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What’s more, the closest analog, Apache JMeter, is entirely free and easy to extend, thanks to open source code and a simple, understandable API for writing plugins. In current market conditions, when converting dollar prices to rubles, the cost of licenses for testing may exceed the value of the solution being tested. The most obvious is the product’s cost and complexity when expanding functionality.Īnyway, we’ve chosen a tool, so everything ought to work out, but now we count up the cost of the licenses. However, for all of its pluses there are minuses. This product recommends itself as massive and functional. Let’s returning to use Citrix protocol in Load Runner. Looking at JMeter, we see nothing, empty space, anguish, pain, and somebody’s forgotten broken crutches on an overgrown path through a forest that leads who knows where. It’s popularity is a result of the fact that there is no other choice. The most popular Citrix load testing tool for working is HP’s LoadRunner. But by no means can every loading tool work with this protocol. It’s no secret that Citrix has been used in performance testing protocols long enough to emulate user behavior on a client application. This lets us emulate not the behavior of the client application through replaying traffic, but rather the behavior of a large number of users of the client application. To tell the truth, we actually manage the applications through a terminal server. Unlike the first approach where the loading tool is “inserted” into the client-server link and parametrized traffic is used, here our tool sends commands to copies of the client application using the ICA protocol. The client application that end users interact with is published on a dedicated Citrix server (farm). What’s at the heart of Citrix performance testing? One way to handle this task is to use Citrix virtualization products, which may it possible to gain remote access to an application on almost any device. What can be done if you aren’t willing to expend so many resources on such lengthy investigations?Īt this point, an experienced load tester will, of course, say, “Hey, guys, try CITRIX!” Using Load Testing Citrix virtualization technologies Your results will be truly grand if you can overcome all of the “stumbling blocks”, but we in general we do not recommend this approach. Well, we can only salute those who choose this path and succeed. Of course, you still have to write a wrapper so it works correctly with the chosen loading tool. In our experience, it is not uncommon situation when a customer starts to think about load testing only one week before a scheduled release. Of course, you can use various traffic analyzers (Wireshark, TcpDump, and others), but the volume of traffic may be so large that you’ll need months to analyze it! But you may not even have access to the story (read: source code for the application’s client end).
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It’s like a TV show where the players being told the story before being asked what’s in the black box.
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In other words, the task is far from trivial and not always solvable. And if you also consider the time required and translate that to money, then the entire undertaking is very difficult to justify. But the likelihood of success is extremely small. You can try to figure out the protocol, decompile the application, reverse engineer it, and develop a plug-in or sampler based on the data received. But what do you do if the exchange between client and server uses a closed protocol or, even worse, a proprietary protocol, and the traffic cannot be recorded using standard tools?