The document provides guidance on developing reliable load test scripts and scenarios. It discusses test data requirements, parameterizing dynamic values, proper use of HTTP protocol versus GUI-level scripting, handling asynchronous requests, implementing think time and pacing, validating scripts, and best practices for load scenario configuration. The goal is to explore main points around scripting best practices, validating load scripts thoroughly, and configuration best practices to build effective performance tests.
Building of systems of automatic C/C++ code loggingPVS-Studio
Sometimes logging of an application's events is the only debugging method. The logging method's disadvantage is the large size of the code which you have to write manually to save the whole necessary information. The article touches upon the method allowing you to build a system of automatic logging of C/C++ code.
Writing and Testing JavaScript-heavy Web 2.0 apps with JSUnitAlex Chaffee
With the advent of the so-called Web 2.0 platform, more and more applications are using client-side JavaScript for vital features. In fact, some applications are so JS-heavy that they redefine JavaScript as a full-fledged application development language. In this tutorial we discuss some architectural considerations of JS- and AJAX-heavy applications and present in detail our testing framework, with plenty of code examples.
The Ultimate Question of Programming, Refactoring, and EverythingAndrey Karpov
Yes, you've guessed correctly - the answer is "42". In this article you will find 42 recommendations about coding in C++ that can help a programmer avoid a lot of errors, save time and effort. The author is Andrey Karpov - technical director of "Program Verification Systems", a team of developers, working on PVS-Studio static code analyzer. Having checked a large number of open source projects, we have seen a large variety of ways to shoot yourself in the foot; there is definitely much to share with the readers. Every recommendation is given with a practical example, which proves the currentness of this question. These tips are intended for C/C++ programmers, but usually they are universal, and may be of interest for developers using other languages.
The Ultimate Question of Programming, Refactoring, and EverythingPVS-Studio
Yes, you've guessed correctly - the answer is "42". In this article you will find 42 recommendations about coding in C++ that can help a programmer avoid a lot of errors, save time and effort. The author is Andrey Karpov - technical director of "Program Verification Systems", a team of developers, working on PVS-Studio static code analyzer. Having checked a large number of open source projects, we have seen a large variety of ways to shoot yourself in the foot; there is definitely much to share with the readers. Every recommendation is given with a practical example, which proves the currentness of this question. These tips are intended for C/C++ programmers, but usually they are universal, and may be of interest for developers using other languages.
Building of systems of automatic C/C++ code loggingPVS-Studio
Sometimes logging of an application's events is the only debugging method. The logging method's disadvantage is the large size of the code which you have to write manually to save the whole necessary information. The article touches upon the method allowing you to build a system of automatic logging of C/C++ code.
Writing and Testing JavaScript-heavy Web 2.0 apps with JSUnitAlex Chaffee
With the advent of the so-called Web 2.0 platform, more and more applications are using client-side JavaScript for vital features. In fact, some applications are so JS-heavy that they redefine JavaScript as a full-fledged application development language. In this tutorial we discuss some architectural considerations of JS- and AJAX-heavy applications and present in detail our testing framework, with plenty of code examples.
The Ultimate Question of Programming, Refactoring, and EverythingAndrey Karpov
Yes, you've guessed correctly - the answer is "42". In this article you will find 42 recommendations about coding in C++ that can help a programmer avoid a lot of errors, save time and effort. The author is Andrey Karpov - technical director of "Program Verification Systems", a team of developers, working on PVS-Studio static code analyzer. Having checked a large number of open source projects, we have seen a large variety of ways to shoot yourself in the foot; there is definitely much to share with the readers. Every recommendation is given with a practical example, which proves the currentness of this question. These tips are intended for C/C++ programmers, but usually they are universal, and may be of interest for developers using other languages.
The Ultimate Question of Programming, Refactoring, and EverythingPVS-Studio
Yes, you've guessed correctly - the answer is "42". In this article you will find 42 recommendations about coding in C++ that can help a programmer avoid a lot of errors, save time and effort. The author is Andrey Karpov - technical director of "Program Verification Systems", a team of developers, working on PVS-Studio static code analyzer. Having checked a large number of open source projects, we have seen a large variety of ways to shoot yourself in the foot; there is definitely much to share with the readers. Every recommendation is given with a practical example, which proves the currentness of this question. These tips are intended for C/C++ programmers, but usually they are universal, and may be of interest for developers using other languages.
Exception handling is always an important topic. This presentation will provide couple of good practices to deal with Errors & Exceptions happing in Node.js.
Keep those in mind, you will write a better code for a more stable software.
Happy Coding!
Http Parameter Pollution, a new category of web attacksStefano Di Paola
On May 14th @ OWASP Appsec Poland 2009, Stefano Di Paola (Minded Security) and Luca Carettoni presented a new attack category called
Http Parameter Pollution (HPP).
HPP attacks can be defined as the possibility to override or add HTTP GET/POST parameters by injecting query string
delimiters.
It affects a building block of all web technologies thus server-side and client-side attacks exist.
Exploiting HPP vulnerabilities, it may be possible to:
* Override existing hardcoded HTTP parameters.
* Modify the application behaviors.
* Access and, potentially exploit, uncontrollable variables.
* Bypass input validation checkpoints and WAFs rules.
Performance is the most important attribute for success of any commercial and Enterprise Software. In a client server environment, developers focus a lot on optimizing the Data and Logical Tiers. Optimization of Presentation Tier which is responsible for more than 30 % of performance is usually ignored.
The document is developed with the intension to teach the technical staff on Optimizing the Presentation Tier which significantly improves the performance of the Client Server applications.
Timely Year Two: Lessons Learned Building a Scalable Metrics Analytic SystemAccumulo Summit
Timely was born to visualize and analyze metric data at a scale untenable for existing solutions. We're returning to talk about what we've achieved over the past year, provide a detailed look into production architecture and discuss additional features added within the past year including alerting and support for external analytics.
– Speakers –
Drew Farris
Chief Technologist, Booz Allen Hamilton
Drew Farris is a software developer and technology consultant at Booz Allen Hamilton where he helps his client solve problems related to large scale analytics, distributed computing and machine learning. He is a member of the Apache Software Foundation and a contributing author to Manning Publications’ “Taming Text” and the Booz Allen Hamilton “Field Guide to Data Science”.
Bill Oley
Senior Lead Engineer, Booz Allen Hamilton
Bill Oley is a senior lead software engineer at Booz Allen Hamilton where he helps his clients analyze and solve problems related to large scale data ingest, storage, retrieval, and analysis. He is particularly interested in improving visibility into large scale systems by making actionable metrics scalable and usable. He has 16 years of experience designing and developing fault-tolerant distributed systems that operate on continuous streams of data. He holds a bachelor's degree in computer science from the United States Naval Academy and a master's degree in computer science from The Johns Hopkins University.
— More Information —
For more information see http://www.accumulosummit.com/
Exception handling is always an important topic. This presentation will provide couple of good practices to deal with Errors & Exceptions happing in Node.js.
Keep those in mind, you will write a better code for a more stable software.
Happy Coding!
Http Parameter Pollution, a new category of web attacksStefano Di Paola
On May 14th @ OWASP Appsec Poland 2009, Stefano Di Paola (Minded Security) and Luca Carettoni presented a new attack category called
Http Parameter Pollution (HPP).
HPP attacks can be defined as the possibility to override or add HTTP GET/POST parameters by injecting query string
delimiters.
It affects a building block of all web technologies thus server-side and client-side attacks exist.
Exploiting HPP vulnerabilities, it may be possible to:
* Override existing hardcoded HTTP parameters.
* Modify the application behaviors.
* Access and, potentially exploit, uncontrollable variables.
* Bypass input validation checkpoints and WAFs rules.
Performance is the most important attribute for success of any commercial and Enterprise Software. In a client server environment, developers focus a lot on optimizing the Data and Logical Tiers. Optimization of Presentation Tier which is responsible for more than 30 % of performance is usually ignored.
The document is developed with the intension to teach the technical staff on Optimizing the Presentation Tier which significantly improves the performance of the Client Server applications.
Timely Year Two: Lessons Learned Building a Scalable Metrics Analytic SystemAccumulo Summit
Timely was born to visualize and analyze metric data at a scale untenable for existing solutions. We're returning to talk about what we've achieved over the past year, provide a detailed look into production architecture and discuss additional features added within the past year including alerting and support for external analytics.
– Speakers –
Drew Farris
Chief Technologist, Booz Allen Hamilton
Drew Farris is a software developer and technology consultant at Booz Allen Hamilton where he helps his client solve problems related to large scale analytics, distributed computing and machine learning. He is a member of the Apache Software Foundation and a contributing author to Manning Publications’ “Taming Text” and the Booz Allen Hamilton “Field Guide to Data Science”.
Bill Oley
Senior Lead Engineer, Booz Allen Hamilton
Bill Oley is a senior lead software engineer at Booz Allen Hamilton where he helps his clients analyze and solve problems related to large scale data ingest, storage, retrieval, and analysis. He is particularly interested in improving visibility into large scale systems by making actionable metrics scalable and usable. He has 16 years of experience designing and developing fault-tolerant distributed systems that operate on continuous streams of data. He holds a bachelor's degree in computer science from the United States Naval Academy and a master's degree in computer science from The Johns Hopkins University.
— More Information —
For more information see http://www.accumulosummit.com/
BP101 - 10 Things to Consider when Developing & Deploying Applications in Lar...Martijn de Jong
Many common development techniques can cause dramatic effects when your application is rolled out over hundreds of servers. As a developer, you need a good understanding of certain parts of the infrastructure to build an application designed for wide-scale deployment. System administrators who review applications before deployment should know what to look for in the code to prevent problems when rolled out to production. This session takes a look at the area where Application Development and System Administration come together. You will hear about real-life problems, view examples of bad code as well as good code, and learn what you should consider when you have to develop or deploy an application which will be rolled out in a large-scale deployment, or how to "harden" your code to support large quantities of documents.
ASP.NET Best Practices - Useful Tips from the TrenchesHabeeb Rushdan
Slides from a presentation Habeeb Rushdan, MCT gave at the NoVa CodeCamp 2009.02 held at Microsoft Offices in Reston, VA on October 10, 2009. The session abstract follows:
This session will focus on some key ASP.NET web development best practices that are commonly overlooked. We will dig into ASP.NET from an Object Oriented Programming perspective and explore how this enables us to create easily maintainable and scalable applications. If you have a Classic ASP or web scripting background and have recently transitioned to ASP.NET or have been thinking about making the transition to ASP.NET, this session will get you started on the right path. Also, if you have been developing in ASP.NET for a while and are looking for some useful tips, be sure to stop by as well. I will pull from my years of experience as a software development consultant and MCT working with numerous development teams to help promote code that works as expected and is easily maintainable. This session will be geared towards ASP.NET WebForm development. Sorry ASP.NET MVC, due to presentation time limitations you couldn’t be included in the roster this time around.
BDD (Behavior-driven development), also known as ATDD (Acceptance test–driven development) is a software development process that helps Agile teams design, develop, test and deliver software efficiently, it's about how to implement agile acceptance testing and binding business requirements to code. BDD helps to bridge the communication gap between stakeholders and implementation teams, build quality into software from the start, design, develop and deliver systems fit for purpose. SpecFlow is the official tool to implement BDD on the .NET platform.
It's a very basic introduction of Load Runner for beginners, i explored it at my own, prepared slides & shared it with my colleagues.
What is Load Runner & why we need Performance testing etc.
Enjoy :)
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
Contact with Dawood Bhai Just call on +92322-6382012 and we'll help you. We'll solve all your problems within 12 to 24 hours and with 101% guarantee and with astrology systematic. If you want to take any personal or professional advice then also you can call us on +92322-6382012 , ONLINE LOVE PROBLEM & Other all types of Daily Life Problem's.Then CALL or WHATSAPP us on +92322-6382012 and Get all these problems solutions here by Amil Baba DAWOOD BANGALI
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Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Gen AI Study Jams _ For the GDSC Leads in India.pdf
PAC 2019 virtual Arjan Van Den Berg
1. Productive way of load test development
for any system using any tool
Arjan van den Berg
www.performancetestexpert.nl
2. Generic approach to develop reliable load
script(s) and scenario(s)
www.performancetestexpert.nl
3. Context presentation (1/2)
Presentation is focused on developing reliable HTTP protocol load scripts and scenarios
Advice when to script on Browser / GUI level
It’s related to performance test development & configuration so that my humble knowledge
and mistakes, from the past becomes knowledge for the future
…..a reliable load test script / scenario is crucial within every stage of the software
development cycle……and is often underestimated….
www.performancetestexpert.nl
5. To explore the following main points:
1. “Scripting best practices”, for developing load scripts
Test data needed for scripting,
Web (2.0) UI user interface
Introduction
Using HTTP protocol
Script on GUI-level
Web services scripting
2. How to validate a load scripts/scenario thoroughly.
3. Load script/scenario configuration best practices.
7. Test data (1/3)
Identify Test scenarios and get functional understanding (happy) test flow(s)
Identify test data for all Test scenarios
Unique user ID’s / accounts, sufficient to handle all load profiles !!
Create/Get production like test data
Of course we can also use mock/stubs, so responses are based on a given request
Creating test data for your load test is IMPORTANT
Test data should be “linked” to user ID, so that we know that each user “sees” is own
data….
8. Test data (2/3)
Examples:
#1 User has unique shopping articles , “correlated” to userID
#2 session replication , is session (data) handled correct under(high) load
#1 #2
9. Test data (3/3)
Testdata should be releated to userIds / Account.
So for instance don’t create a script like:
User A: Order a smart watch
User B: Order a smart watch
User C: Order a smart watch
But , like:
User A: Order a smart watch , shoes, <prod x>,
User B: Order a laptop, smartphone, <prod y>,
User C: Order a wireless mouse , <prod z>
10. Test data (3/3)
Releated to session data, an other example .
A user search action:
Usecase:
User A: Search for <birds>
User B: Search for <cars>
User C: Search for <product X>
Result:
User A: Search results for birds
User B: Search results for cars
User C: Search for <product X>
An example of what can happen in real life…
Usecase:
User A: Search for <birds>
User B: Search for <cars>
User C: Serach for <product X>
Result:
User A: Search results for cars
User B: Search results for birds
User C: Serach for <product X>
“Session
Data
issue””
11. Scripting best practices, for developing load scripts
Web (2.0) UI Interface
www.performancetestexpert.nl
12. Web (2.0 ) UI Interface - Introduction
A lot of GUI frameworks today Angular , React, …
Asynchronous website changes are common
Sometimes also a persistent , real time bi-directional web-socket channel is used…
Polling requests
A lot off java script client-side
You may think how to record this on http protocol level, but bottom-line still a get/post
request/response is used to communicate with the server so for technical reasons you have
rarely to use GUI-level scripting ….
13. Scripting best practices, for developing load scripts
Using HTTP protocol
www.performancetestexpert.nl
14. Web (2.0 ) UI Interface – HTTP Protocol
Start with simple user flows first
Make sure the script doesn’t record unneeded URLs / get / post requests
Identify ALL dynamic data (as the response from server) and correlate it !!
Recording scripts 2 times and compare in detail all request or use commercial tools
features
Get first the login session(Ids) / correlate the login sequence
Parameterize also all dynamic data; dates , GUIDs, (epoch) timestamps, …
Dynamic data is fetched with “expressions” from server response;
Some load test tools supporting xpath , jsonpath and so on…my personal flavor is
regular expressions (with grouping) to get the correct response into a parameter,
because this works always
15. Web (2.0 ) UI Interface – HTTP Protocol
Parameterize scripts to support dynamic data set.
Dynamic data, every simulated user get different data; avoids responses from cache …
Use also with a few transactions wrong test data values e.g.
wrong phone number format;
forget to fill an edit field; and so on…,
Test will be more realistic…else your test will be to clean…..
Use proper checks / assertions for all steps involved in the transaction.
Check on errors
Check also on expected results
Use also parameters for assertions, get also from test data table
Absence of assertions might result in misleading results….
16. Web (2.0 ) UI Interface – HTTP Protocol
Make sure that script can be executed against multiple environments
Users rarely log out , so don’t assume always “clean logout” and design scripts like that ..
Headers and cookies are handled automatically(almost) within any tool
Configure the think - and pacing time in the script.
Don’t use a constant think time value.
Distributing think time values in a range .(e.g 5 sec +/- 50%)
Implement think time and pacing time within your script with care, pay attention to
timing!!
Pacing is a must ! Sometimes not implemented at all….
17. Pacing in more detail
Think time and Pacing, both are a kind of “wait” or “delay” in terms of time but still both
differ from each other
Pacing can be the delay between two iterations of test
Responsetimealways 10 sec ?
What happens with TPS when response time is 5 sec ?
Yellow bar == pacing Time
So use pacing to get “steady” load
To compare load test results SUT, release x, y, z….. always use pacing!!
Thinktime + Round trip time <= Pacing !
18. Keep load scripts simple
Avoid custom flow logic within the script, it’s better to split it up into 2 separate
scripts
Don’t try to write custom error handling within the scripts, e.g. retry save
All tests scripts should be independent,
If data between scripts needs to be shared , use a temp file /queue which all
scripts can access
Avoid checks which not occur in real user scenario as much as possible , e.g
query with a script to check the database for “expected content”
19. Web (2.0 ) UI Interface – HTTP Protocol
Take Special attention to repeated / similar looking requests
• If repeated / intermittent requests are observed “like polling/heartbeat pattern”
• delete all except one and put this in a loop;
• use a variable extractor to check the state/response
Solution above can block the test flow, so if needed fork a separate thread
If you observe /expect asynchronously requests in your recorded script
Are maybe recorded sequential; but within a normal browser executed at the same
time
Check async requests, with browser developer tools, e.g In Chrome Network TAB, XHR
At least group such XMLHttpRequest together in your load script , or send them in
parallel
20. Web (2.0 ) UI Interface – HTTP Protocol
Anyhow, even if the requests are send synchronously within your load script , it will still
work (almost everytime), but is related to timings less accurate….
Pay attention to the transactions within your loadscript, should cover the right http
requests…
If a websocket channel is used…
Try to understand the (async) message patterns within this websocket channel
Measuring response times accurate, can be challenging
All requests/responses are send to one, channel, to take special attention to:
Assertions & Extracting parameters needs to be (extreme) generic
To get scripts up & running very often Multiple threads are needed,
Debug / Maintenance websocket based tests can be (very) difficult…
23. Scripting best practices, for developing load scripts
Script on GUI level
www.performancetestexpert.nl
24. Web (2.0 ) UI Interface – Script on GUI level
Scripting on GUI level remarks / some personal experiences
GUI level scripting is for sure not record and playback !
GUI level tests are used for backend loadtesting, frontend end-to-end user experience
testing is a different test !!
GUI Object identification needs also a learning curve/ gain experience with it..
GUI scripts also need maintenance…
Popup windows can be an issue
Assertions are also GUI objects, so needs attention !
Errors needs also to be identified as a GUI object
25. Web (2.0 ) UI Interface – Script on GUI level
Scripting on GUI level vs. HTTP
1. If possible use HTTP recording, and focus on fast script generation
Framework parameters in Neoload
Automatic correlation in other commercial tools
2. If the GUI is using Ajax “on average” still possible to use HTTP protocol
3. If the application is full websocket based, and the majority of the calls async. switch to
browser / GUI level
4. But to get GUI scripts stable takes also (development) time..
5. GUI Script flow is less technical, and more easy to explain to other stake holders
6. GUI script can reduce maintenance effort,
27. Webservices
Webservices script
Pretty straight forward
Often a subset of existing functional tests can be used / converted to a performance
test (work in this area close together with the functional testautomation engineer)
Use WSDL import within the load test tool, if possible, soapActions then available
Test also error paths; wrong data format in request (small percentage e.g. 1%)
Of course use assertions to check expected response
Use also response size check (in bytes) to check expected response
Importance of test data
Size message , large included attachments (Important for parsing, memory usage,
Database request(s),…)
Make sure that all operations / transformations are covered
Test security impact in a separate test
28. How to validate a load scripts/scenario thoroughly.
www.performancetestexpert.nl
29. Validate loadscript and scenario
Verify the scripts during design time
Validate with one iteration with one user
Validate with multiple iterations (#10) with one user
Validate with multiple iterations (#10) with multiple concurrent users (#10)
DONT START TOO QUICKLY WITH A FULL LOADTEST
30. Validate loadscript and scenario
Important best practices during validation script
Execute verification with full log in load test tool
Checking parameter/test data values during execution
Check response against recorded session
Check server logs during replay, or if possible check sessions in APM tools ; check
together with developers that what you see in the log is correct / valid
Check if pacing / think time works as expected
Check application server (e.g jvm) and resource usage SUT
If test with one user is already (very) slow, report a performance problem….
32. loadscenario
Load scenario configuration (1/2)
Group user scenarios / configurate the ratio between scripts
User standard naming conventions for the different load profiles e.g. Baseline, Stress,
Load, Spike test
Keep the settings for the load profiles fixed during the different test cycles, else you
loose the possibility to compare results…, because you have a lot of options there
Rampup time, ramp down, duration;
browser cache settings;
static content on/of;
rendezvous points;
Pacing time, Think time(s);
Option X,Y,Z
33. loadscenario
Load scenario configuration (2/2)
In case of (script) error, stop de Virtual user and start a new one,
To avoid collateral damage
If one step fails, there is a high risk that all other steps fail
Does not appy for webservices…
If possible make notes within the testrun results settings
what the run conditions are;
Even better automate this with a CI/CD pipeline
Store at least SUT software version(s);
And e.g Threadpool settings DB pool, log level SUT ,
34. A Quick Recap
Test data must be in place before developing load scripts and scenarios
Correlate unique test data to each user(ID) /session
Pay strong attention to any detail of your load script and scenario, you have to think of
more things than you initially aware of….
Use HTTP protocol if possible, until it appears that this becomes technically too complex,
then switch to GUI protocol
Automate the correlation , to detect dynamic values in the script , so you can replace
dynamic data automaticallywith parameters
until it appears that this becomes technically too complex
until it appears that this becomes technically too complex
www.performancetestexpert.nl
35. This is what you should have just learned
A Productive way of load test development
Building effective tests !
….And you are now aware of (all) pieces:
(session) testdata,HTTP protocol,GUI level scripting,dynamic
data , parameterization,correlation,web 2.0, (a) sync requests,
websockets,think time,pacing,
assertions,transactions,validating scripts, configure scenario
(best practices), ….