computer measurement group, india 1 1 optimal design principles for better performance of next...

Computer Measurement Group, India 1Computer Measurement Group, India 1

www.cmgindia.org

Optimal Design Principles for better Performance of Next generation Systems

Balachandar Gurusamy, InfosysMaheshgopinath Mariappan, Infosys

Indranil Dharap, Infosys

http://www.cmgindia.org/

Computer Measurement Group, India 2Computer Measurement Group, India

Introduction• Design is the key in Software Engineering Methodology

• Design errors are difficult to address and will be very expensive to fix at a later stage


Programming Language


Selection of Database

• Big Data/No SQL will not solve all the data problems

• Problems faced due to wrong DB selection- Querying becomes complex- Query execution time will be very high and it results in slow responses to the user

• Case study – Trouble ticket application

• RDBMS for systems having relation among data and involves frequent reads

• NoSql for voluminous data without relation and less reads

ORA

CLES

QL

SE

RV

E

RH

A

D

O

OP


Replication strategies

Synchronous

Frequent updates

Slow response

Asynchronous

Less updates

Faster response


Caching

• Store only static data in the cache

• Implement proper cache eviction policies

• Use in-memory cache than secondary cache


Garbage collection• Garbage collection is a way of doing automatic memory

management• Case study – Queuing application dropping requests

- No issues in the system logs but application was dropping customer requests- Root cause analysis identified the issue related to bad garbage collection configuration

1 2 3 40

10

20

30

Dropped connection vs Full GC's

Full GC cycles(fixed time interval)Dropped connections


Session management• Session management is more like managing a transaction

• Every session started should be closed properly

• Case study – Ecommerce site not able to handle transactions- Lot of unmanaged customer session in memory- Session data is huge and consuming lot of system resources- Optimized configurations like, closing sessions once client is disconnected, timeout the session based on the application requirement, move data to temporary journal helps to address this issue


Client side computing vs Server side computing

Implemented using Javascript, Ajax , Flash

Implemented using PHP, ASP.net, JSP, Python, Ruby on rails

Interactive web applications Quick business rules computation

Less Network bandwidth Efficient caching implementation

Quicker initial load time Better data security

Preferred for dynamic loading of content, animations

Preferred for validating user preferences

Data storage in local temporary storage To develop structured web applications


Retry Mechanism

• Retry mechanism is used to enhance user experience

• It will be employed through Database calls and third party calls to cover the failures

• Case study – Real time communication project- No sql database is used in the project- When the database went down due to system issues, all the Clients

were retrying indefinitely and brought down the entire infrastructure - By configuring optimum number of retries the application works without

issues keeping the infrastructure issues away

1st Attempt- No response

2nd Attempt- No response

3rd Attempt- No response

No further attempts unless the protocol is followed


Choice of Design patterns• Currently more than 200 design patterns exist in the market• Design pattern Intent ontology is one of the method to

identify the suitable design pattern.• Design pattern wizard tool helps to select the appropriate

design pattern


Parallelism

1

23

4

• Identify the tasks that can be executed independently

• Break down large transaction into smaller tasks

• High throughput & better performance

• Map Reduce is the best example


Choice of data structures

Used by computers to store and retrieve data internally

Commonly used data types - List, Map, Set and Queue

List to retrieve items in the input order

Map for retrieving items based on the key

Set to store only unique set of data items

Queue to implement worker thread model

If possible override the default size of the data structure


Async transactions

Determine the transactions that can be done in asynchronous

manner

Helps to reuse expensive resources

effectively

Items that can be done asynchronously• Database read or

write• IO intensive

operations• Calls to third party

systems• Enable NIO

connections in the application servers


Avoid lot of hops

X


Thank You

computer measurement group, india 1 1 optimal design principles for better performance of next...

Documents