A Day in the Life of an Application Performance Engineer Keith Lyon - Shunra Software

Introduction Who am I? What’s my background? How did I get introduced to Shunra?

Performance Testing Ecosystem Overview

A day in the life… My application is so slow… We take breaks between button clicks… What do you mean, did we “performance test”? Non-functional requirements? Network \ application profiling?

Why do we performance test? Determine speed or effectiveness of a computer, network, software program or device. Quantitative tests done in a lab, such as: –measuring the response time or the; –number of MIPS (millions of instructions per second) at which a system functions. Qualitative attributes such as: –reliability, scalability and interoperability may also be evaluated.

What are “non-functional” requirements? A requirement that specifies criteria that can be used to judge the operation of a system, rather than specific behaviors. For example: –Transactions per second; –CPU Utilization; –Memory Utilization; –Maximum Throughput.

Describe the “Performance” of a system Response Time: Typically defined as the time taken to complete a single business transaction. It is usually expressed in seconds. Throughput: Can be defined as the total number of business transactions completed by the application in unit time (per second or per hour). Resource Utilization: Different resources factored in, such as processor, disk (i/o controller), memory etc.

Performance Test Plan: What To Test 80/20 Rule Classify transactions Critical business processes

Performance Test Environment Capacity Scalability Node Deployment

Performance Test: Data Preparation Initial Data Setup Ongoing Data Retention Test Data

CPU Utilization vs. No. of users This graph tells us whether the CPU utilization increases with increasing users. It also tells us about bottlenecks as well as what is the maximum number of users that can be supported. Throughput vs. number of users This graph tells us if throughput increases with increasing number of users. This graph should have a similar shape as CPU Utilization graph. Value In Reporting

Performance Test: Best Practices Reusable Automated Core Scripts; Database backups after crucial runs; Designing scenarios to achieve right mix of transactions; Do not tune, if you don't have to.

Real Life Example: The Project… Custom Developed Application; Hosted by Third Party; Rolling Out to 250 International Sites; Time to Performance Test = 1 Month.

Network Model

Shunra Suite of Products and Hardware

Shunra Proprietary BeforeAfter Time-consuming coordination across remote sites Global testing conducted locally Fixed, permanent testing network Flexible testing from any location; “what-if testing” of latency, loss, bandwidth Maintaining remote load generators Emulating WAN in lab with shared infrastructure Testing only during network maintenance windows Testing is independent of production network

Shunra Professional Services

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