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Subject: Re: Hyperthreading question on duals, I know it's bad but why?

Author: Eugene Nalimov

Date: 16:06:54 09/18/03

Go up one level in this thread


On September 18, 2003 at 18:32:23, Gian-Carlo Pascutto wrote:

>On September 18, 2003 at 11:06:13, Robert Hyatt wrote:
>
>>On September 18, 2003 at 03:50:11, Gian-Carlo Pascutto wrote:
>>
>>>On September 17, 2003 at 16:03:09, Robert Hyatt wrote:
>>>
>>>>On September 17, 2003 at 14:54:41, Vincent Diepeveen wrote:
>>>>
>>>>>On September 17, 2003 at 14:47:49, Robert Hyatt wrote:
>>>>>
>>>>>lower clocked opterons are like $300, so i am pretty sure there is a big demand
>>>>>already.
>>>>
>>>>No there isn't, because for single and dual machines, the NUMA issue can
>>>>pretty well be ignored
>>>
>>>Ignored? You _will_ get a performance handicap if you do so.
>>>
>>>--
>>>GCP
>>
>>Yes, but on a dual it is a _minimal_ handicap.
>
>Last week, this 'minimal' handicap was enough to require a special
>version of Crafty. Now it's not needed for the Linux kernel? Uhh...

I believe you never participated in a *huge* software project. While you can
relatively easy do something for a small (~100k lines) program, especially if
nobody expects 24/7 reliability from that program, it's very hard to incorporate
new features into huge product when (a) currently those features are not needed
for 99.9% of customers, and for 95% of the remaining ones speedup will be in the
single-digit range, (b) you need API changes, (c) there is already long pipelne
of changes that are much more urgent, (d) changes are necessary not on GUI side
(or some external tools, or some localized components), but spread over the
product's core. And so on, and so on...

Thanks,
Eugene

>--
>GCP



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