How to release memory? (D2.0.30)

[downs]

BCS wrote:
> Hello AxelS,
> 
>> BCS Wrote:
>>
>>> You can't. The D runtime (and most other runtimes) don't ever reduce
>>> the amount of memory they keep in the heap. If you where to allocate
>>> another 25MB right after that function you would see no change in the
>>> memory usage. The good news is that with virtual memory, all of that
>>> has almost zero cost. What matters is how much ram you are actively
>>> using.
>>>
>> I want to load and send a file via network...when I load the entire
>> file into memory it's very stupid that I can't release that memory
>> again...
>>
>> OK I'll try it with the C API but thanks for your help!
>>
> 
> C's runtime (malloc/free) doesn't return memory to the OS either.

Um .. yes it does. :)

#include <stdio.h>
#include <stdlib.h>

int main() {
  void *p = calloc(1024*1024*256, 1);
  system("sleep 10");
  free(p);
  system("sleep 10");
  return 0;
}

Run that, wait 10s, and watch the memory usage go down.