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  1. #1
    Join Date
    Sep 2010

    malloc virtual memory

    When does malloc() return null ? I want to allocate a big virtual memory which can not possibly fit on RAM, so most of it will be stored on disk. I am going to access the data sequentially so at any one time the data I am working on will fit in RAM. So I am hoping the OS will help in moving the required pages in and out of disk. I can achieve this behavior manually by allocating the required blocks on RAM but this is rather tedious. Say I have an array a[100][10000000000]. At any one time I am working only on a[i-1][], a[i][], a[i+1][] which can fit in RAM but not the whole array. So how do I allocate the array so that I can work on it using for loops for(i=0;i<100;i++) without handling the page movements myself?

  2. #2
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
    Join Date
    Jan 2003
    Hanover Germany

    Re: malloc virtual memory

    Quote Originally Posted by dshawul View Post
    ... I have an array a[100][10000000000].
    Is it on a 64-bit system?
    Victor Nijegorodov

  3. #3
    Join Date
    Sep 2010

    Re: malloc virtual memory

    Yes with address space of 2^64.

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