Performance in .net best practices

Performance in .NET: Best practices
Sorin Oboroceanu, obs@rms.ro
Vlad Balan, bav@rms.ro
RomSoft, www.rms.ro
Iași, 8th of May 2010

Agenda
Why performance matters
Serialization
Reading XML
Garbage Collection
JITing

Everyone loves performance
Performance=money
Bing - 2 seconds slower – 4.3% drop in revenue
Google – 400ms slower – 0.6% drop in searches
Yahoo! – 400ms slower – 5-9% drop in full page traffic
Mozilla – 2.2 seconds faster – increased download conversion 15.4%
Site speed is now taken into account in search rankings

Better apps – Satisfied customers

Our Demo APP
Uses StackOverflow.com’s data
Groups users by location
Displays user locations in a chart
Will work in a client/server architecture
Has performance issues 

Collections
Groupping data
List<T>
LINQ to Objects
Dictionary<T,V>
DEMO

Client-Server communication
Retrieving all users on the client
Grouping data
List<T>
LINQ to Objects
Dictionary<T,V>
DEMO

Client-Server communication
Grouping data on the server
List<T>
LINQ to Objects
Dictionary<T,V>
Retrieving only location-related data on the client
DEMO

Reading XML
DataSet
XmlReader
LINQ to XML
XmlDocument
DEMO

Garbage Collection
Why memory matters
Garbage Collector
Object Finalization

Why memory matters
Inefficient use of memory can impact
Performance
Stability
Scalability
Other Applications
Hidden problems in code can cause
Memory Leaks
Excessive memory usage
Unnecessary performance overhead

.NET Memory Management
Small Object Heap (SOH) – Objects < 85K
Large Object Heap (LOH) – Objects => 85K

Small Object Heap (SOH)
GC
SmallObjectObjectA = new SmallObject();
SmallObjectObjectB = new SmallObject();
Global Objects
Small Object Heap
Next Object Pointer
ObjectE
Next Object Pointer
Stack
ObjectD
Static Objects
Next Object Pointer
ObjectC
Next Object Pointer
ObjectB
ObjectB
Next Object Pointer
ObjectA
Root Reference
ObjectA
Next Object Pointer
Child Reference

Generations
GC - Gen 0
GC - Gen 1
GC - Gen 2
Small Object Heap
Gen 0
Next Object Pointer
Global Objects
ObjectD
ObjectC
Next Object Pointer
Gen 1
Static Objects
Stack
ObjectB
Gen 2
Root Reference
ObjectA

Large Object Heap (LOH)
GC- Gen2
LargeObjectObjectD= new LargeObject();
Global Objects
Free space table
Large Object Heap
5727400
425000
16777216
ObjectD
94208
182272
Free space
Stack
ObjectC
ObjectC
ObjectB
Free space
ObjectB
ObjectA
ObjectA

Finalization
GC
Finalization Queue
FinObjectObjectE = new FinObject();
Small Object Heap
Gen 0
Global Objects
ObjectE
ObjectE
Finalize()
ObjectD
fReachable Queue
Finalizer thread
ObjectC
Stack
Gen 1
ObjectB
ObjectB
ObjectA
ObjectA

Finalization
public class Test { ~Test() { Cleanup (); } private void Cleanup() {// clean up unmanaged resources } }

Disposable pattern
public class Test : IDisposable{ ~Test() { Cleanup (false); } private void Cleanup(boolcodeDispose) { if (codeDispose) { // dispose managed resources } // clean up unmanaged resources } public void Dispose() { Cleanup (true); GC.SuppressFinalize(this); } }

JITing
Console
static void WriteLine();
static void WriteLine(string);
(remaining members)
Managed EXE
static void Main(){
Console.WriteLine(“Hello”);
Console.WriteLine(“GoodBye”);
}
JITCompiler
JITCompiler
MSCorEE.dll
…
JITCompiler function{
Look up the called method in the metadata
Get the IL for it from metadata
Allocate memory
Compile the IL into allocated memory
Modify the method’s entry in the Type’s table so it points to allocated memory
Jump to the native code contained inside the memory block.
}
Native CPU instr.

JITing
Console
static void WriteLine();
static void WriteLine(string);
(remaining members)
Managed EXE
static void Main(){
Console.WriteLine(“Hello”);
Console.WriteLine(“GoodBye”);
}
JITCompiler
Native
MSCorEE.dll
…
JITCompiler function{
Lookup the called method in the metadata
Get the IL for it from metadata
Allocate memory
Compile the IL into allocated memory
Modify the method’s entry in the Type’s table so it points to allocated memory
Jump to the native code contained inside the memory block.}
Native CPU instr.

Resources
CLR via C# 3, Jeffrey Richter
www.red-gate.com
www.stackoverflow.com

Please fill the evaluation formThank you very much!
Sorin Oboroceanu, obs@rms.ro
Vlad Balan, bav@rms.ro
RomSoft, www.rms.ro
Iași, 8th of May 2010

Performance in .net best practices

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Performance in .net best practices — Presentation Transcript