Re: [boost] [Block Pointer] benchmark

Subject: Re: [boost] [Block Pointer] benchmark
From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2011-05-27 09:25:33

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On Thursday, May 26, 2011, Phil Bouchard wrote:
> 
> You're right but make remains the same:
> 1)
> new:
> shared_ptr:                 21234066 ns
> make:
> shared_ptr:                 18122766 ns
> 
> 2)
> make:
> shared_ptr:                 18271141 ns
> new:
> shared_ptr:                 13395539 ns
> 

That's not what I see on my machine:

$ ./a.out
new:
shared_ptr:                 15096947 ns
make:
shared_ptr:                 10986592 ns

# recompile with different order

$ ./a.out
make:
shared_ptr:                 14187251 ns
new:
shared_ptr:                 11498070 ns

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.

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