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ASP.NET Core 1.0 High Performance
ASP.NET Core 1.0 High Performance

ASP.NET Core 1.0 High Performance: Create fast, scalable, and high performance applications with C#, ASP.NET Core 1.0, and MVC 6

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Paperback Jun 2016 292 pages 1st Edition
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ASP.NET Core 1.0 High Performance

Chapter 2.  Measuring Performance Bottlenecks

Measurement is the most crucial aspect of building high performance systems. You can't change what you can't measure, because you won't know what effect your change has had, if any. Without measuring your application you won't know if it's performing well.

If you only go by when your software feels slow then you have left it too late. You are reactively fixing a problem rather than proactively avoiding one. You must measure to achieve good performance even though it's the feel that matters to a user.

Some books leave measurement, analysis, and profiling until the end. Yet this is the first thing that should be considered. It's easy to fix the wrong problem and optimize areas that are not having performance difficulties.

In this chapter we will cover the following topics.

  • Structured Query Language (SQL) database profiling
    • SQL Server Profiler
    • MiniProfiler
  • Web application profiling
    • Glimpse
    • Integrated Development...

Tools

Good debugging tools are essential in discovering where problems lie. You can write your own crude timing code and we will show you how. However, purpose built tools are much nicer to work with.

Many of the tools in this chapter help examine areas external to your code. We will cover profiling of code too, but it's hard to identify problems this way unless the work is purely computational. Slowdowns often happen because of actions your app initiates outside of its immediate stack, and these can be hard to debug by simply stepping through the code.

Moving through your program line-by-line slows down execution so much that it can be difficult to identify which lines are fast and which are slow. The same approach taken for fixing functional bugs cannot always be applied to fix performance issues.

One of the problems with adopting a new framework (such as ASP.NET Core) early is that it can take a while for the existing tools to be updated to work with it. We will point out when this...

Science

We dealt with the computer in computer science by showcasing some hardware in the previous chapter. Now, it's time for the science bit.

It's important to take a scientific approach if you wish to achieve consistently reliable results. Have a methodology or test plan and follow it the same way every time, only changing the thing that you want to measure. Automation can help a lot with this.

It's also important to always measure for your use case on your systems with your data. What worked well for someone else may not work out great for you.

We will talk more about science and statistics later in the book. Taking a simple average can be misleading but it's fine to use it as a gentle introduction. Read Chapter 8, The Downsides of Performance Enhancing Tools, for more on concepts such as medians and percentiles.

Repeatability

Results need to be repeatable. If you get wildly different results every time you test, then they can't be relied upon. You should repeat...

Summary

Let's sum up what we covered about measurement in this chapter and what we'll cover in the next chapter. We covered the importance of measurement in solving performance problems. Without measuring, you cannot hope to write high-performance software; you will be coding in the dark.

We highlighted some of the tools that you can use to measure performance. We showed you how to use a selection of these and how to write your own.

We also covered the value of taking a scientific approach to measurement. Making sure that your results are repeatable and that you record the correct units of measurement are important concerns.

In the next chapter, we will learn how to fix common performance problems. You will gain the skills to speed up the low-hanging fruit and make yourself look like a performance wizard to your colleagues. No longer will it be a case of it worked in test, it's an operations problem now.

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Key benefits

  • Learn the importance of measuring, profiling, and locating the most impactful problems
  • Discover the common areas you might encounter performance problems and areas you don’t need to worry about
  • Understand the differences between development workstations and production infrastructure and how these can amplify problems
  • Design workflows that run asynchronously and are resilient to transient performance issues

Description

ASP.NET Core is the new, open source, and cross-platform, web-application framework from Microsoft. It's a stripped down version of ASP.NET that's lightweight and fast. This book will show you how to make your web apps deliver high performance when using it. We'll address many performance improvement techniques from both a general web standpoint and from a C#, ASP.NET Core, and .NET Core perspective. This includes delving into the latest frameworks and demonstrating software design patterns that improve performance. We will highlight common performance pitfalls, which can often occur unnoticed on developer workstations, along with strategies to detect and resolve these issues early. By understanding and addressing challenges upfront, you can avoid nasty surprises when it comes to deployment time. We will introduce performance improvements along with the trade-offs that they entail. We will strike a balance between premature optimization and inefficient code by taking a scientific- and evidence-based approach. We'll remain pragmatic by focusing on the big problems. By reading this book, you'll learn what problems can occur when web applications are deployed at scale and know how to avoid or mitigate these issues. You'll gain experience of how to write high-performance applications without having to learn about issues the hard way. You'll see what's new in ASP.NET Core, why it's been rebuilt from the ground up, and what this means for performance. You will understand how you can now develop on and deploy to Windows, Mac OS X, and Linux using cross-platform tools, such as Visual Studio Code.

Who is this book for?

This book is for ASP.NET and C# developers who have experience with the MVC framework for web application development and are looking to deploy applications that will perform well in live production environments. These could be virtual machines or hosted by a cloud service provider such as AWS or Azure.

What you will learn

  • Why performance matters and when it should be considered
  • Use different tools to measure performance
  • Spot common performance issues, their root causes, and how to easily mitigate them
  • Improve performance at the network level and I/O level, and how to optimize the application as a whole
  • Work with caching and message queuing tools, including patterns and strategies
  • Discover the dark side of performance improvement and find out how to manage complexity
  • Monitor performance as part of continuous integration and regression testing
  • Assess and solve performance issues with other advanced technologies
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jun 27, 2016
Length: 292 pages
Edition : 1st
Language : English
ISBN-13 : 9781785881893
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Microsoft
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Product Details

Publication date : Jun 27, 2016
Length: 292 pages
Edition : 1st
Language : English
ISBN-13 : 9781785881893
Vendor :
Microsoft
Languages :

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Table of Contents

10 Chapters
1. Why Performance Is a Feature Chevron down icon Chevron up icon
2. Measuring Performance Bottlenecks Chevron down icon Chevron up icon
3. Fixing Common Performance Problems Chevron down icon Chevron up icon
4. Addressing Network Performance Chevron down icon Chevron up icon
5. Optimizing I/O Performance Chevron down icon Chevron up icon
6. Understanding Code Execution and Asynchronous Operations Chevron down icon Chevron up icon
7. Learning Caching and Message Queuing Chevron down icon Chevron up icon
8. The Downsides of Performance-Enhancing Tools Chevron down icon Chevron up icon
9. Monitoring Performance Regressions Chevron down icon Chevron up icon
10. The Way Ahead Chevron down icon Chevron up icon

Customer reviews

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Full star icon Half star icon Empty star icon Empty star icon Empty star icon 1.5
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2 star 50%
1 star 50%
Francisco Oct 10, 2016
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
Little specific information of .NET Core. It's more a general book.
Amazon Verified review Amazon
Amazon Customer Feb 18, 2017
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
I expected this to go deep into ASP.NET Core but book contains very general information about web applications and performance. Even worse all information is very shallow.
Amazon Verified review Amazon
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