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digitalmars.D.learn - Print RAM used by arrays

reply Giovanni Di Maria <calimero22 yahoo.it> writes:
Hi.
How can I know the amount of RAM allocated by a vector?

For example:

string[8][1000] array;
for(int i=0;i<1000;i++) {
    
array[i]=["1111","2222","3333","4444","5555","6666","7777","8888"];
}

how can I know the amount of bytes of above matrix?
Can I clean the memory ofter his use, without use GC?

Thank you to everybody

Giovanni Di Maria
Dec 13 2018
parent reply Steven Schveighoffer <schveiguy gmail.com> writes:
On 12/13/18 4:32 PM, Giovanni Di Maria wrote:
 Hi.
 How can I know the amount of RAM allocated by a vector?
 
 For example:
 
 string[8][1000] array;
 for(int i=0;i<1000;i++) {
 array[i]=["1111","2222","3333","4444","5555","6666","7777","8888"];
 }
 
 how can I know the amount of bytes of above matrix?
array.sizeof. BUT I would caution that you have used fixed-sized arrays so they will NOT be allocated on the heap, but rather on the stack (or thread-local storage if it's a global). For a variable-sized array, such as string[8][], the .sizeof property is always going to be 2 words. For that case, you need to use the GC to ask for the block size: writeln(GC.sizeof(array.ptr));
 Can I clean the memory ofter his use, without use GC?
It depends on where you put it. But generally D does not give back any memory to the OS unless asked to do so. But maybe that's not your question? -Steve
Dec 13 2018
parent Giovanni Di Maria <calimero22 yahoo.it> writes:
Thank you very much for your
precious informations.
Now i will try.
Thank you!!!
Giovanni
Dec 14 2018