• Walter Bright (3/3) Jan 26 2007 3rd try at this.
• Lionello Lunesu (5/8) Jan 26 2007 My problems have disappeared like snow in summer!
• Lionello Lunesu (5/14) Jan 28 2007 Thought I'd mention that a similar NRVO issue is still present in 1.003 ...
• Kevin Bealer (57/62) Jan 26 2007 I wanted to see how much difference the GC changes made; so I wrote a

Walter Bright <newshound digitalmars.com> writes:

3rd try at this.

http://www.digitalmars.com/d/changelog.html

http://ftp.digitalmars.com/dmd.1.003.zip

"Lionello Lunesu" <lionello lunesu.remove.com> writes:

"Walter Bright" <newshound digitalmars.com> wrote in message 
news:epdc9q$18so$1 digitaldaemon.com...
 3rd try at this.

 http://www.digitalmars.com/d/changelog.html

 http://ftp.digitalmars.com/dmd.1.003.zip

My problems have disappeared like snow in summer!

Thanks, have a great weekend! : )

L. 

"Lionello Lunesu" <lionello lunesu.remove.com> writes:

"Lionello Lunesu" <lionello lunesu.remove.com> wrote in message 
news:epdo76$1scc$1 digitaldaemon.com...
 "Walter Bright" <newshound digitalmars.com> wrote in message 
 news:epdc9q$18so$1 digitaldaemon.com...
 3rd try at this.

 http://www.digitalmars.com/d/changelog.html

 http://ftp.digitalmars.com/dmd.1.003.zip

 My problems have disappeared like snow in summer!

 Thanks, have a great weekend! : )

Thought I'd mention that a similar NRVO issue is still present in 1.003 and 
1.004: issue 832.

L. 

Kevin Bealer <kevinbealer gmail.com> writes:

Walter Bright wrote:
 3rd try at this.
 
 http://www.digitalmars.com/d/changelog.html
 
 http://ftp.digitalmars.com/dmd.1.003.zip

I wanted to see how much difference the GC changes made; so I wrote a 
program that fills arrays full of random ints 8 megabyte at a time.  It 
keeps 20 such arrays around, in an effort to trick the GC into 
'chaining' them together and therefore incorrectly leaking all the 
memory.  (Source code is below.)

With DMD 1.0, this runs slowly and hogs memory dramatically -- after an 
hour it was up to iteration 96, and had a VmSize of 814K (at this point 
I killed it.)

But with DMD 1.003, I was able to run it 3 times.  The total memory rose 
to 414K by iteration 153, then stayed exactly there till the application 
terminated at iteration 500.  It took about 40 seconds for each run.

(While this is not an real application, some scientific stuff does use 
large arrays of fairly random-looking packed binary data -- as it turns 
out I work on such a project.)

Great work!  Of course, a perfectly precise GC might be better, but I 
think this probably enables a lot of otherwise potentially dangerous 
things (video compression?) without losing the benefit of the GC.

Kevin


import std.stdio;
import std.stream;
import std.string;
import std.gc;
import std.c.stdlib;

char[] vminfo()
{
     Stream file = new BufferedFile("/proc/self/status");
     foreach(ulong n, char[] line; file) {
         if (find(line, "VmSize:") != -1) {
             return strip(split(line.dup, ":")[1]);
         }
     }

     return "no info";
}

int main(char[][] args)
{
     int[][] stuff;

     int NUM = 2_000_000;

     stuff.length = 20;

     disable();

     for(int i = 0; i < 500; i++) {
         int[] arr = new int[NUM];

         for(int j = 0; j < arr.length; j++) {
             arr[j] = rand();
         }

         int zig = i;
         if (zig > stuff.length)
             zig = rand() % stuff.length;

         stuff[zig] = arr;

         writefln("\nIter=%s", i);

         if (i == 20) {
             enable();
         }

         writefln("%s", vminfo);
     }

     return 0;
}