Re: [boost] [Block Pointer] benchmark

Subject: Re: [boost] [Block Pointer] benchmark
From: Phil Bouchard (philippe_at_[hidden])
Date: 2011-05-27 17:07:32

On 5/27/2011 6:25 AM, Frank Mori Hess wrote:
>
> My cpu cores turn down their clock frequency when idle to save power, and I
> don't know how long it takes to switch speeds.  Maybe the cpu clock speed is
> jumping from low to high speed while the benchmark is running.

I get different results after changing the priority:

# nice --20 .../benchmark
new:
auto_ptr:                    9602673 ns
shared_ptr:                 21695797 ns
block_ptr:                 136451426 ns

make:
auto_ptr:                   10390549 ns
shared_ptr:                 21044471 ns
block_ptr:                 237520341 ns

# nice -20 .../benchmark
new:
auto_ptr:                    9317126 ns
shared_ptr:                 17450029 ns
block_ptr:                  69507905 ns

make:
auto_ptr:                    5028312 ns
shared_ptr:                 10538796 ns
block_ptr:                 117030907 ns

Although worker_make looks faster for auto_ptr & shared_ptr, it is 
slower for block_ptr.  The assembly code is still much simpler for 
worker_new and it should be faster.

-Phil