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What is the maximum size of acceptable data in the mmap function in c? [duplicate]

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1

This question already has an answer here:

• 
  How much memory could vm use
  
  2 answers
  
  

Let's suppose that there is a large file. The mmap function cannot handle it entirely. But we need to read as large parts of this file as possible.

I found that this command in Unix allows us to find the mmap size:

sysctl vm.max_map_count

The output is: vm.max_map_count = 65530.

However, it doesn't work in C program. How to find the size of map function in C program?

c linux unix memory-management mmap

share|improve this question

asked Mar 28 at 6:51

Marat SaidovMarat Saidov

1955 bronze badges

marked as duplicate by 4386427 c
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Mar 28 at 7:03

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Seems to me you have misunderstood the parameter. See stackoverflow.com/questions/11683850/…
  
  – 4386427
  Mar 28 at 7:00
  

  
  
  
  

add a comment | 

1

This question already has an answer here:

• 
  How much memory could vm use
  
  2 answers
  
  

Let's suppose that there is a large file. The mmap function cannot handle it entirely. But we need to read as large parts of this file as possible.

I found that this command in Unix allows us to find the mmap size:

sysctl vm.max_map_count

The output is: vm.max_map_count = 65530.

However, it doesn't work in C program. How to find the size of map function in C program?

c linux unix memory-management mmap

share|improve this question

asked Mar 28 at 6:51

Marat SaidovMarat Saidov

1955 bronze badges

marked as duplicate by 4386427 c
Users with the  c badge can single-handedly close c questions as duplicates and reopen them as needed.

StackExchange.ready(function()
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Mar 28 at 7:03

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Seems to me you have misunderstood the parameter. See stackoverflow.com/questions/11683850/…
  
  – 4386427
  Mar 28 at 7:00
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  How much memory could vm use
  
  2 answers
  
  

Let's suppose that there is a large file. The mmap function cannot handle it entirely. But we need to read as large parts of this file as possible.

I found that this command in Unix allows us to find the mmap size:

sysctl vm.max_map_count

The output is: vm.max_map_count = 65530.

However, it doesn't work in C program. How to find the size of map function in C program?

c linux unix memory-management mmap

share|improve this question

asked Mar 28 at 6:51

Marat SaidovMarat Saidov

1955 bronze badges

sysctl vm.max_map_count

share|improve this question

asked Mar 28 at 6:51

Marat SaidovMarat Saidov

1955 bronze badges

share|improve this question

asked Mar 28 at 6:51

Marat SaidovMarat Saidov

1955 bronze badges

asked Mar 28 at 6:51

Marat SaidovMarat Saidov

1955 bronze badges

asked Mar 28 at 6:51

Marat SaidovMarat Saidov

1955 bronze badges

1 Answer
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0

There is no limit on how big mmappings are (except for the bits in size_t), as the kernel never needs to load the entire thing into memory at once. mmap() is the method of choice for reading files larger than your memory: Just map the file, and let the kernel worry about the rest...

share|improve this answer

answered Mar 28 at 7:02

cmastercmaster

27.4k66 gold badges4242 silver badges8787 bronze badges

add a comment | 

0

There is no limit on how big mmappings are (except for the bits in size_t), as the kernel never needs to load the entire thing into memory at once. mmap() is the method of choice for reading files larger than your memory: Just map the file, and let the kernel worry about the rest...

share|improve this answer

answered Mar 28 at 7:02

cmastercmaster

27.4k66 gold badges4242 silver badges8787 bronze badges

add a comment | 

0

There is no limit on how big mmappings are (except for the bits in size_t), as the kernel never needs to load the entire thing into memory at once. mmap() is the method of choice for reading files larger than your memory: Just map the file, and let the kernel worry about the rest...

share|improve this answer

answered Mar 28 at 7:02

cmastercmaster

27.4k66 gold badges4242 silver badges8787 bronze badges

add a comment | 

There is no limit on how big mmappings are (except for the bits in size_t), as the kernel never needs to load the entire thing into memory at once. mmap() is the method of choice for reading files larger than your memory: Just map the file, and let the kernel worry about the rest...

share|improve this answer

answered Mar 28 at 7:02

cmastercmaster

27.4k66 gold badges4242 silver badges8787 bronze badges

share|improve this answer

answered Mar 28 at 7:02

cmastercmaster

27.4k66 gold badges4242 silver badges8787 bronze badges

answered Mar 28 at 7:02

cmastercmaster

27.4k66 gold badges4242 silver badges8787 bronze badges

answered Mar 28 at 7:02

cmastercmaster

27.4k66 gold badges4242 silver badges8787 bronze badges