How to get the size of memory at run time

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Hello
I have stored a bigbitmap.bmp in memory (assume its size 640x4800), I want to see part of it in k loop where k< X. In the loop when k=0 I will see the first part of the bigbitmap.bmp that totally fits (the part) my screen at 640x480 in this typical example the limit of the loop is k<10
i want to create the

bigbitmap.bmp

as big as i can the value X depends on the
the total free bytes available, most likley in the memory based on

X=Total_Bytes_Availabel/(640x480)

how could i find

Total_Bytes_Availabel ?

What I have tried:

Graphics g = pictureBox1.CreateGraphics();
     Rectangle SmallRect
     Bitmap SmallBitMap;
     Point p0_BigBitMap = new Point(1, 1);
     //X=Total_Bytes_Availabel/(640x480)
         for (k= 0;k< X;k++)
         {
             SmallRect = new Rectangle(p0_BigBitMap.X, p0_BigBitMap.Y, pictureBox1.Width , pictureBox1.Height);
             SmallBitMap = BigBitMap.Clone(SmallRect, BigBitMap.PixelFormat);
             g.DrawImage(SmallBitMap, p0_Picture);
             p0_BigBitMap.Y = p0_BigBitMap.Y + pictureBox1.Height;
         }

Posted 27-Jan-22 4:50am

Engineer khalid

Updated 28-Jan-22 1:27am

v14

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_Asif_ · Accepted Answer · 2022-01-28T01:27:00

Solution 1

System memory is a bit complex and virtual memories make it more complex.

For the start you can use below code to get Installed Memory. For my laptop it is showing 16 GB which is correct.

C#

var gcMemoryInfo = GC.GetGCMemoryInfo();
var installedMemory = gcMemoryInfo.TotalAvailableMemoryBytes;
// it will give the size of memory in MB
var physicalMemory = (double)installedMemory / 1048576.0;

You can get further details from below

How to get memory available or used in C# - Stack Overflow[^]

I was thinking of writing a bit detail over memory but then I found a great codeproject article that explains memory and their utilization in great length. You need to read the whole article with a cup of tea, will make your life easier.

Memory Limits in a .NET Process[^]

Posted 28-Jan-22 1:27am

_Asif_

Updated 29-Jan-22 2:32am

v3

Comments

Sean Ewington 28-Jan-22 7:57am

Thanks very much for your answer. While the link you've shared may be exactly the answer OP needs, we ask that answers be self-contained. The issue with links is that over time, they break. Using a link as a reference is fine, but we ask that the bulk of the answer be available here.

_Asif_ 28-Jan-22 9:11am

Acknowledged! I will update as soon as I get time

Engineer khalid 28-Jan-22 10:51am

MemoryStream memStream = new MemoryStream(X);
I guess I am looking for this value X.
may be some thing like memStream.bufferMaxSize

Engineer khalid 28-Jan-22 11:15am

i am not sure about this
static void Main()
{ int count;
long memBefore = GC.GetTotalMemory(true);
Console.WriteLine("memBefore = {0}\n", memBefore.ToString());
Console.ReadLine();
}
i get memBefore = 480384

Engineer khalid 28-Jan-22 11:40am

480384 is the size used
i should read more in memory,still waitting for help

_Asif_ 29-Jan-22 8:24am

Memory are far more complex then what it seems. For a quick start you can try this:
var gcMemoryInfo = GC.GetGCMemoryInfo();
var installedMemory = gcMemoryInfo.TotalAvailableMemoryBytes;
// it will give the size of memory in MB
var physicalMemory = (double)installedMemory / 1048576.0;

For my laptop it is returing 16 GB, but you have to understand that this 16 GB is not available to your application.

I thought of writing a bit detail over memory but I found this great article that explain Memory in great detail.

https://www.codeproject.com/Articles/483475/Memory-Limits-in-a-NET-Process