Tag Archives: performance

Thoughts on using JMeter to do web performance testing

There are many tools to use for web performance testing, but if you want a good tool that does the job, I recommend Jmeter. The good and bad thing about JMeter is that there are alot of different options and features. To make it simpler for you, the good folks at Digital Ocean have a good tutorial on getting it set up, here: How To Use Apache JMeter To Perform Load Testing on a Web Server | DigitalOcean. While this is fine for testing one page, there are test scenarios where you want to have the user perform multiple steps (e.g. go to the home page, login to their account, check their account balance, then logout). If that is the case for you, too, then you want to read this next: How To Use JMeter To Record Test Scenarios | DigitalOcean (I used Firefox for this: if you are going to use JMeter to develop your performance test cases, then download Firefox too.) For any performance testing that follows a sequence, you really want to use the recording feature of JMeter.

Some other thoughts….

On my thread group, I added the following listeners:

  • Response time graph
  • Graph results
  • Aggregate report
  • View results tree (with scroll automatically on)

I also login to the web server and tail -f  the access log (and sometimes the error log).

I do all this because it is easy to run have a lot of errors when you first (and even later) run your test. For example, if you are testing a sequence, you might see good performance, but you might also see 404s in the access log, or you might see other anomalies in the aggregate report (e.g. good response 90% of the time, but bad response on average). Having more data is better and it insures you don’t have false positives (e.g., you think performance is good, but it really isn’t because the application is failing).

As soon as your developers have some code in place, have someone run Jmeter against it. Don’t wait until towards the end of the project. Jmeter is free and anyone can use it.

Back up your test plans often. It is easy to change your test plan, have it go from a successful one to an unsuccessful one because of the change, and then find it hard to go back because you changed a number of variables.

For your test plan, have multiple thread groups. This will allow you to test different test scenarios for different test groups. You can have different test plans too: it’s up to you how you manage it. For example, I recorded a long sequence for one test group, then I copied it and made a simple test group with less steps by removing them.

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29 IT links to things I am working on or interested in: AI, Python, Netscaler, automation and more

Things I am interested in or working on these days: AI, WebSphere setup, Python, Twitter programming, development in general, configuring Netscalers, cool things IBM is doing, automation, among other things.

  1. If you have the AI bug and think you want to do some Prolog programming, you need this: What Prolog implementation to choose? What’s fastest? Compatibility?
  2. Deep Learning is hot in AI. If you want more info, this is good: Deep Learning Tutorials — DeepLearning 0.1 documentation
  3. Sigh. This debate never goes away in AI: Why AlphaGo Is Not AI – IEEE Spectrum
  4. More on the hysteria that AI brings: The founder of Evernote made a great point about why AI (probably) won’t kill us all – Vox
  5. Ignore most AI hysteria, but do read this: What does it mean for an algorithm to be fair? | Math ∩ Programming
  6. Want to whip up a quick mobile app? Consider: Mobile App Builder – new service now available – Bluemix Blog
  7. For power users, there’s: How to create an insane multiple monitor setup with three, four, or more displays | PCWorld
  8. Need virtual images? Take a look at this: Images | VirtualBoxes – Free VirtualBox® Images
  9. For hardcore WAS users, this is helpful: Installing optional Java 7.x on WebSphere Application Server 8.5 (Application Integration Middleware Support Blog)
  10. A classic. Anyone tuning WAS needs this: Case study: Tuning WebSphere Application Server V7 and V8 for performance
  11. Want to learn Python? Write your own Twitter client? Or do both? Then there’s this: How To Build a Twitter “Hello World” Web App in Python | ProgrammableWeb
  12. More on programming Twitter: How To Use The Twitter API To Find Events | ProgrammableWeb
  13. Nice little project to try, here: Create a mobile-friendly to-do list app with PHP, jQuery Mobile, and Google Tasks
  14. Creating Simple Responsive HTML5 and PHP Contact Form | Future Tutorials
  15. Setting up a Linux system? Then you want to read this: Most secure way to partition linux? – Information Security Stack Exchange
  16. Want to learn Linux? This is essential! IBM developerWorks : Technical library concerning Learning Linux
  17. If you are doing performance work on Unix, you will likely use vmstat. Even if you know vmstat, this is good to review: What to look for in vmstat – UNIX vmstat command
  18. Wow! OS/2 is still alive! OS/2: Blue Lion to be the next distro of the 28-year-old – Yahoo Finance
  19. Talk about old tech! This makes OS/2 seem fresh! It’s Insane that New York’s Subway Still Runs on This 80-Year-Old Switchboard | Motherboard
  20. I was doing some work on Netscaler and found this useful in comparing the set up of one Netscaler config with another: Export Netscaler Config – NetScaler Application Delivery – Discussions. This is also useful:  Netscaler 9 Cheat Sheet.doc – netscaler9cheatsheet.pdf
  21. I thought this was a good development for everyone interested in Node: IBM Buys StrongLoop To Add Node.js API Development To Its Cloud Platform | TechCrunch
  22. Alot has changed with IBM’s OpenPOWER. Forbes gets you up to date, here: IBM’s OpenPOWER: A Lot Has Changed In Two Years – Forbes
  23. Cool stuff here: Access your Docker-based Raspberry Pi at home from the internet · Docker Pirates ARMed with explosive stuff
  24. I was using Perl scripts on Linux to send me messages to my mobile device via Pushover. This was good for that: pushover Archives – Perl Hacks
  25. I was also using WinSCP for that and this helped: Scripting and Task Automation :: WinSCP
  26. For all those trying to succeed in IT but feeling you are running into ceiling, you should read this: Tech’s Enduring Great-Man Myth or this When It Comes to Age Bias, Tech Companies Don’t Even Bother to Lie | Dan Lyons | LinkedIn
  27. Linus Torvalds is always interesting, and this is especially good: Linux at 25: Q&A With Linus Torvalds – IEEE Spectrum
  28. Very cool! Particle | Build your Internet of Things
  29. And finally some links to good stuff on UML online: Multi-layered web architecture UML package diagram example, web layer depends on business layer, which depends on data access layer and data transfer objects.

You wouldn’t go to work drunk: why are you going to work tired?

I ask that because as you can see from these charts, in terms of impairment, there is not much difference from showing up for work tired and showing up for work drunk:

Weirdly, if you do show up tired from overwork, you may be praised: if you show up drunk, you may be fired.

Regardless, to do good work, you need to sleep. (I know, I should practice what I preach.)

Julia Kirby in HBR has more on this in this piece: Change the World and Get to Bed by 10:00. You’ll be convinced to go to bed earlier by the time you finish it.

It’s Monday. Your Windows computer sucks. Here’s how to make it less sucky!

First, take this list: 25 tricks to make working with Windows faster, better and more fun.

Second, apply as many as you can. Even if you aren’t technically savvy or comfortable with changing things, look through the long list and find some you are comfortable with and apply them.

Third, ask for help with the ones you can’t do (either because you aren’t comfortable or their are restrictions regarding what you can change on your computer).

There! Your computer is better and less sucky already. And a less sucky computer means a less sucky work week.

Good luck! Thank me later! 🙂 Also thank ITBusiness, which is where I found it.

Hack: Facebook’s version of PHP, now for everyone (#technical)

It’s not news that Facebook has been running a modified version of PHP for some time. What is news is that now so can you.

You can get a copy of it at this website:Hack. It installs on most OSs (or will, soon), and even runs in the Cloud (on Heroku).

According to this, Facebook Introduces ‘Hack,’ the Programming Language of the Future | Wired Enterprise | Wired.com, what you get is a high performing version of PHP with very little you have to change to get the performance gains.

It will be interesting to see if this helps to drive up usage in PHP. There are lots of new technologies to build web site with these days: this could make PHP a desirable option.