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May 30, 2006
Garbage collector
Hi all,

DMD 0.159 win32, Why I don't see my memory exploding while the program 
is running?


int main(char[][] argv) {
    std.gc.disable();
    for (int i=0; i < 1000000; i++) {
        byte[] a = new byte[10000000];
    }
}

Thanks!

---
Paolo Invernizzi
May 30, 2006
Re: Garbage collector
Paolo Invernizzi wrote:
> Hi all,
> 
> DMD 0.159 win32, Why I don't see my memory exploding while the program
> is running?
> 
> 
> int main(char[][] argv) {
>     std.gc.disable();
>     for (int i=0; i < 1000000; i++) {
>         byte[] a = new byte[10000000];
>     }
> }
> 
> Thanks!
> 
> ---
> Paolo Invernizzi

Well, I can only think of a few possibilities:

1. DMD is (for some reason) still collecting the old arrays.
2. DMD is smart enough to omit that line entirely since it knows you're
not using it.
3. You have 9 terabytes of RAM.

If #3 is correct, I want your machine.

The only other thing I can think of is that the program is crashing, but
not telling you.  Have you verified that the program is getting past
that for loop?

	-- Daniel

-- 
Unlike Knuth, I have neither proven or tried the above; it may not even
make sense.

v2sw5+8Yhw5ln4+5pr6OFPma8u6+7Lw4Tm6+7l6+7D
i28a2Xs3MSr2e4/6+7t4TNSMb6HTOp5en5g6RAHCP  http://hackerkey.com/
May 30, 2006
Re: Garbage collector
Daniel Keep wrote:
> Paolo Invernizzi wrote:
>> Hi all,
>>
>> DMD 0.159 win32, Why I don't see my memory exploding while the program
>> is running?
>>
>>
>> int main(char[][] argv) {
>>     std.gc.disable();
>>     for (int i=0; i < 1000000; i++) {
>>         byte[] a = new byte[10000000];
>>     }
>> }
>>
>> Thanks!
>>
>> ---
>> Paolo Invernizzi
> 
> Well, I can only think of a few possibilities:
> 
> 1. DMD is (for some reason) still collecting the old arrays.
> 2. DMD is smart enough to omit that line entirely since it knows you're
> not using it.
> 3. You have 9 terabytes of RAM.
> 
> If #3 is correct, I want your machine.

There's the fourth option => std.gc.disable is not implemented.
I was also curious about this, so I checked the source and 
std.gc.disable/enable only seem to increment/decrement one variable that 
is never used...


-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GCS/M d-pu s+: a-->----- C+++$>++++ UL P+ L+ E--- W++ N++ o? K? w++ !O 
!M V? PS- PE- Y PGP t 5 X? R tv-- b DI- D+ G e>+++ h>++ !r !y
------END GEEK CODE BLOCK------

Tomasz Stachowiak  /+ a.k.a. h3r3tic +/
May 30, 2006
Re: Garbage collector
Daniel Keep escribió:
>> 
>> [snip]
> 3. You have 9 terabytes of RAM.
> 
> If #3 is correct, I want your machine.

LOL!!! :')

> [snip]

--
Tom;
May 31, 2006
Re: Garbage collector
Tom S wrote:
> Daniel Keep wrote:
>> Paolo Invernizzi wrote:
>>> Hi all,
>>>
>>> DMD 0.159 win32, Why I don't see my memory exploding while the program
>>> is running?
>>>
>>>
>>> int main(char[][] argv) {
>>>     std.gc.disable();
>>>     for (int i=0; i < 1000000; i++) {
>>>         byte[] a = new byte[10000000];
>>>     }
>>> }
>>>
>>> Thanks!
>>>
>>> ---
>>> Paolo Invernizzi
>>
>> Well, I can only think of a few possibilities:
>>
>> 1. DMD is (for some reason) still collecting the old arrays.
>> 2. DMD is smart enough to omit that line entirely since it knows you're
>> not using it.
>> 3. You have 9 terabytes of RAM.
>>
>> If #3 is correct, I want your machine.
> 
> There's the fourth option => std.gc.disable is not implemented.
> I was also curious about this, so I checked the source and
> std.gc.disable/enable only seem to increment/decrement one variable that
> is never used...
> 
> 

HAHAHAHA.  Oh, I wasn't expecting that one...  Hopefully that gets fixed
at some point :P

	-- Daniel

-- 
Unlike Knuth, I have neither proven or tried the above; it may not even
make sense.

v2sw5+8Yhw5ln4+5pr6OFPma8u6+7Lw4Tm6+7l6+7D
i28a2Xs3MSr2e4/6+7t4TNSMb6HTOp5en5g6RAHCP  http://hackerkey.com/
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