C++ Map does not release memory

[himanshubahl]

Hi,
I have created a small map like this.
typedef map<int,string> TEST_MAP;
TEST_MAP testMap;

I add about 10,000 string entries into the map like this

tempStr="test Program";
for(int counter =0;counter<10000;counter++)
testMap[counter]= tempStr;

the size of the memory used by the program increases to some amount after I have added the entries. ( I saw it using top command in linux )

then I added some more entries like this.

for(int counter =10000;counter<20000;counter++)
testMap[counter]= tempStr;

The size of the program again increases to some new value.

But when I delete the entries like the following the program size remains the same. It does not dicreases. I.e the program does not release the memory used by it.

for(int counter =0;counter<20000;counter++)
{
testMap.erase(counter);
}

can any one help ?

Sincerely,
Himanshu.

[DeMan]

How do you know memory is not being released? Presumably you are measuring somehow the memory used? Do you know (for example) how much memory is leaking?

[himanshubahl]

actually I was using the top utility of linux to see howmuch memory the program consumes.