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B2conference performance 2004
1.
15-Nov-07
Introduction to Software Performance Engineering Blackboard Performance Center of Excellence Steve Feldman, Tim Moore and Ryan O’Neil perfeng@blackboard.com ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
2.
Any statements in
this presentation about future expectations, plans and prospects for the Company, including statements about the Company, the Building Blocks Program and other statements containing the words “believes,” “anticipates,” “plans,” “expects,” “will,” and similar expressions, constitute forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. Actual results may differ materially from those indicated by such forward-looking statements as a result of various important factors, including: product development, and other factors discussed in our Registration Statement filed on Form S-1 with the SEC. In addition, the forward- looking statements included in this press release represent the Company’s views as of July 26, 2004. The Company anticipates that subsequent events and developments will cause the Company’s views to change. However, while the Company may elect to update these forward-looking statements at some point in the future, the Company specifically disclaims any obligation to do so. These forward- looking statements should not be relied upon as representing the Company’s views as of any date subsequent to July 26, 2004. ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
3.
Read the Fine
Print Any statements in this presentation about future expectations, plans and prospects for the Company, including statements about the Company, the Building Blocks Program and other Any statements in this presentation about future expectations, plans and prospects for the Company, including statements about the Company, the Building Blocks Program and other statements containing the words “believes,” “anticipates,” “plans,” “expects,” “will,” and similar expressions, constitute forward-looking statements within the meaning of The Private Securities statements containing the words “believes,” “anticipates,” “plans,” “expects,” “will,” and similar expressions, constitute forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. Actual results may differ materially from those indicated by such forward-looking statements as a result of various important factors, including: product Litigation Reform Act of 1995. Actual results may differ materially from those indicated by such forward-looking statements as a result of various important factors, including: product development, and other factors discussed in our Registration Statement filed on Form S-1 with the SEC. In addition, the forward-looking statements included in this press release represent the development, and other factors discussed in our Registration Statement filed on Form S-1 with the SEC. In addition, the forward-looking statements included in this press release represent the Company’s views as of July 26, 2004. The Company anticipates that subsequent events and developments will cause the Company’s views to change. However, while the Company may elect Company’s views as of July 26, 2004. The Company anticipates that subsequent events and developments will cause the Company’s views to change. However, while the Company may elect to update these forward-looking statements at some point in the future, the Company specifically disclaims any obligation to do so. These forward-looking statements should not be relied upon to update these forward-looking statements at some point in the future, the Company specifically disclaims any obligation to do so. These forward-looking statements should not be relied upon as representing the Company’s views as of any date subsequent to July 26, 2004. as representing the Company’s views as of any date subsequent to July 26, 2004. ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
4.
Purpose of Today’s
Session Introduction to SPE (5 Minutes) SPE Methodology (15 Minutes) Applying SPE to Building Blocks (5 Minutes) Performance Analysis Tools and Techniques (5 Minutes) Demonstration of Building Block (10 minutes) Answer some questions… (10 minutes) ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
5.
Introduction to SPE Q:
What is software performance? A: Any characteristic of a software product that you could quantifiably measure? Q: Why is software performance important? A: The world we live in today is becoming more digitally sophisticated. We expect our digital transactions to be faster then our paper transactions. Q: How do we manage performance in the SDLC? A: Plan, Predict, Prove, Improve performance throughout the SDLC? ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
6.
Introduction to SPE
Performance is at the top of everyone’s mind. If Performance is poor, software adoption will decline and potentially cause usage attrition or adoption of alternative products/processes. Performance Failures cost institutions a large amount of unplanned money. Performance problems can create a huge trust barrier between user and provider of technology. So then what is SPE? ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
7.
Introduction to SPE SPE
is a methodology that… Provides a systematic, quantitative approach to constructing software systems that meet performance objectives. Provides a software-oriented approach to architecture, design and implementation choices. Prescribes principles and performance patterns for creating responsive software. Performance antipatterns for recognizing and correcting common problems, the data required for evaluation, procedures for obtaining performance specifications, and guidelines for the types of evaluation to be conducted at each development stage. ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
8.
SPE Methodology SPE is
a 7 Step Cyclical Process… Assess Performance Risk Identify Critical Use Cases Select Key Performance Scenarios Establish Performance Objectives Construct Performance Models Determine Software Resource Requirements Add System Resource Requirements ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
9.
SPE Methodology Assess Performance
Risk Distinguish between new development and refactor. Work with requirements specialists to understand the problem/domain issues for the work. Understand potential inter- versus intra-system integration. Apply common sense and basic business logic from past experiences and similar development projects. ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
10.
SPE Methodology Identify Critical
Use Cases Most important operations/actions in the feature or system. Responsiveness driven. Risk driven. You look for use cases where there is a risk that, if performance goals are not met, the system will fail or be less than successful. ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
11.
SPE Methodology Select Key
Performance Scenarios Unlikely that all critical use cases will be important to performance. The key performance scenarios are those that are executed frequently, or those that are critical to the perceived performance of the system. Each performance scenario corresponds to a workload. Performance scenarios represented through sequence diagrams augmented with some useful extensions. ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
12.
SPE Methodology Establish Performance
Objectives Identify and define performance objectives. Specify the quantitative criteria for evaluating the performance characteristics of the system under development. Response time, throughput, or constraints on resource usage Identify and define workload objectives. Specify the level of usage for the scenario. They are specified as an arrival rate (e.g., number of Web site hits per hour), number of concurrent users or number of parallel transactions. ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
13.
SPE Methodology Construct Performance
Models Use of Execution Graphs to represent software processing steps in the performance model. The sequence diagram representations of the key performance scenarios are translated into execution graphs. Reverse Engineer Reverse Engineer Reverse Engineer ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
14.
SPE Methodology Determine Software
Resource Requirements Understand at an atomic level the types of software resource requirements. Method Calls SQL Executions Data Loading Caching Understand the effects of this software to inter- and intra- system components. Understand at best- and worst-case perspective. 90% of the time Peak time. ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
15.
SPE Methodology Add System
Resource Requirements Apply Workload Understanding Based on findings in the software resource requirements phase you should be able to understand at an atomic level... CPU Cycles consumed by the method call and/or sql operation. Network overhead (packet transfer) Memory requirements Processing Thread/DB Connection Requirements ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
16.
Applying SPE to
Blocks We chose to create our own building block for this demo… Santa’s Little Helper B2 that provides performance/capacity metrics of sub-system usage within Blackboard. Parses an Apache access.log file Generate a graphical display of the following metrics – Sub-System Breakdown (Primary Graphical Requirement) – Hits Per Day in terms of Visits (Secondary Graphical Requirement) – Average Length Per Visit (Nice to Have Graphical Requirement) Generate a textual summary of the following metrics – Sub-System Breakdown (Primary Graphical Requirement) – Top 50 Click Paths (Primary Graphical Requirement) – Hits Per Day in terms of Visits (Secondary Graphical Requirement) – Average Length Per Visit (Nice to Have Graphical Requirement) ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
17.
Applying SPE to
Blocks SPE Phase Application of B2 to SPE Assess Performance Risk Relatively low use case, maybe executed by 1 person on a system a handful of times per day or week. No major database activity, performed in isolation on the application server. Identify Critical Use Cases 1. Textual Report (Default Report) of Sub-System Breakdown. 2. Textual Report of Hits Per Day. Select Key Performance Scenarios Limited only to administrator role access to this sub-system. Expected to be executed daily. Establish Performance Objectives 1. Ability to Parse up to 10mb in size. (Manage via a log rotation parameter) 2. 1mb file processed in 90 seconds. 3. Conversion of text into graphic 10 seconds or less. Construct Performance Models Sequence Diagram Attached Determine Software Resource Requirements Review Profiling Metrics Add System Resource Requirements Report from Grinder and Study System Resource Usage ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
18.
Applying SPE to
Blocks Example Sequence/Workflow Diagram ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
19.
SPE Tools and
Techniques Load Induced Tools for Simulation Java Profiling Interface to plug into the JVMPI API. SQL Profiler ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
20.
SPE Tools and
Techniques Load Induced Tools for Simulation Commercially Available Tools Mercury LoadRunner (Primary Tool of BB Perfeng) Seque Silk Performer Freeware Tools The Grinder (Primary Tool of BB Dev) Volano Countless others on Sourceforge ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
21.
SPE Tools and
Techniques Java Profilers Commercially Available Tools JProbe (Used by BB Perfeng) Performasure OptimizeIt Wily Enterprise Application Analyzer HyPerformix Freeware Tools HPJmeter JProbe Light (Used by BB Dev) Eclipse Profiler (Used by BB Dev) ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
22.
SPE Tools and
Techniques SQL Profilers Commercially Available Tools Hotsos (Used by BB Perfeng) IronEye SQL Freeware Tools Oracle SQL Analyze (Used by BB Perfeng and Dev) SQL Profiler for MS SQL Server (Used by BB Perfeng and Dev) ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
23.
Demonstration…
Here is our new Building Block ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
24.
Demonstration…
Click Here to Study Usage Statistics ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
25.
Demonstration…
Sub-Systems are Categorized and Distributed by Hits Total System Hits for the Day ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
26.
Demonstration… Contents of the
Grinder.Properties File grinder.processes=1 grinder.threads=10 grinder.runs=5 grinder.duration=0 grinder.script=tests/usage_analysis.py grinder.logDirectory=logs grinder.useConsole=false grinder.initialSleepTime=5000 grinder.sleepTimeFactor=1 grinder.sleepTimeVariation=1.0 grinder.logProcessStreams=true grinder.recordTime=true ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
27.
Demonstration…
Example Grinder .py file for Load Testing Santa’s Little Helper ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
28.
Demonstration…
Test Iterations Errors Mean Mean Response Response Transaction Transaction Response Bytes Per Errors Time (ms) Length Second Test 1 50 0 494.32 36565.00 NA 0 "My Institution" Test 2 50 0 2547.30 43182.00 NA 0 "Admin Panel" Test 3 50 0 106592.2 16566.94 NA 0 "Usage Stats" ©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
29.
Demonstration…
©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
30.
Demonstration…
©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
31.
Demonstration…
©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
32.
Demonstration…
©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
33.
Question and Answer…
©2004 BLACKBOARD, INC. ALL RIGHTS RESERVED.
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