login vsi company logo login vsi company logo 250x40

Analyzing Login VSI Results

Analyzing Login VSI Results

What is the most important aspect of running Login VSI tests? The test results, of course! You can use the Login VSI Analyzer to know the maximum capacity of your environment and find specific performance bottlenecks. This video should help you better understand, interpret and analyze your first Login VSI tests.

The Login VSI Analyzer will automatically sort out the data collected during the test. It will calculate if the target environment has reached its saturation point and if so, at how many concurrent sessions. This point is called the VSImax and indicates at how many users your environment can support before they experience performance degradation.

Let’s look at an example. On a server running VMware ESX with 150 Windows 7 desktops running Office 2010, I have executed a test to figure out the VSImax. A bit more detail: These desktops were 32bit VMs with 2 virtual CPUs and 1GB of memory.

analyzing login vsi results vsimax 148

On the horizontal axis you see the number of active users and the vertical axis shows the response times in milliseconds. This graph also indicates to me that there are zero stuck sessions. If you see a lot of stuck sessions in your Login VSI test, it typically indicates something is wrong in the environment.

In this chart, the VSImax of 148 is the most important number. This tells me the system can tolerate 148 users before any of them would start to notice lacking performance (such as slow logon time).

Let’s check out another test I have executed on the same platform. The only thing I have changed in the environment is an upgrade from Microsoft Office 2010 to Microsoft Office 2013 so I can measure the impact of that change.

analyzing login vsi results vsimax 112

Right away, I spot that the maximum amount of users I can run on the platform has dropped by about 20% from 148 users to just 112 users. The only thing I changed in the environment was the version of Microsoft Office. This clearly shows why every change needs to be validated before bringing it to production.

To find out what exactly is causing this bottleneck, I can overlay performance data from different systems like logfiles from your storage device, perfmon results, XenServer or as in this example, ESXtop logfiles. As long as it is captured in a CSV file, you can overlay it. In this case, CPU is the bottleneck.

analyzing login vsi results external data

Another interesting metric is the baseline. This number indicates the performance of the system with little or no stress. A higher baseline indicates a slower performance in general, so it’s best to keep the baseline as low as possible. The baseline is typically influenced by storage, anti-virus software, workspace managers, and so on. The baseline is also used to calculate the threshold of the VSImax (this is the baseline + 1000 milliseconds).

If you have further questions regarding this post contact me using Twitter: @MarkPlettenberg or via support@loginvsi.com, by the way, what's your VSImax?

Ps. also make sure to watch this video for a technical introduction of Login VSI.

About the author

Mark Plettenberg (@markplettenberg) is a product manager of Login VSI and has played a critical role in the development and growth of Login VSI. Ask Mark about motorcycle mechanics and breaking/repairing anything and everything that has a power plug.


Tags: How-to, Login VSI, Videos, Best Practices, VSImax, Support

Popular Blogs

Windows Virtual Desktop - Update - December 2019

Windows Virtual Desktop Enhanced in the Latest Update

A lot has already been written about WVD in the last months. And while I had my initial concerns on this service many people are suggesting that they are willing to move to a platform like WVD in the next two years. Continue Reading
Login VSI - Press Release - Login VSI Releases Login Enterprise 4.0

[Press Release] Login VSI Releases Login Enterprise 4.0

Login VSI Releases Login Enterprise 4.0 New Application Load Testing Functionality Maximizes End-User Experience Continue Reading
Login VSI and Ymor Form Partnership to Deliver Performance Improvement to Business-Critical Applications

[Press Release] Login VSI and Ymor Form Partnership to Deliver Performance Improvement to Business-Critical Applications

The partnership offers a total solution for enterprise organizations to monitor and test business-critical applications from end-to-end via VDI or in the Cloud. Ymor offers various monitoring solutions, used to test and monitor the performance of critical business chains from end-to-end. In VDI environments, Ymor can now offer the monitoring solutions of Login VSI. Continue Reading
[Press Release] IGEL Expands Alliance with Login VSI; Integrates Login Enterprise into IGEL OS 11.03

[Press Release] IGEL Expands Alliance with Login VSI

Integrating Login Enterprise into IGEL OS 11.03 The combined solution enables IT organizations to leverage their IGEL infrastructure to continuously test the performance and availability of virtual and cloud workspaces. Continue Reading
Login VSI - Validating Your Remote Infrastructure at Scale - Man at Desk

Enabling Your Remote Workforce

Given recent global events, a majority of my users may need to work remotely. Many of our customers have been asking us if we can help them test the user-experience for their remote workforce, as well as the infrastructure that delivers it. We have seen requests range from the quality of the remote user-experience to the ability of their VPN to handle the throughput of a large volume of concurrent connections. Continue Reading
Login VSI Releases Login Enterprise 4.1

[Press Release] Login VSI Releases Login Enterprise 4.1

Login VSI Releases Login Enterprise 4.1 Comprehensive Testing Platform Ensures Business Continuity Continue Reading