Welcome!

Blog Feed Post

Inside the black box Part 2 – Python

This is the second topic of the “Black Box” series, bringing us to Python. For people interested in Part One, generated code, please click here. In this post I’ll go through how to take a simple Python script and instrument it using the AppMon Native ADK. I will also shed some light on the most common pitfall when instrumenting Python scripts and how you might be able to work around it.

Let’s start with the example script. The code below is the complete script and while it isn’t doing much it will be able to show how to start the agent, how to create new PurePaths, how to capture function timings and arguments and more.

The handleRequest function is the entry point of the script and it prints out whatever argument you pass to it. It could be visualized as a web request handler, which is executed once with every web request. The handleRequest function calls the executeQuery function three times with different arguments, simulating a function executing database queries.

If we execute the above script, we get the following result printed out.

To instrument the above script we would first have to import the dynatrace library by calling import dynatrace at the top of the script. The dynatrace library is a Python wrapper which contains all the code needed for Python to communicate with the native ADK. The library is tested with Python 2.7 and 3.6 and can be downloaded from here.

The next step is to initialize the agent using dynatrace.init(). The initialization only needs to be executed once per process, so normally you would call that during the startup of the script. The init function will set up the connection to the AppMon collector and start monitoring the process. There is no need to call the uninitialized function at the end of the script, as the uninitialize function is registered by atexit, and will therefore be called automatically.

Within the dynatrace library there are a set of default values on line 19 to 24.

If you need to change any of these values, for example the name of the agent, you can either change the default value within the dynatrace library, or pass it as an argument to the init function.
dynatrace.init(agentName=“MyAgent”)

Once the agent is injected we will also need to add instrumentation into the code, for example to start PurePaths and capture functions. The two functions we will use for this is start_purepath and sensor. Both functions are contexts, so there is no need to call a function such as exit or end_purepath.

The start_purepath and sensor functions will not need to be passed information about the monitored function such as the function name, line number, file name and the arguments of the function. That is handled within the dynatrace library using inspect. If you don’t want to use the automatically captured information you can also pass your own values. If you, for example, would like to have a sensor with the name “mySensor” and the captured arguments “hello” and “world”, the function would look like this:
dynatrace.sensor(method=“mySensor”, params_to_capture=[“hello”, “world”])

This is how the script will look after we added the four lines.

By executing this script we receive the following PurePath in AppMon.

As you can see the instrumentation has automatically captured up the function names, arguments, CPU/IO breakdown and name of the file. By looking at the details of the top node we can see that it also recorded the line number and full path to the file.

One important note regarding the instrumentation is what happens when your application uses forks to spawn several processes. The Native ADK registers one agent per process, meaning that if you create a new process for each request you would have to initialize the agent on every request. As this does not scale well you should tweak the forking to spawn a new process only once every 10.000 or so requests (depending on the load).

Within the dynatrace library there are already functions created for linking the Python PurePath with PurePaths from other instrumented applications. The library is clear text and doesn’t require a separate compiler, so you can easily change the code if you need additional functions from the Native ADK.

Break open the black box and get in control of your applications, even if they are created in Python!

The post Inside the black box Part 2 – Python appeared first on Dynatrace blog – monitoring redefined.

Read the original blog entry...

More Stories By Dynatrace Blog

Building a revolutionary approach to software performance monitoring takes an extraordinary team. With decades of combined experience and an impressive history of disruptive innovation, that’s exactly what we ruxit has.

Get to know ruxit, and get to know the future of data analytics.

Latest Stories
For organizations that have amassed large sums of software complexity, taking a microservices approach is the first step toward DevOps and continuous improvement / development. Integrating system-level analysis with microservices makes it easier to change and add functionality to applications at any time without the increase of risk. Before you start big transformation projects or a cloud migration, make sure these changes won’t take down your entire organization.
SYS-CON Events announced today that Loom Systems will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Founded in 2015, Loom Systems delivers an advanced AI solution to predict and prevent problems in the digital business. Loom stands alone in the industry as an AI analysis platform requiring no prior math knowledge from operators, leveraging the existing staff to succeed in the digital era. With offices in S...
With billions of sensors deployed worldwide, the amount of machine-generated data will soon exceed what our networks can handle. But consumers and businesses will expect seamless experiences and real-time responsiveness. What does this mean for IoT devices and the infrastructure that supports them? More of the data will need to be handled at - or closer to - the devices themselves.
DevOps is often described as a combination of technology and culture. Without both, DevOps isn't complete. However, applying the culture to outdated technology is a recipe for disaster; as response times grow and connections between teams are delayed by technology, the culture will die. A Nutanix Enterprise Cloud has many benefits that provide the needed base for a true DevOps paradigm.
My team embarked on building a data lake for our sales and marketing data to better understand customer journeys. This required building a hybrid data pipeline to connect our cloud CRM with the new Hadoop Data Lake. One challenge is that IT was not in a position to provide support until we proved value and marketing did not have the experience, so we embarked on the journey ourselves within the product marketing team for our line of business within Progress. In his session at @BigDataExpo, Sum...
The taxi industry never saw Uber coming. Startups are a threat to incumbents like never before, and a major enabler for startups is that they are instantly “cloud ready.” If innovation moves at the pace of IT, then your company is in trouble. Why? Because your data center will not keep up with frenetic pace AWS, Microsoft and Google are rolling out new capabilities In his session at 20th Cloud Expo, Don Browning, VP of Cloud Architecture at Turner, will posit that disruption is inevitable for c...
SYS-CON Events announced today that Telecom Reseller has been named “Media Sponsor” of SYS-CON's 20th International Cloud Expo, which will take place on June 6–8, 2017, at the Javits Center in New York City, NY. Telecom Reseller reports on Unified Communications, UCaaS, BPaaS for enterprise and SMBs. They report extensively on both customer premises based solutions such as IP-PBX as well as cloud based and hosted platforms.
SYS-CON Events announced today that Ocean9will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Ocean9 provides cloud services for Backup, Disaster Recovery (DRaaS) and instant Innovation, and redefines enterprise infrastructure with its cloud native subscription offerings for mission critical SAP workloads.
Providing the needed data for application development and testing is a huge headache for most organizations. The problems are often the same across companies - speed, quality, cost, and control. Provisioning data can take days or weeks, every time a refresh is required. Using dummy data leads to quality problems. Creating physical copies of large data sets and sending them to distributed teams of developers eats up expensive storage and bandwidth resources. And, all of these copies proliferating...
In recent years, containers have taken the world by storm. Companies of all sizes and industries have realized the massive benefits of containers, such as unprecedented mobility, higher hardware utilization, and increased flexibility and agility; however, many containers today are non-persistent. Containers without persistence miss out on many benefits, and in many cases simply pass the responsibility of persistence onto other infrastructure, adding additional complexity.
SYS-CON Events announced today that Cloudistics, an on-premises cloud computing company, has been named “Bronze Sponsor” of SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Cloudistics delivers a complete public cloud experience with composable on-premises infrastructures to medium and large enterprises. Its software-defined technology natively converges network, storage, compute, virtualization, and management into a ...
DevOps is often described as a combination of technology and culture. Without both, DevOps isn't complete. However, applying the culture to outdated technology is a recipe for disaster; as response times grow and connections between teams are delayed by technology, the culture will die. A Nutanix Enterprise Cloud has many benefits that provide the needed base for a true DevOps paradigm. In his Day 3 Keynote at 20th Cloud Expo, Chris Brown, a Solutions Marketing Manager at Nutanix, will explore t...
SYS-CON Events announced today that CA Technologies has been named “Platinum Sponsor” of SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY, and the 21st International Cloud Expo®, which will take place October 31-November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. CA Technologies helps customers succeed in a future where every business – from apparel to energy – is being rewritten by software. From ...
Pentaho has announced orchestration capabilities that streamline the entire machine learning workflow and enable teams of data scientists, engineers and analysts to train, tune, test and deploy predictive models. Pentaho’s Data Integration and analytics platform ends the ‘gridlock’ associated with machine learning by enabling smooth team collaboration, maximizing limited data science resources and putting predictive models to work on big data faster – regardless of use case, industry, or languag...
SYS-CON Events announced today that T-Mobile will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. As America's Un-carrier, T-Mobile US, Inc., is redefining the way consumers and businesses buy wireless services through leading product and service innovation. The Company's advanced nationwide 4G LTE network delivers outstanding wireless experiences to 67.4 million customers who are unwilling to compromise on ...