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Software ecosystems form the heart of modern companies’ collaboration strategies with end users, open source developers and other companies. An ecosystem consists of a core platform and a halo of user contributions that provide value to a company or project. In order to sustain the level and number of high-quality contributions, it is crucial for companies and
contributors to understand how ecosystems tend to evolve and can be maintained successfully over time.
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http://sail.cs.queensu.ca/publications/pubs/German-CSMR2013.pdf
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The document summarizes the findings of a qualitative study comparing performance bugs to non-performance bugs in the Chrome and Firefox browsers. The study analyzed hundreds of bug reports to identify differences across four dimensions: impact on the user, context of the bug, discussion around fixing the bug, and the actual bug fix. The study found that performance bugs generally have a greater negative impact, are more complex to fix, require more discussion and collaboration, and are more likely to block software releases.
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Modern Release Engineering in a Nutshell - Why Researchers should Care!Bram Adams
Invited talk at the Leaders of Tomorrow Symposium of the 23rd IEEE International Conference on Software Analysis, Evolution, and Reengineering (SANER 2016).
The presentation (and its accompanying paper, see http://mcis.polymtl.ca/publications/2016/fose.pdf) explain the basics of release engineering pipelines, common challenges industry is facing as well as pitfalls software engineering researchers are falling into.
Speakers are Bram Adams (MCIS, http://mcis.polymtl.ca) and Shane McIntosh (McGill University, http://shanemcintosh.org).
A video-taped version of the talk will be available soon at https://www.youtube.com/channel/UCL8yG6qpHk7V66l1Jt3aZrA/featured.
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To detect integration errors as quickly as possible, organizations use automated build systems. Such systems ensure that (1) the developers are able to integrate their parts into an executable whole; (2) the testers are able to test the built system; (3) and the release engineers are able to leverage the generated build to produce the upcoming release. The flipside of automated builds is that any incorrect change can break the build, and hence testing and releasing, and (even worse) block other developers from continuing their work, delaying the project even further. To measure the impact of such build breakage, this empirical study analyzes 3,214 builds produced in a large software company over a period of 6 months. We found a high ratio of build breakage (17.9%), and also quantified the cost of such build breakage ranging from 904.64 to 2034.92 man-hours. Interviews with 28 software engineers from the company helped to understand the circumstances under which builds are broken and the effects of build breakages on the collaboration and coordination of teams. We quantitatively investigated the main factors impacting build breakage and found that build failures correlate with the number of simultaneous contributors on branches, the type of work items performed on a branch, and the roles played by the stakeholders of the builds (for example developers vs. integrators).
http://mcis.polymtl.ca/publications/2014/icsm14_noureddine.pdf
Is Multicore Hardware For General-Purpose Parallel Processing Broken? : NotesSubhajit Sahu
Highlighted notes of article while studying Concurrent Data Structures, CSE:
Is Multicore Hardware For General-Purpose Parallel Processing Broken?
By Uzi Vishkin
Communications of the ACM, April 2014, Vol. 57 No. 4, Pages 35-39
10.1145/2580945
An Empirical Study of Build System Migrations in Practice (ICSM 2012)Bram Adams
This document summarizes the key findings of a study on build system migrations in large open source projects. It identifies common migration methodologies, challenges, and lessons learned. Major contributions include identifying a spiral model for incremental migrations. Key challenges are requirements gathering, communication between roles, and balancing performance vs complexity. The study compares a failed migration (SCons for KDE) to a successful one (CMake for Linux kernel) to understand best practices for requirements elicitation, analysis, and stakeholder involvement.
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Software ecosystems form the heart of modern companies’ collaboration strategies with end users, open source developers and other companies. An ecosystem consists of a core platform and a halo of user contributions that provide value to a company or project. In order to sustain the level and number of high-quality contributions, it is crucial for companies and
contributors to understand how ecosystems tend to evolve and can be maintained successfully over time.
As a first step, this presentation explores the evolution characteristics of the statistical computing project GNU R, which is a successful, end-user programming ecosystem. We find that the ecosystem of user-contributed R packages has been growing steadily since R’s conception, at a significantly faster rate than core packages, yet each individual package remains stable in size. We also identified differences in the way user-contributed and core packages are able to attract an active community of users.
http://sail.cs.queensu.ca/publications/pubs/German-CSMR2013.pdf
A Qualitative Study on Performance Bugs (MSR 2012)Bram Adams
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Modern Release Engineering in a Nutshell - Why Researchers should Care!Bram Adams
Invited talk at the Leaders of Tomorrow Symposium of the 23rd IEEE International Conference on Software Analysis, Evolution, and Reengineering (SANER 2016).
The presentation (and its accompanying paper, see http://mcis.polymtl.ca/publications/2016/fose.pdf) explain the basics of release engineering pipelines, common challenges industry is facing as well as pitfalls software engineering researchers are falling into.
Speakers are Bram Adams (MCIS, http://mcis.polymtl.ca) and Shane McIntosh (McGill University, http://shanemcintosh.org).
A video-taped version of the talk will be available soon at https://www.youtube.com/channel/UCL8yG6qpHk7V66l1Jt3aZrA/featured.
Why do Automated Builds Break? An Empirical Study (ICSME 2014)Bram Adams
To detect integration errors as quickly as possible, organizations use automated build systems. Such systems ensure that (1) the developers are able to integrate their parts into an executable whole; (2) the testers are able to test the built system; (3) and the release engineers are able to leverage the generated build to produce the upcoming release. The flipside of automated builds is that any incorrect change can break the build, and hence testing and releasing, and (even worse) block other developers from continuing their work, delaying the project even further. To measure the impact of such build breakage, this empirical study analyzes 3,214 builds produced in a large software company over a period of 6 months. We found a high ratio of build breakage (17.9%), and also quantified the cost of such build breakage ranging from 904.64 to 2034.92 man-hours. Interviews with 28 software engineers from the company helped to understand the circumstances under which builds are broken and the effects of build breakages on the collaboration and coordination of teams. We quantitatively investigated the main factors impacting build breakage and found that build failures correlate with the number of simultaneous contributors on branches, the type of work items performed on a branch, and the roles played by the stakeholders of the builds (for example developers vs. integrators).
http://mcis.polymtl.ca/publications/2014/icsm14_noureddine.pdf
Is Multicore Hardware For General-Purpose Parallel Processing Broken? : NotesSubhajit Sahu
Highlighted notes of article while studying Concurrent Data Structures, CSE:
Is Multicore Hardware For General-Purpose Parallel Processing Broken?
By Uzi Vishkin
Communications of the ACM, April 2014, Vol. 57 No. 4, Pages 35-39
10.1145/2580945
How to save on software maintenance costsFrancisJansen
This document discusses ways to reduce software maintenance costs. It identifies several key drivers of high maintenance costs, including lack of documentation, complexity of code, volatility of requirements, and dispersed code changes. The document then presents six approaches to reducing costs: (1) creating or improving documentation, (2) eliminating dead code, (3) reducing cloned code, (4) avoiding and eliminating bugs, (5) focused testing on changed code only, and (6) reducing complexity. It advocates for an integrated approach called CARE (Computer Aided (Re)documentation & Evaluation) to systematically apply these cost-saving techniques.
FuzzyDbg is a debugger that integrates fuzzing and execution tracing functionality. It generates mutated inputs to test programs and identify crashes. When a crash occurs, it saves the crashing input and execution trace which details the functions triggered prior to the crash. This provides more information for analyzing crashes than a typical debugger. It aims to reduce performance overhead during tracing and provide a one-stop debugging solution.
JVM Support for Multitenant Applications - Steve Poole (IBM)jaxLondonConference
Presented at JAX London 2013
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Improving Software quality for the Modern WebEuan Garden
This document discusses the importance of software quality and testing. It provides examples of costly software bugs from systems like a US Navy ship and the Ariane 5 rocket to illustrate the importance of quality. The document also shares statistics on the high costs of defects and failed/overbudget projects. It promotes testing practices like unit testing, test automation, and exploring different types of testing like functional, load, security and more. Visuals are also provided to explain testing concepts and strategies to improve quality like reducing technical debt through automation.
1) Software maintenance costs have risen dramatically and now account for over 90% of total software costs, compared to around 50% a few decades ago. Understanding existing code, lack of documentation, volatile requirements, and dispersed code are some of the main cost drivers.
2) Ways to reduce maintenance costs include (re)documentation, which can save up to 12% of total costs, eliminating dead code which accounts for up to 30% of code size, and reducing cloned code which requires duplicate maintenance efforts.
3) Proper documentation, eliminating unused code, and refactoring duplicated code can significantly reduce the growing costs of software maintenance.
This document summarizes a Forrester Consulting study on the total economic impact of IBM's Worklight platform. Key findings include:
- Worklight decreases costs of developing, integrating, and maintaining multi-platform mobile apps compared to native environments. It allows code reuse and single-project multi-platform development and integration.
- Worklight provides cost savings over the life of an app through easier content maintenance, upgrades, and leveraging of internal resources rather than external developers.
- For the interviewed company, Worklight provided a 363% 5-year ROI and over $900,000 in net benefits for their first complex, 4-platform app. Ongoing additional apps provide higher returns due to sunk platform costs.
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Software project management involves several key steps: 1) Designing the project, 2) Documenting the design, 3) Repeating the design process. It also involves 4) Planning, controlling, and testing the project as well as 5) Involving users. Fixing problems after delivery can cost 100 times more than fixing them during early design phases. While compressing schedules by 25% is possible, adding people requires more overhead and training. For every $1 spent on development, $2 will be spent on maintenance, and maintenance costs can be higher for successful long-lived software products. Software costs are primarily determined by lines of code, and variations in individual productivity account for the largest differences in project
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This document provides a summary of Birendra Kumar's career objective, work experience, skills, and projects. He has over 7 years of experience as a senior software engineer working with multicast protocols, routing protocols, operating systems like AIX and Integrity RTOS. Some of his key projects include implementing PIM passive mode for multicast routing and developing logging and debugging infrastructure. He is proficient in C, C++, shell scripting, and has worked on tools like Git, Visual Studio, and ClearCase.
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This document discusses the impact of tangled code changes, where a single code change fixes bugs and implements new features. The key points are:
1) A study of 7,000 bug-fixing changes across 5 open-source projects found that on average, about 10% of bug fixes were tangled with other changes.
2) Untangling tangled changes allows more accurate measurement of their impact, such as which files are most defect-prone. Without untangling, up to 50% of files identified as most defect-prone could be false positives.
3) Tangled changes can incorrectly associate up to 16% of files with bug fixes, and up to 7% of files associated with bugs
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1. Ensuring the platform (hardware, virtualization software, etc.) can adequately support the application.
2. Ensuring the people and processes are in place to design, implement, operate and troubleshoot the virtualized application. This includes discussing skills, support models, change management and monitoring.
3. Reviewing the application itself and existing reference architectures to understand virtualization best practices and sizing for that application. The goal is to virtualize at the application layer rather than physical server layer.
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Prediction of Electrical Energy Efficiency Using Information on Consumer's Ac...PriyankaKilaniya
Energy efficiency has been important since the latter part of the last century. The main object of this survey is to determine the energy efficiency knowledge among consumers. Two separate districts in Bangladesh are selected to conduct the survey on households and showrooms about the energy and seller also. The survey uses the data to find some regression equations from which it is easy to predict energy efficiency knowledge. The data is analyzed and calculated based on five important criteria. The initial target was to find some factors that help predict a person's energy efficiency knowledge. From the survey, it is found that the energy efficiency awareness among the people of our country is very low. Relationships between household energy use behaviors are estimated using a unique dataset of about 40 households and 20 showrooms in Bangladesh's Chapainawabganj and Bagerhat districts. Knowledge of energy consumption and energy efficiency technology options is found to be associated with household use of energy conservation practices. Household characteristics also influence household energy use behavior. Younger household cohorts are more likely to adopt energy-efficient technologies and energy conservation practices and place primary importance on energy saving for environmental reasons. Education also influences attitudes toward energy conservation in Bangladesh. Low-education households indicate they primarily save electricity for the environment while high-education households indicate they are motivated by environmental concerns.
A high-Speed Communication System is based on the Design of a Bi-NoC Router, ...DharmaBanothu
The Network on Chip (NoC) has emerged as an effective
solution for intercommunication infrastructure within System on
Chip (SoC) designs, overcoming the limitations of traditional
methods that face significant bottlenecks. However, the complexity
of NoC design presents numerous challenges related to
performance metrics such as scalability, latency, power
consumption, and signal integrity. This project addresses the
issues within the router's memory unit and proposes an enhanced
memory structure. To achieve efficient data transfer, FIFO buffers
are implemented in distributed RAM and virtual channels for
FPGA-based NoC. The project introduces advanced FIFO-based
memory units within the NoC router, assessing their performance
in a Bi-directional NoC (Bi-NoC) configuration. The primary
objective is to reduce the router's workload while enhancing the
FIFO internal structure. To further improve data transfer speed,
a Bi-NoC with a self-configurable intercommunication channel is
suggested. Simulation and synthesis results demonstrate
guaranteed throughput, predictable latency, and equitable
network access, showing significant improvement over previous
designs
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This is an android application developed in Java and XML with the connectivity of
SQLite database. This application will provide most of basic functionality required for an
emergency time application. All the details of Blood banks and Blood donors are stored
in the database i.e. SQLite.
This application allowed the user to get all the information regarding blood banks and
blood donors such as Name, Number, Address, Blood Group, rather than searching it on
the different websites and wasting the precious time. This application is effective and
user friendly.
Determination of Equivalent Circuit parameters and performance characteristic...pvpriya2
Includes the testing of induction motor to draw the circle diagram of induction motor with step wise procedure and calculation for the same. Also explains the working and application of Induction generator
Accident detection system project report.pdfKamal Acharya
The Rapid growth of technology and infrastructure has made our lives easier. The
advent of technology has also increased the traffic hazards and the road accidents take place
frequently which causes huge loss of life and property because of the poor emergency facilities.
Many lives could have been saved if emergency service could get accident information and
reach in time. Our project will provide an optimum solution to this draw back. A piezo electric
sensor can be used as a crash or rollover detector of the vehicle during and after a crash. With
signals from a piezo electric sensor, a severe accident can be recognized. According to this
project when a vehicle meets with an accident immediately piezo electric sensor will detect the
signal or if a car rolls over. Then with the help of GSM module and GPS module, the location
will be sent to the emergency contact. Then after conforming the location necessary action will
be taken. If the person meets with a small accident or if there is no serious threat to anyone’s
life, then the alert message can be terminated by the driver by a switch provided in order to
avoid wasting the valuable time of the medical rescue team.
Tools & Techniques for Commissioning and Maintaining PV Systems W-Animations ...Transcat
Join us for this solutions-based webinar on the tools and techniques for commissioning and maintaining PV Systems. In this session, we'll review the process of building and maintaining a solar array, starting with installation and commissioning, then reviewing operations and maintenance of the system. This course will review insulation resistance testing, I-V curve testing, earth-bond continuity, ground resistance testing, performance tests, visual inspections, ground and arc fault testing procedures, and power quality analysis.
Fluke Solar Application Specialist Will White is presenting on this engaging topic:
Will has worked in the renewable energy industry since 2005, first as an installer for a small east coast solar integrator before adding sales, design, and project management to his skillset. In 2022, Will joined Fluke as a solar application specialist, where he supports their renewable energy testing equipment like IV-curve tracers, electrical meters, and thermal imaging cameras. Experienced in wind power, solar thermal, energy storage, and all scales of PV, Will has primarily focused on residential and small commercial systems. He is passionate about implementing high-quality, code-compliant installation techniques.
Sachpazis_Consolidation Settlement Calculation Program-The Python Code and th...Dr.Costas Sachpazis
Consolidation Settlement Calculation Program-The Python Code
By Professor Dr. Costas Sachpazis, Civil Engineer & Geologist
This program calculates the consolidation settlement for a foundation based on soil layer properties and foundation data. It allows users to input multiple soil layers and foundation characteristics to determine the total settlement.
Open Channel Flow: fluid flow with a free surfaceIndrajeet sahu
Open Channel Flow: This topic focuses on fluid flow with a free surface, such as in rivers, canals, and drainage ditches. Key concepts include the classification of flow types (steady vs. unsteady, uniform vs. non-uniform), hydraulic radius, flow resistance, Manning's equation, critical flow conditions, and energy and momentum principles. It also covers flow measurement techniques, gradually varied flow analysis, and the design of open channels. Understanding these principles is vital for effective water resource management and engineering applications.
3. Merge%cost% Update%cost% Maintain%cost% Remove%cost%
0.8%
4.5%
3.5%
2.7%
2.1%
4.4%
3%
5.5%
1.5%
Commit&2&
Text
Cost
Time
Audiobus and its Profile
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3
Easy to Merge, Hard to Synchronize!
6. Does it have external
dependencies?
How much effort
do I need to pay?
Is this integration
worth the effort?
What will this
integration change?
Will it cause
further risk?
.......
integrator
Panic Story of Integrator
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