Friday, October 23, 2015

Windows 7 Update consumed high memory usage [FIXED]

Recently I received lots of complaints from end-user regarding their windows performance was very slow for an hour just after they logged into windows.

I found that the svchost.exe in the Task Manager consumed high resources, later I right click it, select "Go to Service(s)" and found that it's "wuauserv - Windows Update".

I have tried to download 3rd party apps to always set this process to the lowest resources priority. Unluckily it doesn't work well though.

After several months of search, I finally found a fix to this issue - Microsoft KB3065987. This hot fix requires a reboot to take effects. However, if you have WSUS - Windows Server Update Services, you need to perform another patch at the WSUS server - Microsoft KB2938066.

I hope this could saves you months of search :)

Wednesday, February 25, 2015

[Architecture]: Gang of Four (GoF) Design Patterns




The Gang of Four (GoF) patterns are generally considered the foundation for all other patterns. They are categorized in three groups: Creational, Structural, and Behavioral. Here you will find information on these important patterns.

Creational Patterns
· Abstract Factory Creates an instance of several families of classes
· Builder Separates object construction from its representation
· Factory Method Creates an instance of several derived classes
· Prototype A fully initialized instance to be copied or cloned
· Singleton A class of which only a single instance can exist

Structural Patterns
· Adapter Match interfaces of different classes
· Bridge Separates an object’s interface from its implementation
· Composite A tree structure of simple and composite objects
· Decorator Add responsibilities to objects dynamically
· Facade A single class that represents an entire subsystem
· Flyweight A fine-grained instance used for efficient sharing
· Proxy An object representing another object

Behavioral Patterns
· Chain of Resp. A way of passing a request between a chain of objects
· Command Encapsulate a command request as an object
· Interpreter A way to include language elements in a program
· Iterator Sequentially access the elements of a collection
· Mediator Defines simplified communication between classes
· Memento Capture and restore an object's internal state
· Observer A way of notifying change to a number of classes
· State Alter an object's behavior when its state changes
· Strategy Encapsulates an algorithm inside a class
· Template Method Defer the exact steps of an algorithm to a subclass
· Visitor Defines a new operation to a class without change