FastMM in Depth - PowerPoint PPT Presentation
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FastMM in Depth
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FastMM in Depth Primo Gabrijel i , primoz_at_gabrijelcic.org www.thedelphigeek.com Memory Management Memory Management Do I really have to know anything about ... – PowerPoint PPT presentation
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Title: FastMM in Depth
1
FastMM in Depth
- Primož Gabrijelcic, primoz_at_gabrijelcic.org
- www.thedelphigeek.com
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Memory Management
3
Memory Management
- Do I really have to know anythingabout memory
management? - No!
- Unless you live in the real world ?
strings
handles
forms
windows
objects
brushes
http
files
4
Behind the Scene
- A simple program
- a 'The answer is'
- a a ' ' IntToStr(42)
- causes not so simple flow of events.
The answer is 42
The answer is
The answer is
42
5
Allocate, Release
- Allocate
- TClass.Create, GetMem, AllocateMem, New,
CreateWindow,Handle,File - Release
- object.Destroy/Free, FreeMem, Dispose,
CloseHandle - Or in Delphi terms Create, GetMem, AllocateMem
Destroy, Free, FreeMem - .NET is different
6
Memory Manager
- In the operating system
- In the runtime library
- Intermediary between the application and OS
- Speed
- Decreased fragmentation
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Bugs, Bugs, Everywhere
- Reading outside allocated area
- Writing outside allocated area
- Using released memory
The answer is 42
header
The answer is 42
header
header
data
Whats up Doc?
My memory block!
header
The answer is 42
My memory block!
Whats up Doc?
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FastMM 4
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FastMM4
- The Fastcode ProjectMemory Manager Challenge
- Pierre le Riche, fastmm.sourceforge.net
- Included in Delphi 2006
- Supports Delphi 4?, C Builder 4?, Kylix 3
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Delphi MM vs. FastMM4
Delphi MM FastMM4
Speed ? ??
Fragmentation ? ??
Debugging ? ??
Simplicity ? ??
- Uses FastMM4
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FastMM4 Internals
- Three memory managers in one
- Small blocks (lt 2,5 KB)
- Most frequently used (99)
- Medium blocks, subdivided into small blocks
- Medium blocks (2,5 260 KB)
- Allocated in chunks (1,25 MB) and subdivided into
lists - Large blocks (gt 260 KB)
- Allocated directly by the OS
- Separate locks
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Other Memory Managers
- TopMM
- www.topsoftwaresite.nl
- Multithreaded programming
- SafeMM
- cc.embarcadero.com/item/27241
- Debugging
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Show me the code!
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Q A
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