” computational tasks. In serial programming we can use the following code to compute and print the result, via list comprehension. MORE
I recently found myself explaining the concept of thread and thread pools to my team. We encountered a complicated threads-problem at our production environment that led us to review and analyze some legacy code. Although it threw me back to the basics, it was beneficial to review.NET capabilities and features in managing threads, which mainly reflected how.NET evolved significantly throughout the years. MORE
In the previous post we introduced the Pool class of the multiprocessing module. In this post we continue on and introduce the Process class , which makes it possible to have direct control over individual processes. A process can be created by providing a target function and its input arguments to the Process constructor. The process can then be started with the start method and ended using the join method. Below is a very simple example that prints the square of a number. MORE
Python has long been a popular programming language in the networking space because it’s an intuitive language that allows engineers to quickly solve networking problems. programming python netflixoss data-science netflixBy Pythonistas at Netflix, coordinated by Amjith Ramanujam and edited by Ellen Livengood As many of us prepare to go to PyCon, we wanted to share a sampling of how Python is used at Netflix. MORE
While working on the implementation of the MPI version of the STREAM benchmark, I realized that there were some subtleties in timing that could easily lead to inaccurate and/or misleading results. This post is a transcription of my notes as I looked at the issues… Primary requirement: I want a measure of wall clock time that is guaranteed to start before any rank does work and to end after all ranks have finished their work. MORE
Why not learn test programming strategies and approaches? When you're looking for places to learn test programming, Test Automation University has you covered. What do you do when you have lots of free time on your hands? MORE
We’ve recently joined forces with Hackerone , the industry leader in external bug bounty programs. Wait, what is a bug bounty program? According to Hackerone a bug bounty program is described as: A program where ethical hackers are invited to report security vulnerabilities to organizations, in exchange for monetary rewards for useful submissions. They can then browse for all public bug bounty programs to participate in. Dynatrace news. MORE
In part 1 of this post , we introduced the mpi4py module (MPI for Python) which provides an object-oriented interface for Python resembling the message passing interface (MPI) and enables Python programs to exploit multiple processors on multiple compute nodes. As we mentioned in part 1 of this post , collective communication methods are very useful in parallel programming. MORE
tutorial performance api test automation api testing testing and qa application programming interface testing as a service testing tutorial api testNowadays API testing is an integral part of testing. There are a lot of tools like postman, insomnia, etc. MORE
The supported programming languages for PostgreSQL include.Net, C, C++, Delphi, Java, JavaScript (Node.js), Perl, PHP, Python and Tcl, but PostgreSQL can support many server-side procedural languages through its available extensions. We found that Java is the most popular programming language for PostgreSQL, being leveraged by 31.1% Python was the second most popular programming language used with PostgreSQL, coming in close at an average of 28.9% MORE
In this first half of the interview, the two covered: performance programming software testing test automation podcast software qualityIn these two Quality Sense episodes, host, Federico, delves into an entertaining and eye-opening discussion with Alan Richardson, a British consultant also known as “ Evil Tester.” With more than 25 years of experience in testing and development, he offers consultancy and training in agile testing and test automation. MORE
This stack overflow graph of major programming languages’ growth exclusively depicts the steady progress of the PYTHON! Python programming language is better used for app development, web app or web development, game development, scientific computing, system administration, etc. MORE
Before you begin, be sure to sign-up for the Preview program. Once you’ve received your invitation to the Preview program you need to: 1. How to participate in the Preview Program. Dynatrace news. MORE
These things are also good to have in the tools we use to build software, especially programming languages. When we talk about UX, we often refer to the UX of the products we build and use. We want our products to be easy to use. Interactions should be quick. Mistakes should be easy to recover from. I’ve worked in a fair number of languages: Java for almost 15 years, PHP for 8, Javascript for 8, and dabbled in a few others like C# and Go MORE
Digital twin models for stateful stream-processing have evolved from concepts largely unrelated to object-oriented programming, in particular, product life-cycle management and industrial IoT (where they are often called device twins ). Architecture Featured Performance Products Programming Techniques Technology data-parallel computing digital twin in-memory computing in-memory data grid object-oriented programming ScaleOut StreamServer stream processing MORE
In previous posts we have introduced the multiprocessing module which makes it possible to parallelize Python programs on shared memory systems. This module provides an object-oriented interface that resembles the message passing interface (MPI) , and hence allows Python programs to exploit multiple processors on multiple compute nodes. Now we can write our first Python program with mpi4py. MORE
This is why we are excited to announce that Dynatrace has joined ServiceNow’s Service Graph Connector Program. The post Dynatrace joins ServiceNow Service Graph Connector Program appeared first on Dynatrace blog. Dynatrace news. MORE
Successfully programming an application requires an ingenious mix of lines of code that combine to bring life and versatility to the application. javascript tutorial performance programming performance optimizationYou’ll need to make several decisions while attempting to find solutions to a bigger set of problems. MORE
A Demo Application Shows How Companies Can Track COVID-19 Contacts Within Companies. Until a COVID-19 vaccine is widely available, getting back to work means keeping a close watch for outbreaks and quickly containing them when they occur. MORE
performance spring java (programming lang. Learn more about JUnit and Byteman! Testing asynchronous operations might cause some troubles and usually requires few challenges and also code changes (even in production code). In this article, we can find how to test such operations in an application that uses spring context (with asynchronous operations enabled). We don’t have to change the production code to achieve this. junit 4 asynchronous testing byteman script MORE
When we kicked off our user research program, our goal was to generate objective data to guide our UX decisions. While designing this program, our limited set of users was something we had to consider. To build momentum, we kicked off the program using internal stakeholders as our test subjects. The post Bootstrapping a Usability Testing Program appeared first on Tasktop Blog. MORE
If your customers don’t know what’s slowing them down, or why their Agile and DevOps transformations are hitting a wall, then the Flow Partner Program is for you. About the Flow Partner Program. Key Program Highlights. Get Involved with the Flow Partner Program. MORE
A few months ago, I claimed that naming is the hardest programming problem. The true hardest problem is one that impacts every developer at every skill level, across all programming languages, regardless of experience. It is equally applicable across all programming disciplines. The hardest problem in programming is this: performance tight coupling weak couplingI was wrong. MORE
As a tribute in honor of Dennis Ritchie’s passing , I’d like to invite you to share your thoughts in this post’s comments about your first C program – either the code if you remember it approximately, or a story about when you wrote it. I wrote my first C program in 1988 as a lab assignment for a fourth-year course in computer graphics at the University of Waterloo. MORE
The mock development environment is shown below: Once a model has been created, it can be tested using a client test program that sends messages that simulate the behavior of one or more data sources. Simplifying the Development Process with Mock Environments. MORE
And how are they different from streaming pipelines like Azure Stream Analytics and Apache Flink/Beam? What Problems Does Streaming Analytics Solve? MORE
Architecture Featured Features Performance Products Programming Techniques Technology CRUD APIs data-parallel computing distributed caching high availability in-memory data grid object-oriented programming real-time analytics scalability MORE
performance api memory cpu java (programming lang. What happens when you're out of memory? You may also like: Java Out of Memory Heap Analysis. Recently we experienced an interesting production problem. This application was running on multiple AWS EC2 instances behind Elastic Load Balancer. The application was running on a GNU/Linux OS, Java 8, Tomcat 8 application server. All of a sudden, one of the application instances became unresponsive. MORE
The Working Set Model for Program Behavior , Peter J. This weekend we go back in time all the way to the beginning of operating systems research. In the first SOSP conference in 1967 there were several papers that laid the foundation for the development of structured operating systems. MORE
Digital twin models for stateful stream-processing have evolved from concepts largely unrelated to object-oriented programming, in particular, product life-cycle management and industrial IoT (where they are often called device twins ). The post Object-Oriented Programming Simplifies Digital Twins appeared first on ScaleOut Software. These are exciting times in the evolution of stream-processing. MORE
Programs, life cycles, and laws of software evolution , Lehman, Proc. For more than two decades, however, the programming fraternity, and through them the computer-user community, has faced serious problems achieving this. On programming, projects, and products. All change beyond the first version of the program is grouped by Lehman under the term maintenance. Programs must be made more alterable , and the alterability maintained throughout their lifetime. MORE
Architecture Featured Features Performance Products Programming Techniques Technology CRUD APIs data-parallel computing distributed caching high availability in-memory data grid object-oriented programming real-time analytics scalability MORE
tutorial performance integration docker java (programming lang The popularity of microservices and the use of third-party services for non-business critical features have drastically increased the number of integrations that make up the modern application. These days, it is commonplace to use MyS QL, Redis as a key-value store, MongoDB, Postgress, and InfluxDB — and that is all just for the database — let alone the multiple services that make up other parts of the application. MORE
Three years on from the introduction of the Dynatrace Partner Program, I’m excited to share with you a significant, evolutionary step in our P artner P rogram – the introduction of the Dynatrace Partner Competency Program. . Dynatrace news. MORE
Tamar Eilam offers an overview of cloud-native programming and outlines a path toward the unification of the cloud programming model. Continue reading The future of cloud-native programming MORE
HackPPL: a universal probabilistic programming language Ai et al., The Hack programming language, as the authors proudly tell us, is “ a dominant web development language across large technology firms with over 100 million lines of production code.” I’m not sure how it should officially be pronounced, but I can tell you that PPL stands for “probabilistic programming language”, not “people”! Uncategorized Facebook Programming Languages MORE
Sometimes I look back on my life and wonder what it would have been like if I had never started programming. Obviously my career would be different, but I believe that programming has fundamentally changed how I think. Who I am as a person has changed significantly due to solving as many software problems as I have and the changes have been for the better. Teenage me was severely flawed MORE
Programming Related Topics DZone
AUGUST 14, 2020
This stack overflow graph of major programming languages’ growth exclusively depicts the steady progress of the PYTHON! Python programming language is better used for app development, web app or web development, game development, scientific computing, system administration, etc.
Dynatrace
SEPTEMBER 16, 2020
This is why we are excited to announce that Dynatrace has joined ServiceNow’s Service Graph Connector Program. The post Dynatrace joins ServiceNow Service Graph Connector Program appeared first on Dynatrace blog. Dynatrace news.
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Dynatrace
SEPTEMBER 22, 2020
Three years on from the introduction of the Dynatrace Partner Program, I’m excited to share with you a significant, evolutionary step in our P artner P rogram – the introduction of the Dynatrace Partner Competency Program. . Dynatrace news.
DZone
MAY 1, 2020
Introduction. Observability is the ability to understand the internal state of your system by looking at what is happening externally. In a software system, in order to acquire observability, we mainly implement the following aspects: logging, metrics, and tracing. Especially when we are moving away from monolithic software systems to microservices-based architectures, observability becomes a key aspect of the system design.
Dynatrace
OCTOBER 8, 2020
Before you begin, be sure to sign-up for the Preview program. Once you’ve received your invitation to the Preview program you need to: 1. How to participate in the Preview Program. Dynatrace news.
DZone
JULY 3, 2019
python programming scaling performaceAs a programmer we have written codes that ideally solves a problem, but do we take note of the performance when it comes to solving a problem, or do we just feel comfortable with “My code works?" " Don’t stop there, take your thinking bigger than “My code works” to “Can my code solve a huge problem?” as this is where thinking on a performance level comes in.
DZone
DECEMBER 9, 2019
There is always a lot of uncertainty around which programming language to use when starting a new test automation project. You may also like: 10 Programming Languages You Should Know in 2019. java javascript ruby python c# test automation programming languages ui testingWhich language do you use for test automation? Should you go with the same language that the development team is using?
Dynatrace
JULY 2, 2019
We’ve recently joined forces with Hackerone , the industry leader in external bug bounty programs. Wait, what is a bug bounty program? According to Hackerone a bug bounty program is described as: A program where ethical hackers are invited to report security vulnerabilities to organizations, in exchange for monetary rewards for useful submissions. They can then browse for all public bug bounty programs to participate in. Dynatrace news.
The Morning Paper
OCTOBER 17, 2019
HackPPL: a universal probabilistic programming language Ai et al., The Hack programming language, as the authors proudly tell us, is “ a dominant web development language across large technology firms with over 100 million lines of production code.” I’m not sure how it should officially be pronounced, but I can tell you that PPL stands for “probabilistic programming language”, not “people”! Uncategorized Facebook Programming Languages
DZone
AUGUST 9, 2019
A few months ago, I claimed that naming is the hardest programming problem. The true hardest problem is one that impacts every developer at every skill level, across all programming languages, regardless of experience. It is equally applicable across all programming disciplines. The hardest problem in programming is this: performance tight coupling weak couplingI was wrong.
Tasktop
AUGUST 8, 2019
When we kicked off our user research program, our goal was to generate objective data to guide our UX decisions. While designing this program, our limited set of users was something we had to consider. To build momentum, we kicked off the program using internal stakeholders as our test subjects. The post Bootstrapping a Usability Testing Program appeared first on Tasktop Blog.
Professor Beekums
JANUARY 14, 2017
A lot of attention is given to programming languages. Does it really matter what programming languages you know though? Many companies list positions such as “PHP Developer” or “Java Programmer”. Those interested in learning how to code often ask what language they should learn. Developers themselves argue over the merits of various languages. There are a growing number of people, including myself, that don’t take known languages into account when hiring
ScaleOut Software
SEPTEMBER 20, 2018
Digital twin models for stateful stream-processing have evolved from concepts largely unrelated to object-oriented programming, in particular, product life-cycle management and industrial IoT (where they are often called device twins ). The post Object-Oriented Programming Simplifies Digital Twins appeared first on ScaleOut Software. These are exciting times in the evolution of stream-processing.
Tasktop
OCTOBER 12, 2020
If your customers don’t know what’s slowing them down, or why their Agile and DevOps transformations are hitting a wall, then the Flow Partner Program is for you. About the Flow Partner Program. Key Program Highlights. Get Involved with the Flow Partner Program.
The Morning Paper
FEBRUARY 13, 2020
Programs, life cycles, and laws of software evolution , Lehman, Proc. For more than two decades, however, the programming fraternity, and through them the computer-user community, has faced serious problems achieving this. On programming, projects, and products. All change beyond the first version of the program is grouped by Lehman under the term maintenance. Programs must be made more alterable , and the alterability maintained throughout their lifetime.
O'Reilly Software
FEBRUARY 5, 2019
Tamar Eilam offers an overview of cloud-native programming and outlines a path toward the unification of the cloud programming model. Continue reading The future of cloud-native programming
ScaleOut Software
SEPTEMBER 20, 2018
Digital twin models for stateful stream-processing have evolved from concepts largely unrelated to object-oriented programming, in particular, product life-cycle management and industrial IoT (where they are often called device twins ). Architecture Featured Performance Products Programming Techniques Technology data-parallel computing digital twin in-memory computing in-memory data grid object-oriented programming ScaleOut StreamServer stream processing
Professor Beekums
JANUARY 21, 2019
These things are also good to have in the tools we use to build software, especially programming languages. When we talk about UX, we often refer to the UX of the products we build and use. We want our products to be easy to use. Interactions should be quick. Mistakes should be easy to recover from. I’ve worked in a fair number of languages: Java for almost 15 years, PHP for 8, Javascript for 8, and dabbled in a few others like C# and Go
John McCalpin
MARCH 4, 2019
While working on the implementation of the MPI version of the STREAM benchmark, I realized that there were some subtleties in timing that could easily lead to inaccurate and/or misleading results. This post is a transcription of my notes as I looked at the issues… Primary requirement: I want a measure of wall clock time that is guaranteed to start before any rank does work and to end after all ranks have finished their work.
Professor Beekums
NOVEMBER 19, 2016
Sometimes I look back on my life and wonder what it would have been like if I had never started programming. Obviously my career would be different, but I believe that programming has fundamentally changed how I think. Who I am as a person has changed significantly due to solving as many software problems as I have and the changes have been for the better. Teenage me was severely flawed
DZone
JUNE 1, 2020
I recently found myself explaining the concept of thread and thread pools to my team. We encountered a complicated threads-problem at our production environment that led us to review and analyze some legacy code. Although it threw me back to the basics, it was beneficial to review.NET capabilities and features in managing threads, which mainly reflected how.NET evolved significantly throughout the years.
PDC
FEBRUARY 13, 2019
Parallel programming solves big numerical problems by dividing them into smaller sub-tasks, and hence reduces the overall computational time on multi-processor and/or multi-core machines. Parallel programming is well supported in traditional programming languages like C and FORTRAN, which are suitable for “heavy-duty” computational tasks. In serial programming we can use the following code to compute and print the result, via list comprehension.
PDC
AUGUST 2, 2019
In previous posts we have introduced the multiprocessing module which makes it possible to parallelize Python programs on shared memory systems. This module provides an object-oriented interface that resembles the message passing interface (MPI) , and hence allows Python programs to exploit multiple processors on multiple compute nodes. Now we can write our first Python program with mpi4py.
PDC
NOVEMBER 6, 2019
In part 1 of this post , we introduced the mpi4py module (MPI for Python) which provides an object-oriented interface for Python resembling the message passing interface (MPI) and enables Python programs to exploit multiple processors on multiple compute nodes. As we mentioned in part 1 of this post , collective communication methods are very useful in parallel programming.
DZone
SEPTEMBER 21, 2020
Want your Go programs to run faster? programming go golang programming examples golang app developmentOptimizing string comparisons in Go can improve your application’s response time and help scalability.
PDC
MARCH 8, 2019
In the previous post we introduced the Pool class of the multiprocessing module. In this post we continue on and introduce the Process class , which makes it possible to have direct control over individual processes. A process can be created by providing a target function and its input arguments to the Process constructor. The process can then be started with the start method and ended using the join method. Below is a very simple example that prints the square of a number.
Sutter's Mill
OCTOBER 16, 2011
As a tribute in honor of Dennis Ritchie’s passing , I’d like to invite you to share your thoughts in this post’s comments about your first C program – either the code if you remember it approximately, or a story about when you wrote it. I wrote my first C program in 1988 as a lab assignment for a fourth-year course in computer graphics at the University of Waterloo.
DZone
SEPTEMBER 8, 2020
tutorial performance api test automation api testing testing and qa application programming interface testing as a service testing tutorial api testNowadays API testing is an integral part of testing. There are a lot of tools like postman, insomnia, etc.
All Things Distributed
JUNE 12, 2015
The Working Set Model for Program Behavior , Peter J. This weekend we go back in time all the way to the beginning of operating systems research. In the first SOSP conference in 1967 there were several papers that laid the foundation for the development of structured operating systems.
DZone
JULY 1, 2020
performance testing programming test automation developers automated testing automated testing best practices automated testing frameworksI'm a Developer Advocate and one of the things I love most about my role is that I travel all of over the world — meeting and consulting with engineering teams, and discussing the challenges that they face. One thing that I've realized about building quality software is.the struggle is real!
Tasktop
AUGUST 13, 2019
To address this problem, we devised a Usability Testing Program — which, as a smaller company — presented us with some interesting challenges. Challenge 1: Not enough dedicated resources available to run the Usability Testing Program. For our Usability Testing Program we faced two resource-based challenges: Ideally, we need one facilitator and at least one note-taker. Testing Tasktop Integration Hub ’s user experience is a rather complex undertaking.
ScaleOut Software
AUGUST 5, 2020
And how are they different from streaming pipelines like Azure Stream Analytics and Apache Flink/Beam? What Problems Does Streaming Analytics Solve?
Scalegrid
OCTOBER 7, 2019
The supported programming languages for PostgreSQL include.Net, C, C++, Delphi, Java, JavaScript (Node.js), Perl, PHP, Python and Tcl, but PostgreSQL can support many server-side procedural languages through its available extensions. We found that Java is the most popular programming language for PostgreSQL, being leveraged by 31.1% Python was the second most popular programming language used with PostgreSQL, coming in close at an average of 28.9%
DZone
MAY 28, 2020
Successfully programming an application requires an ingenious mix of lines of code that combine to bring life and versatility to the application. javascript tutorial performance programming performance optimizationYou’ll need to make several decisions while attempting to find solutions to a bigger set of problems.
ScaleOut Software
AUGUST 20, 2020
The mock development environment is shown below: Once a model has been created, it can be tested using a client test program that sends messages that simulate the behavior of one or more data sources. Simplifying the Development Process with Mock Environments.
ScaleOut Software
AUGUST 25, 2020
A Demo Application Shows How Companies Can Track COVID-19 Contacts Within Companies. Until a COVID-19 vaccine is widely available, getting back to work means keeping a close watch for outbreaks and quickly containing them when they occur.
ScaleOut Software
JULY 21, 2020
Architecture Featured Features Performance Products Programming Techniques Technology CRUD APIs data-parallel computing distributed caching high availability in-memory data grid object-oriented programming real-time analytics scalability
ScaleOut Software
JULY 21, 2020
Architecture Featured Features Performance Products Programming Techniques Technology CRUD APIs data-parallel computing distributed caching high availability in-memory data grid object-oriented programming real-time analytics scalability
DZone
JUNE 11, 2020
In this first half of the interview, the two covered: performance programming software testing test automation podcast software qualityIn these two Quality Sense episodes, host, Federico, delves into an entertaining and eye-opening discussion with Alan Richardson, a British consultant also known as “ Evil Tester.” With more than 25 years of experience in testing and development, he offers consultancy and training in agile testing and test automation.
The Netflix TechBlog
APRIL 29, 2019
Python has long been a popular programming language in the networking space because it’s an intuitive language that allows engineers to quickly solve networking problems. programming python netflixoss data-science netflixBy Pythonistas at Netflix, coordinated by Amjith Ramanujam and edited by Ellen Livengood As many of us prepare to go to PyCon, we wanted to share a sampling of how Python is used at Netflix.
DZone
AUGUST 6, 2019
tutorial performance integration docker java (programming lang The popularity of microservices and the use of third-party services for non-business critical features have drastically increased the number of integrations that make up the modern application. These days, it is commonplace to use MyS QL, Redis as a key-value store, MongoDB, Postgress, and InfluxDB — and that is all just for the database — let alone the multiple services that make up other parts of the application.
DZone
JANUARY 7, 2020
performance spring java (programming lang. Learn more about JUnit and Byteman! Testing asynchronous operations might cause some troubles and usually requires few challenges and also code changes (even in production code). In this article, we can find how to test such operations in an application that uses spring context (with asynchronous operations enabled). We don’t have to change the production code to achieve this. junit 4 asynchronous testing byteman script
DZone
SEPTEMBER 25, 2019
performance api memory cpu java (programming lang. What happens when you're out of memory? You may also like: Java Out of Memory Heap Analysis. Recently we experienced an interesting production problem. This application was running on multiple AWS EC2 instances behind Elastic Load Balancer. The application was running on a GNU/Linux OS, Java 8, Tomcat 8 application server. All of a sudden, one of the application instances became unresponsive.
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