Re: Do you use a garbage collector (java vs c++ difference in =?UTF-8?B?Im5ldyIp?=

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Razii writes:


What you're doing different in Java is that you're using the part of the
language that it's optimized for. Java is, generally, optimized for fast
instantiation of discrete objects on the heap, because creating a huge
number of objects is unavoidable in Java, and they all have to be allocat=
ed
on the heap, due to the nature of the language itself.

On the other case, in most use cases C++ does not require instantiation o=
f
as many discrete objects on the heap that Java does, for implementing an
equivalent task. In C++, most -- if not all -- of these objects can be
easily allocated on the stack.

So, if you were to do a fair comparison, you should benchmark instantiati=
on
of Java objects, on the heap, against instantiation of C++ objects on the
stack.

And then benchmark the comparable memory usage, to boot :-)

In your C++ example, there was no reason whatsoever to instantiate your C=
++
test object on the heap. What does that accomplish, besides a memory leak=
?
That's just the Java way of doing things, but, in C++ you have the option =
of
instantiating objects on the stack, so try benchmarking this instead:

int main(int argc, char *argv[]) {
 =09clock_t start=clock();
        for (int i=0; i<=10000000; i++)
        {
           Test testObj(i);

           if (i % 5000000 == 0)
             cout << &testObj << endl;
        }

        clock_t endt=clock();
        std::cout <<"Time: " <<
               double(endt-start)/CLOCKS_PER_SEC * 1000 << " ms\n";
}

See how well /that/ benchmarks against Java :-)

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