Supporting Incremental Changes in Large Models

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Supporting Incremental Changes in Large Models by Jannik Laval, Simon Denier, Stephane Ducasse and Andy Kellens, ESUG09, Brest, France.

Technology Business

SUPPORTING INCREMENTAL
CHANGES IN LARGE MODELS
Jannik Laval, Simon Denier, Stéphane Ducasse
RMod Team - INRIA

Andy Kellens
Software Languages Lab - VUB

ROADMAP
• Problem

• Different naive approaches

• copy

• delta

• lookup

• Our proposal

PROBLEM

• How to predict impact of changes ?

• How to predict and compare different
futures ?

• In large models.

EXAMPLE
• move mB1() in classA.

• remove classC.

Pack1 Pack1'

classA classA'
mA1() mA1'()
mA2() mA2'()
mB1'()
classB
mB1() classB'
mB2() mB2'()

classC

DIFFERENT NAIVE
APPROACHES

• Copy

• Delta

• LookUp

COPY
Model 1

Pack1

parentPackage
classC

classA
classB
parentClass
parentClass

mA1() mA2() mB1() mB2()

to from to from

anInvocation anInvocation

Model 2

Pack1'

parentPackage

classA'
classB'
parentClass
parentClass

mA1'() mA2'() mB1'() mB2'()

to from to from

anInvocation' anInvocation'

COPY
• Pros

• each version is complete

• easy to use and to transform

• Cons

• high creation time

• high memory usage

DELTA
Model 1

Pack1

parentPackage
classC

classA Model 2
classB
parentClass - removeLinkBetween: classB and: mB1()
parentClass - createLinkBetween: classA and: mB1()
- removeClass: classC

mA1() mA2() mB1() mB2()

to from to from

anInvocation anInvocation

DELTA

• Pros

• each version is represented by its changes

• fast to create a version

• Cons

• slow to access a version

Model 1
LOOKUP
Pack1

parentPackage
classC

classA
classB
parentClass
parentClass

mA1() mA2() mB1() mB2()

to from to from

anInvocation anInvocation

Model 2 LookUp

Pack1'

removedClass
C

classA'
classB'
parentClass

mB1'()

LOOKUP

• Pros

• only changed entities are copied

• Cons

• time for lookUp

• what about removed elements ?

LOOKUP Model 1

Pack1

parentPackage
classC

classA
classB
parentClass
parentClass

mA1() mA2() mB1() mB2()

to from to from

•a problem: anInvocation anInvocation

Model 2 LookUp

• mB2() parentClass ? Pack1'

removedClass
C

classA'
classB'
parentClass

mB1'()

PERFORMANCES
cost of cost of memory
Approach
creation access cost
copy ++++ 1 ++++
delta + ++++ +
lookUp + ++++ +

ORION APPROACH Model 1

Pack1

parentPackage
classC

classA
classB
parentClass
parentClass

• pointers approach mA1() mA2() mB1()

to
mB2()

to from from

anInvocation anInvocation

• access to updated elements
Model 2

Pack1'

• by an ID
classA'

• mB2() parentClass ?
classB'

mB1()'

ORION APPROACH
• Pros

• fastcreation and low memory usage: only
changed elements

• fast access: with the ID or pointers

• Cons

•a model depends on its predecessors

PERFORMANCES

Approach cost of cost of memory
creation access cost
copy ++++ 1 ++++
delta + ++++ +
lookUp + ++++ +
Orion + + +

ITS FUTURE

• Useit to make manual and automatic
prediction changes

• Comparing different changes

• Coupling with analysis tools (Famix)

THANKS

SUPPORTING INCREMENTAL CHANGES IN
LARGE MODELS

Jannik Laval, Simon Denier, Stéphane Ducasse
RMod Team - INRIA

Andy Kellens
Software Languages Lab - VUB

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Supporting Incremental Changes in Large Models

1. SUPPORTING INCREMENTAL CHANGES IN LARGE MODELS Jannik Laval, Simon Denier, Stéphane Ducasse RMod Team - INRIA Andy Kellens Software Languages Lab - VUB

2. ROADMAP • Problem • Different naive approaches • copy • delta • lookup • Our proposal

3. PROBLEM • How to predict impact of changes ? • How to predict and compare different futures ? • In large models.

4. EXAMPLE • move mB1() in classA. • remove classC. Pack1 Pack1' classA classA' mA1() mA1'() mA2() mA2'() mB1'() classB mB1() classB' mB2() mB2'() classC

5. DIFFERENT NAIVE APPROACHES • Copy • Delta • LookUp

6. COPY Model 1 Pack1 parentPackage classC classA classB parentClass parentClass mA1() mA2() mB1() mB2() to from to from anInvocation anInvocation Model 2 Pack1' parentPackage classA' classB' parentClass parentClass mA1'() mA2'() mB1'() mB2'() to from to from anInvocation' anInvocation'

7. COPY • Pros • each version is complete • easy to use and to transform • Cons • high creation time • high memory usage

8. DELTA Model 1 Pack1 parentPackage classC classA Model 2 classB parentClass - removeLinkBetween: classB and: mB1() parentClass - createLinkBetween: classA and: mB1() - removeClass: classC mA1() mA2() mB1() mB2() to from to from anInvocation anInvocation

9. DELTA • Pros • each version is represented by its changes • fast to create a version • Cons • slow to access a version

10. Model 1 LOOKUP Pack1 parentPackage classC classA classB parentClass parentClass mA1() mA2() mB1() mB2() to from to from anInvocation anInvocation Model 2 LookUp Pack1' removedClass C classA' classB' parentClass mB1'()

11. LOOKUP • Pros • only changed entities are copied • Cons • time for lookUp • what about removed elements ?

12. LOOKUP Model 1 Pack1 parentPackage classC classA classB parentClass parentClass mA1() mA2() mB1() mB2() to from to from •a problem: anInvocation anInvocation Model 2 LookUp • mB2() parentClass ? Pack1' removedClass C classA' classB' parentClass mB1'()

13. PERFORMANCES cost of cost of memory Approach creation access cost copy ++++ 1 ++++ delta + ++++ + lookUp + ++++ +

14. ORION APPROACH Model 1 Pack1 parentPackage classC classA classB parentClass parentClass • pointers approach mA1() mA2() mB1() to mB2() to from from anInvocation anInvocation • access to updated elements Model 2 Pack1' • by an ID classA' • mB2() parentClass ? classB' mB1()'

15. ORION APPROACH • Pros • fastcreation and low memory usage: only changed elements • fast access: with the ID or pointers • Cons •a model depends on its predecessors

16. PERFORMANCES Approach cost of cost of memory creation access cost copy ++++ 1 ++++ delta + ++++ + lookUp + ++++ + Orion + + +

17. ITS FUTURE • Useit to make manual and automatic prediction changes • Comparing different changes • Coupling with analysis tools (Famix)

18. THANKS SUPPORTING INCREMENTAL CHANGES IN LARGE MODELS Jannik Laval, Simon Denier, Stéphane Ducasse RMod Team - INRIA Andy Kellens Software Languages Lab - VUB

Supporting Incremental Changes in Large Models

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