About GC

[Ali Çehreli]

On 02/24/2013 06:26 AM, Alexandr Druzhinin wrote:
 > In the following code http://dpaste.dzfl.pl/f4ae16aa
 > memory consumption depends on DATA_SIZE value. Bigger value bigger
 > consumption - it's natural. Consumption starts from some value and
 > continue to some threshold. After reachin this threshold comsumption
 > doesn't enlarge. This threshold depends on DATA_SIZE value and some
 > others.

What have you observed that threshold value to be? Your program has a 
constant 40 for the 'threshold' parameter. Is that the special value?

 > My question is how can I find this threshold to know is this
 > value suitable for real using or I should change something in my code.
 > Is there some guarantee that this threshold will be less than real
 > memory on the box? How can I control this threshold?

I don't understand the question yet but in general such optimizations 
depend on the actual program. You must make measurements to find that 
out for your program.

 > For example if DATA_SIZE = 300 000 memory consumption is 60-70
 > M, 200 000 - ~40M, 100 000 - ~ 18M (win7 64bits dmd 2.062)

I think that behavior is natural too but again, I don't understand the 
threshold from those figures.

 > And it's possible that if application suddenly gets data
 > more than before application may crashes because this threshold
 > oversize than available memory?

Possible. Sometimes, there may be a lot more memory that requested but 
the memory may be fragmented so that there is not any memory chunk as 
large as the requested amount.

Ali