On Tue, 07 May 2013 19:09:28 -0400, Matic Kukovec
<matic.kuko...@pametnidom.si> wrote:
Hi
I'm running Windows Vista 64 with dmd 2.062.
I have a simple program:
import std.stdio, core.memory, std.cstream;
void main()
{
string[] temp_array;
for(int i=0;i<5000000;i++)
{
++temp_array.length;
temp_array[temp_array.length - 1] = "aaaaaaaaaaaaaaaaaaaaa";
This is very inefficient, use temp_array ~= "aaaaaaaaaaaaaaaaaaaaa";
}
temp_array = null;
GC.collect();
writeln("end");
din.getc();
}
When the program waits at "din.getc();", memory usage in the Task
Manager is 150MB.
Why isn't the memory deallocating?
The GC does not return free memory to the OS, just to free memory
pools/free-lists. GC.minimize may or may not help.
But your code may not have freed that memory anyway. It is not really
possible to ensure that temp_array isn't referred to. For example, the
compiler could keep temp_array in a register.
P.S.;
I tried temp_array.clear() and destroy(temp_array), but nothing changed.
Neither of these will deallocate memory. All are equivalent to setting
temp_array = null.
If you want to ensure deallocation, you need to free it using
GC.free(temp_array.ptr). A very dangerous operation, use with caution,
make sure there are no other references to that data.
-Steve
