multi-core software

Jon Harrop jon at ffconsultancy.com
Wed Jun 10 16:44:05 CEST 2009


Arved Sandstrom wrote:
> Jon Harrop wrote:
>> Arved Sandstrom wrote:
>>> Jon Harrop wrote:
>>>> No. Concurrent programming is about interleaving computations in order
>>>> to reduce latency. Nothing to do with parallelism.
>>>
>>> Jon, I do concurrent programming all the time, as do most of my peers.
>>> Way down on the list of why we do it is the reduction of latency.
>> 
>> What is higher on the list?
> 
> Correctness.
> 
> I'm not being facetious. I write applications that run on application
> servers, and from time to time I have had to write various special
> purpose servers. This kind of programming is all about managing
> concurrent execution of computations. The overarching concern is 
> reliability and correct function. For many corporate situations, even
> with hundreds of users, the actual load at any instant is low enough
> that the various servers involved are nowhere close to being stressed
> out - performance is a secondary issue.

In other words, without concurrency the latency would be so high that you
would consider the program to be wrong. However you cut it, the real reason
is latency.

-- 
Dr Jon D Harrop, Flying Frog Consultancy Ltd.
http://www.ffconsultancy.com/?u



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