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[ILUG] 2.6 Kernel + Hyperthreading

[ILUG] 2.6 Kernel + Hyperthreading

bobb bobb at redbrick.dcu.ie
Fri Sep 10 17:41:47 IST 2004


Bryan O'Donoghue hath declared on Friday the 10 day of September 2004  :-:
 
> > How much time do your production systems spend compiling?
> 
> I don't think that's relevant... how much time do my production servers 
> spend under high system load, is a better question.

How long does it take to recompile gentoo, how often do you do this ?
 
> Just on the one and my laptop. You'll appreciate it's not the distro, 
> which I'd espouse, rather, the logic that optimising as "close to the 
> iron" as possible _always_, _has_ to make sense...

I, like Ronan, live in the scientific computing world where we try to
squeeze every last drop of power out of the system.

My machines spend like 99.99% of their time running one_single_application,
granted that application changes every few days... but still...
The machines sit there with a constnat load of about 2.

Whats importand is that _that_ application is optomised for you particular
architecture, cache, etc...  optomising the OS isn't going to make much
of a dent in the performance.... of course the time taken to recompile
the OS _is_ going to impact on the performance...

- bobb

-- 
Mr. Rogers could explain shoe-tying and make it seem like the coolest 
thing in the world. He was our Uncle and older brother. He told us we 
were special, and we knew he'd be there for us.
A cult leader, right down to the sneakers.



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