Re: [boost] [Block Pointer] benchmark

Subject: Re: [boost] [Block Pointer] benchmark
From: Phil Bouchard (philippe_at_[hidden])
Date: 2011-05-25 19:55:45

On 5/25/2011 4:15 PM, Phil Endecott wrote:
>
> That effect should be immeasurably small, or eliminated entirely by the
> compiler.
>
> I think you had better post your benchmark code. There must surely be
> something else going on here.

In debug mode I see that:
1) worker_name() run by auto_ptr calls the following on each iteration:
- make_auto<int>()
   - operator new
   - auto_ptr::auto_ptr(int *)
   - operator auto_ptr_ref ()
   - auto_ptr::auto_ptr(auto_ptr_ref())
   - ~auto_ptr
- auto_ptr_ref<int>()
   ...
- auto_ptr<int>::operator = (auto_ptr_ref<int>)
   ...
- auto_ptr<int>::~auto_ptr<int>()
   ...

2) worker_new() run by auto_ptr simply calls
- operator new
- auto_ptr<int>::reset(int *)

I haven't debugged the release mode but we see that there is a lot of 
work to do to optimize worker_name() run by auto_ptr

-Phil