digitalmars.D.learn - delete a dynamic array

tsalm (27/27) Oct 11 2008 Hello,

Chris R. Miller (2/38) Oct 11 2008 delete t;

tsalm (21/41) Oct 12 2008 It doesn't work too :-(

Michal Minich (6/37) Oct 12 2008 I had the same problem. It seems to me that Tango GC just doens't collec...

tsalm (20/52) Oct 12 2008 Not for me :(

Michal Minich (16/72) Oct 12 2008 Ok, here's the simplified version of code I used:

tsalm (10/77) Oct 12 2008 Oops, I didn't understand that GC free the memory for itself, and not fo...

tsalm <tsalm free.fr> writes:

Hello,

It's certainly a stupid question...

I want to delete an dynamic array of the memory.
I don't understand why the example above doesn't clear the memory uses b=
y  =

the array :

/* ------------------------------- */
import tango.time.Time;
import tango.io.Stdout;
import tango.stdc.stdio;
import tango.core.Memory;

void main()
{
  // Create a big array
  int[] t =3D new int[100000000];

  // delete the array
  t =3D null;

  // Clean the memory
  GC.collect();
  GC.minimize();

  // No, it's not free :-(
  Stdout("Now, the memory must be free...")();getchar;
}

/* ------------------------------- */

How can I totally clear this array of the memory ?

Thanks in advance,
TSalm

Oct 11 2008

"Chris R. Miller" <lordsauronthegreat gmail.com> writes:

tsalm wrote:
 Hello,
 
 It's certainly a stupid question...
 
 I want to delete an dynamic array of the memory.
 I don't understand why the example above doesn't clear the memory uses 
 by the array :
 
 /* ------------------------------- */
 import tango.time.Time;
 import tango.io.Stdout;
 import tango.stdc.stdio;
 import tango.core.Memory;
 
 void main()
 {
  // Create a big array
  int[] t = new int[100000000];
 
  // delete the array
  t = null;
 
  // Clean the memory
  GC.collect();
  GC.minimize();
 
  // No, it's not free :-(
  Stdout("Now, the memory must be free...")();getchar;
 }
 
 /* ------------------------------- */
 
 How can I totally clear this array of the memory ?
 
 Thanks in advance,
 TSalm

delete t;

Oct 11 2008

tsalm <tsalm free.fr> writes:

  /* ------------------------------- */
 import tango.time.Time;
 import tango.io.Stdout;
 import tango.stdc.stdio;
 import tango.core.Memory;
  void main()
 {
  // Create a big array
  int[] t =3D new int[100000000];
   // delete the array
  t =3D null;
   // Clean the memory
  GC.collect();
  GC.minimize();
   // No, it's not free :-(
  Stdout("Now, the memory must be free...")();getchar;
 }
  /* ------------------------------- */
  How can I totally clear this array of the memory ?


 delete t;

It doesn't work too :-(

Here is what I do (phobos version, tested on dmd.2.019) :
*/ -------------------------------- */
// import tango.io.Stdout;
// import tango.stdc.stdio;
import std.stdio;


// import tango.core.Memory;
import GC =3D std.gc ;


void main()
{
  // Create a big array
  int[] t =3D new int[100000000];

  // delete the array
  delete t;

  // Clean the memory
//  GC.collect();
  GC.fullCollect;
  GC.minimize();

  // No, it's not free :-(
  writeln("Now, the memory must be free...");getchar;
}

Oct 12 2008

Michal Minich <michal.minich gmail.com> writes:

Hello tsalm,

 Hello,
 
 It's certainly a stupid question...
 
 I want to delete an dynamic array of the memory.
 I don't understand why the example above doesn't clear the memory uses
 by
 the array :
 /* ------------------------------- */
 import tango.time.Time;
 import tango.io.Stdout;
 import tango.stdc.stdio;
 import tango.core.Memory;
 void main()
 {
 // Create a big array
 int[] t = new int[100000000];
 // delete the array
 t = null;
 // Clean the memory
 GC.collect();
 GC.minimize();
 // No, it's not free :-(
 Stdout("Now, the memory must be free...")();getchar;
 }
 /* ------------------------------- */
 
 How can I totally clear this array of the memory ?
 
 Thanks in advance,
 TSalm



I had the same problem. It seems to me that Tango GC just doens't collect 
dynamically allocated arrays! (But collects when you use t.lenght)

This worked for me:

import tango.core.Memory;

GC.free (t.ptr);

Oct 12 2008

tsalm <tsalm free.fr> writes:

  It's certainly a stupid question...
  I want to delete an dynamic array of the memory.
 I don't understand why the example above doesn't clear the memory use=


s
 by
 the array :
 /* ------------------------------- */
 import tango.time.Time;
 import tango.io.Stdout;
 import tango.stdc.stdio;
 import tango.core.Memory;
 void main()
 {
 // Create a big array
 int[] t =3D new int[100000000];
 // delete the array
 t =3D null;
 // Clean the memory
 GC.collect();
 GC.minimize();
 // No, it's not free :-(
 Stdout("Now, the memory must be free...")();getchar;
 }
 /* ------------------------------- */
  How can I totally clear this array of the memory ?
  Thanks in advance,
 TSalm



 I had the same problem. It seems to me that Tango GC just doens't  =

 collect dynamically allocated arrays! (But collects when you use  =

 t.lenght)

 This worked for me:

 import tango.core.Memory;

 GC.free (t.ptr);

Not for me :(
Here is my code :
/*---------------------------------------*/
import tango.io.Stdout;
import tango.stdc.stdio;
import tango.core.Memory;


void main()
{
  // Create a big array
  int[] t; // =3D new int[100000000];
  t.length =3D 100000000 ;

  // delete the array
  GC.free (t.ptr);

  // Clean the memory
  GC.collect();
  GC.minimize();

  // No, it's not free :-(
  Stdout("Now, the memory must be free...")();getchar;
}

Oct 12 2008

Michal Minich <michal.minich gmail.com> writes:

Hello tsalm,

 It's certainly a stupid question...
 I want to delete an dynamic array of the memory.
 I don't understand why the example above doesn't clear the memory
 uses
 by
 the array :
 /* ------------------------------- */
 import tango.time.Time;
 import tango.io.Stdout;
 import tango.stdc.stdio;
 import tango.core.Memory;
 void main()
 {
 // Create a big array
 int[] t = new int[100000000];
 // delete the array
 t = null;
 // Clean the memory
 GC.collect();
 GC.minimize();
 // No, it's not free :-(
 Stdout("Now, the memory must be free...")();getchar;
 }
 /* ------------------------------- */
 How can I totally clear this array of the memory ?
 Thanks in advance,
 TSalm

 I had the same problem. It seems to me that Tango GC just doens't
 collect dynamically allocated arrays! (But collects when you use
 t.lenght)
 
 This worked for me:
 
 import tango.core.Memory;
 
 GC.free (t.ptr);
 

 Not for me :(
 Here is my code :
 /*---------------------------------------*/
 import tango.io.Stdout;
 import tango.stdc.stdio;
 import tango.core.Memory;
 void main()
 {
 // Create a big array
 int[] t; // = new int[100000000];
 t.length = 100000000 ;
 // delete the array
 GC.free (t.ptr);
 // Clean the memory
 GC.collect();
 GC.minimize();
 // No, it's not free :-(
 Stdout("Now, the memory must be free...")();getchar;
 }

Ok, here's the simplified version of code I used:

class X {

  int[] t;

  void resize (int size) {

    GC.free (t.ptr);
    t = new int[size];
  }
}

void main () {

  X x = new X();
  x.resize (100000000);
  // do something
  x.resize (0);
  // the memory should be free at this point 
}

Oct 12 2008

tsalm <tsalm free.fr> writes:

 It's certainly a stupid question...
 I want to delete an dynamic array of the memory.
 I don't understand why the example above doesn't clear the memory
 uses
 by
 the array :
 /* ------------------------------- */
 import tango.time.Time;
 import tango.io.Stdout;
 import tango.stdc.stdio;
 import tango.core.Memory;
 void main()
 {
 // Create a big array
 int[] t =3D new int[100000000];
 // delete the array
 t =3D null;
 // Clean the memory
 GC.collect();
 GC.minimize();
 // No, it's not free :-(
 Stdout("Now, the memory must be free...")();getchar;
 }
 /* ------------------------------- */
 How can I totally clear this array of the memory ?
 Thanks in advance,
 TSalm

 I had the same problem. It seems to me that Tango GC just doens't
 collect dynamically allocated arrays! (But collects when you use
 t.lenght)
  This worked for me:
  import tango.core.Memory;
  GC.free (t.ptr);

 Not for me :(
 Here is my code :
 /*---------------------------------------*/
 import tango.io.Stdout;
 import tango.stdc.stdio;
 import tango.core.Memory;
 void main()
 {
 // Create a big array
 int[] t; // =3D new int[100000000];
 t.length =3D 100000000 ;
 // delete the array
 GC.free (t.ptr);
 // Clean the memory
 GC.collect();
 GC.minimize();
 // No, it's not free :-(
 Stdout("Now, the memory must be free...")();getchar;
 }

 Ok, here's the simplified version of code I used:

 class X {

   int[] t;

   void resize (int size) {

     GC.free (t.ptr);
     t =3D new int[size];
   }
 }

 void main () {

   X x =3D new X();
   x.resize (100000000);
   // do something
   x.resize (0);
   // the memory should be free at this point }

Oops, I didn't understand that GC free the memory for itself, and not fo=
r  =

the system ^_^

In your case, can "delete" replace "GC.free" ?
All in all, "delete" works  on mine : the "old" memory space can be re-u=
se  =

by another array allocation.

But why GC.minimize doesn't free the memory to the system ? Does it come=
  =

 from Windows Vista ? Or is it the wrong command ?

Oct 12 2008

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