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Can C# GC move memory objects

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8

Let's suppose this very basic C# code:

var tab = new int[10];

I have read that non fixed variables can be moved in memory by garbage collector.

My question is: Is it possible that "tab" address change during my program execution ?

I just want to understand.

In fact, no matter if tab value change.

c#

share|improve this question

edited Jul 4 at 18:37

casperOne

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asked Jul 4 at 8:06

Bob5421Bob5421

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• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Follow up question: why do you care? Just interested?
  
  – Blorgbeard
  Jul 4 at 16:36
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes, just interested
  
  – Bob5421
  Jul 4 at 16:37
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have never understood this sites mentality on questions like this? He mentions in the question that he just wanted to understand the underlying workings. But almost every answer still tells OP that it doesn't matter, he shouldn't care.
  
  – David Pilkington
  Jul 5 at 4:42
  

  
  
  
  

add a comment | 

8

Let's suppose this very basic C# code:

var tab = new int[10];

I have read that non fixed variables can be moved in memory by garbage collector.

My question is: Is it possible that "tab" address change during my program execution ?

I just want to understand.

In fact, no matter if tab value change.

c#

share|improve this question

edited Jul 4 at 18:37

casperOne

66.5k1414 gold badges161161 silver badges226226 bronze badges

asked Jul 4 at 8:06

Bob5421Bob5421

1,59133 gold badges2424 silver badges6363 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Follow up question: why do you care? Just interested?
  
  – Blorgbeard
  Jul 4 at 16:36
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes, just interested
  
  – Bob5421
  Jul 4 at 16:37
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have never understood this sites mentality on questions like this? He mentions in the question that he just wanted to understand the underlying workings. But almost every answer still tells OP that it doesn't matter, he shouldn't care.
  
  – David Pilkington
  Jul 5 at 4:42
  

  
  
  
  

add a comment | 

Let's suppose this very basic C# code:

var tab = new int[10];

I have read that non fixed variables can be moved in memory by garbage collector.

My question is: Is it possible that "tab" address change during my program execution ?

I just want to understand.

In fact, no matter if tab value change.

c#

share|improve this question

edited Jul 4 at 18:37

casperOne

66.5k1414 gold badges161161 silver badges226226 bronze badges

asked Jul 4 at 8:06

Bob5421Bob5421

1,59133 gold badges2424 silver badges6363 bronze badges

var tab = new int[10];

share|improve this question

edited Jul 4 at 18:37

casperOne

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asked Jul 4 at 8:06

Bob5421Bob5421

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share|improve this question

edited Jul 4 at 18:37

casperOne

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asked Jul 4 at 8:06

Bob5421Bob5421

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edited Jul 4 at 18:37

casperOne

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edited Jul 4 at 18:37

casperOne

66.5k1414 gold badges161161 silver badges226226 bronze badges

asked Jul 4 at 8:06

Bob5421Bob5421

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asked Jul 4 at 8:06

Bob5421Bob5421

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4 Answers
4

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8

Yes it will.

But you can use the fixed keyword to stop the GC from moving it if you so desire.

share|improve this answer

answered Jul 4 at 8:13

David PilkingtonDavid Pilkington

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add a comment | 

8

Yes. The memory address of tab can be (and most probably will be) changed. Reference: ECMA-334 C# Language Specification, chapter 23.4.

The point is, in c# you don't need to bother about memory addresses as it's a managed language. All references to tab variable will be changed accordingly, and your program will survive garbage collection seamlessly.

share|improve this answer

edited Jul 4 at 8:24

answered Jul 4 at 8:10

RenatRenat

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add a comment | 

2

It is certain that the array object could be moved in memory.

But note that you cannot obtain the pointer of a managed reference object, or you use a fixed block, it cannot be moved by GC within it.

If the array object is moved, the reference from variable tab to the array object is also fixed by GC, so there would be no way for you to see anything impacted by GC.

share|improve this answer

edited Jul 4 at 8:22

answered Jul 4 at 8:13

AlseinAlsein

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add a comment | 

1

Considering you are using var it means you are defining it in a method. Your variable lives in the context of that method for a very short time, and it is very unlikely that GC will move it.

On the other hand GC will move memory blocks to reduce memory fragmentation so yes it may move your variables. Best part of it you will not even notice it since it is same old "tab" for you.

If you want to be sure to fix location of that variable you can use "fixed".

share|improve this answer

answered Jul 4 at 8:14

edokanedokan

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add a comment | 

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8

Yes it will.

But you can use the fixed keyword to stop the GC from moving it if you so desire.

share|improve this answer

answered Jul 4 at 8:13

David PilkingtonDavid Pilkington

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add a comment | 

8

Yes it will.

But you can use the fixed keyword to stop the GC from moving it if you so desire.

share|improve this answer

answered Jul 4 at 8:13

David PilkingtonDavid Pilkington

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add a comment | 

Yes it will.

But you can use the fixed keyword to stop the GC from moving it if you so desire.

share|improve this answer

answered Jul 4 at 8:13

David PilkingtonDavid Pilkington

11.5k22 gold badges2727 silver badges5656 bronze badges

share|improve this answer

answered Jul 4 at 8:13

David PilkingtonDavid Pilkington

11.5k22 gold badges2727 silver badges5656 bronze badges

answered Jul 4 at 8:13

David PilkingtonDavid Pilkington

11.5k22 gold badges2727 silver badges5656 bronze badges

answered Jul 4 at 8:13

David PilkingtonDavid Pilkington

11.5k22 gold badges2727 silver badges5656 bronze badges

8

Yes. The memory address of tab can be (and most probably will be) changed. Reference: ECMA-334 C# Language Specification, chapter 23.4.

The point is, in c# you don't need to bother about memory addresses as it's a managed language. All references to tab variable will be changed accordingly, and your program will survive garbage collection seamlessly.

share|improve this answer

edited Jul 4 at 8:24

answered Jul 4 at 8:10

RenatRenat

2,14411 gold badge1111 silver badges2222 bronze badges

add a comment | 

8

Yes. The memory address of tab can be (and most probably will be) changed. Reference: ECMA-334 C# Language Specification, chapter 23.4.

The point is, in c# you don't need to bother about memory addresses as it's a managed language. All references to tab variable will be changed accordingly, and your program will survive garbage collection seamlessly.

share|improve this answer

edited Jul 4 at 8:24

answered Jul 4 at 8:10

RenatRenat

2,14411 gold badge1111 silver badges2222 bronze badges

add a comment | 

Yes. The memory address of tab can be (and most probably will be) changed. Reference: ECMA-334 C# Language Specification, chapter 23.4.

The point is, in c# you don't need to bother about memory addresses as it's a managed language. All references to tab variable will be changed accordingly, and your program will survive garbage collection seamlessly.

share|improve this answer

edited Jul 4 at 8:24

answered Jul 4 at 8:10

RenatRenat

2,14411 gold badge1111 silver badges2222 bronze badges

share|improve this answer

edited Jul 4 at 8:24

answered Jul 4 at 8:10

RenatRenat

2,14411 gold badge1111 silver badges2222 bronze badges

answered Jul 4 at 8:10

RenatRenat

2,14411 gold badge1111 silver badges2222 bronze badges

answered Jul 4 at 8:10

RenatRenat

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2

It is certain that the array object could be moved in memory.

But note that you cannot obtain the pointer of a managed reference object, or you use a fixed block, it cannot be moved by GC within it.

If the array object is moved, the reference from variable tab to the array object is also fixed by GC, so there would be no way for you to see anything impacted by GC.

share|improve this answer

edited Jul 4 at 8:22

answered Jul 4 at 8:13

AlseinAlsein

82811 silver badge1616 bronze badges

add a comment | 

2

It is certain that the array object could be moved in memory.

But note that you cannot obtain the pointer of a managed reference object, or you use a fixed block, it cannot be moved by GC within it.

If the array object is moved, the reference from variable tab to the array object is also fixed by GC, so there would be no way for you to see anything impacted by GC.

share|improve this answer

edited Jul 4 at 8:22

answered Jul 4 at 8:13

AlseinAlsein

82811 silver badge1616 bronze badges

add a comment | 

It is certain that the array object could be moved in memory.

But note that you cannot obtain the pointer of a managed reference object, or you use a fixed block, it cannot be moved by GC within it.

If the array object is moved, the reference from variable tab to the array object is also fixed by GC, so there would be no way for you to see anything impacted by GC.

share|improve this answer

edited Jul 4 at 8:22

answered Jul 4 at 8:13

AlseinAlsein

82811 silver badge1616 bronze badges

share|improve this answer

edited Jul 4 at 8:22

answered Jul 4 at 8:13

AlseinAlsein

82811 silver badge1616 bronze badges

answered Jul 4 at 8:13

AlseinAlsein

82811 silver badge1616 bronze badges

answered Jul 4 at 8:13

AlseinAlsein

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1

Considering you are using var it means you are defining it in a method. Your variable lives in the context of that method for a very short time, and it is very unlikely that GC will move it.

On the other hand GC will move memory blocks to reduce memory fragmentation so yes it may move your variables. Best part of it you will not even notice it since it is same old "tab" for you.

If you want to be sure to fix location of that variable you can use "fixed".

share|improve this answer

answered Jul 4 at 8:14

edokanedokan

3,2431616 silver badges3232 bronze badges

add a comment | 

1

Considering you are using var it means you are defining it in a method. Your variable lives in the context of that method for a very short time, and it is very unlikely that GC will move it.

On the other hand GC will move memory blocks to reduce memory fragmentation so yes it may move your variables. Best part of it you will not even notice it since it is same old "tab" for you.

If you want to be sure to fix location of that variable you can use "fixed".

share|improve this answer

answered Jul 4 at 8:14

edokanedokan

3,2431616 silver badges3232 bronze badges

add a comment | 

Considering you are using var it means you are defining it in a method. Your variable lives in the context of that method for a very short time, and it is very unlikely that GC will move it.

On the other hand GC will move memory blocks to reduce memory fragmentation so yes it may move your variables. Best part of it you will not even notice it since it is same old "tab" for you.

If you want to be sure to fix location of that variable you can use "fixed".

share|improve this answer

answered Jul 4 at 8:14

edokanedokan

3,2431616 silver badges3232 bronze badges

share|improve this answer

answered Jul 4 at 8:14

edokanedokan

3,2431616 silver badges3232 bronze badges

answered Jul 4 at 8:14

edokanedokan

3,2431616 silver badges3232 bronze badges

answered Jul 4 at 8:14

edokanedokan

3,2431616 silver badges3232 bronze badges