Re: [PATCH] mempool: test performance with constant n

[Olivier Matz <olivier.matz@6wind.com>]

On Mon, Jan 24, 2022 at 03:53:09PM +0100, Olivier Matz wrote:
> From: Morten Brørup <mb@smartsharesystems.com>
> 
> "What gets measured gets done."
> 
> This patch adds mempool performance tests where the number of objects to
> put and get is constant at compile time, which may significantly improve
> the performance of these functions. [*]
> 
> Also, it is ensured that the array holding the object used for testing
> is cache line aligned, for maximum performance.
> 
> And finally, the following entries are added to the list of tests:
> - Number of kept objects: 512
> - Number of objects to get and to put: The number of pointers fitting
>   into a cache line, i.e. 8 or 16
> 
> [*] Some example performance test (with cache) results:
> 
> get_bulk=4 put_bulk=4 keep=128 constant_n=false rate_persec=280480972
> get_bulk=4 put_bulk=4 keep=128 constant_n=true  rate_persec=622159462
> 
> get_bulk=8 put_bulk=8 keep=128 constant_n=false rate_persec=477967155
> get_bulk=8 put_bulk=8 keep=128 constant_n=true  rate_persec=917582643
> 
> get_bulk=32 put_bulk=32 keep=32 constant_n=false rate_persec=871248691
> get_bulk=32 put_bulk=32 keep=32 constant_n=true rate_persec=1134021836
> 
> Signed-off-by: Morten Brørup <mb@smartsharesystems.com>
> Signed-off-by: Olivier Matz <olivier.matz@6wind.com>

Sorry, wrong title, "v2" is missing. Please ignore, I'm resending it.