Re: [PATCH] sysdeps/arm/armv7/multiarch/memcpy_impl.S: Improve performance.

["Carlos O'Donell" <carlos@redhat.com>]

On 09/04/2013 03:30 AM, Siddhesh Poyarekar wrote:
> On Tue, Sep 03, 2013 at 03:15:25PM -0400, Carlos O'Donell wrote:
>> I agree. The eventual goal of the project is to have some kind of
>> whole system benchmarking that allows users to feed in their profiles
>> and allow us as developers to see what users are doing with our library.
>>
>> Just like CPU designers feed in a whole distribution of applications
>> and look at the probability of instruction selection and tweak instruction
>> to microcode mappings.
>>
>> I am willing to accept a certain error in the process as long as I know
>> we are headed in the right direction. If we all disagree about the
>> direction we are going in then we should talk about it.
>>
>> I see:
>>
>> microbenchmarks -> whole system benchmarks -> profile driven optimizations
> 
> I've mentioned this before - microbenchmarks are not a way to whole
> system benchmarks in that they don't replace system benchmarks.  We
> need to work on both in parallel because both have different goals.

Sorry, my ASCII graph was misleading, and I agree with you.

What I meant to say is that we need to walk before we run.
Creating a microbenchmark framework will give us the tools
we need to move on to whole system benchmarks and eventually
to profile driven optimizations. We will continue to do all
3 of these activities once we reach the end of that logical
progression.

Cheers,
Carlos.