Re: [eigen] Eigen Benchmark (number of FLOPS) |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx
*Subject*: Re: [eigen] Eigen Benchmark (number of FLOPS)
*From*: Not Sure <kuerzn@xxxxxxxxxxxxxx>
*Date*: Mon, 19 Dec 2011 15:13:41 +0100
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Ok Thanks
-------- Original Message --------
Subject: Re: [eigen] Eigen Benchmark (number of FLOPS)
From: Benoit Jacob <jacob.benoit.1@xxxxxxxxx>
To: eigen@xxxxxxxxxxxxxxxxxxx
Date: 19.12.2011 14:04
> 2011/12/18 Not Sure <kuerzn@xxxxxxxxxxxxxx>:
>> Hi!
>> On the website http://eigen.tuxfamily.org/index.php?title=Benchmark you
>> show some pretty impressive comparison of Eigen's performance.
>> I have two consecutive questions:
>>
>> 1. Do the different implementations/library of BLAS functions differ in
>> the number of floating point operations (FLOP) they need to complete?
>>
>> 2. If yes: Did you calculate the FLOP per second using some reference
>> FLOP number or the number of actual performed FLOP of each
>> implementation/library?
>
> My understanding is that the FLOPs in this benchmark are based on a
> theoretical estimate of the number of operations required by a given
> algorithm. For example: 2*n^3 for GEMM on nxn matrices, etc. This is
> sometimes inaccurate for small sizes, but at least the scale is the
> same for all contenders.
>
> Benoit
>
>>
>> Thank you for your answer,
>>
>> Johannes
>>
>>
>
>