gm RES memory problem

hi，

Recently, a graphicsmagick memory problem bother us. We found that the memory is not returned back to system when magickwand is destroyed. I write a simple program to reproduce it:

#include <stdlib.h>
#include <stdio.h>
#include <wand/magick_wand.h>

int main(int argc,char **argv) {
   MagickWand *magick_wand;
   magick_wand=NewMagickWand();

   MagickReadImage(magick_wand,"./test.gif");

   DestroyMagickWand(magick_wand);
   DestroyMagick();
   sleep(1000000);
}

I simply read a gif image and destroy it, and the RES memory is finally stabilized at 172476 when sleep.

This is not a memory leak, when I call it in a for loop, the memory just fluctuate at this level. It is likely something has been cached.

So I want to know what does GM do and why.

My GM versin is 1.3.29 and system is Centos7.1

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