[Beowulf] GP-GPU experience

[Vincent Diepeveen]

On Apr 5, 2011, at 9:58 AM, Vincent Diepeveen wrote:

>
> On Apr 5, 2011, at 7:22 AM, Greg Lindahl wrote:
>
>> On Mon, Apr 04, 2011 at 09:54:37AM -0700, Massimiliano Fatica wrote:
>>
>>> If you are old enough to remember the time when the first distribute
>>> computers appeared on the scene,
>>> this is a deja-vu.
>>
>> Not to mention the prior appearance of array processors. Oil+Gas
>> bought a lot of those, too. Some important radio astronomy data
>> reduction algorithms were coded for them -- a VAX 11/780+FPS AP120B
>> was 10X faster than the VAX by itself. Then microprocessor-based
>> workstations arrived, and the game was over, ease of use FTW.
>>
>>> Even on a single system, if you try an auto-parallel/auto- 
>>> vectorizing
>>> compiler on a real code, your results will probably be  
>>> disappointing.
>>
>> The wins from such compilers have been steadily decreasing, as main
>> memory gets farther and farther away from the CPU and caches.
>>
>> -- greg
>

Early Morning oh oh oh oh, apologies the context might be clear yet
the sentences were written down wrong.

> It's different this time indeed; classic cpu's will never again
> deliver big performance.
>

ack

> cache - coherency is simply too complicated with many cores.


1) Cache-coherency is too complicated for CPU's

> cpu's also will need a manycore co-processor therefore.
>

ack

> furthermore manycores simply are cheaper to produce and they can eat
> a bigger powerbudget.
>

ack

> 3 very powerful arguments which regrettably limits cpu's, but that's
> the price we pay for progress.
>

ack

> It won't mean cpu's will go away of course any soon, they're so
> generic and easy to program that
> they will survive. Just offload the calculations to the manycores.
>

ack

> please don't estimate the argument of cheaper to produce.
>
>

please don't 	UNDERESTIMATE the argument of cheaper to produce

only 6 out of 8 score = 75% sharp in the morning

>
>>
>>
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