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Joshua J. Kugler wrote:
> On Monday 29 March 2010, Christopher Howard elucidated thus:
>> Joshua J. Kugler wrote:
>>> On Monday 29 March 2010, Christopher Howard elucidated thus:
>>>> So, at work I'm setting up a Gentoo system on an HP with an i7
>>>> processor (with eight virtual cores). I passed in -j7 as a make
>>>> option, and it built the whole bloody kernel, modules and
>>>> everything, in five minutes. Sweetness.
>>> Five? Wow...I seem to remember Linus T. bragging back in the day
>>> that his four processor system (this was when multi-CPU systems,
>>> especially
>>>
>>>> 2, were especially rare) only took 2.5 minutes. Must be seriously
>>> I/O bound.
>>>
>>> Can I find a citation for that? No...just going off memory.
>>>
>>> j
>> Really? Guess I'm just used to the hour/two-hour jobs on all my old
>> dual-cores and Pentium IIIs at home. I only passed in the -j7
>> makeopt... probably could have tweaked it more.
>
> Actually, the supposed optimal number is num_cores+1, so you should
> pass -j8 :)
>
>> Of course, there probably wasn't quite as much source code to build
>> back then...
>
> Right, 2.5 minutes back then, 5 minutes now...serious code growth.
> Hmm...did you compile *all* the modules? That would add some serious
> time as device support has grown by leaps and bounds. If you only
> compiled the drivers for your machine (i.e. only the needed modules or
> a monolithic kernel) then it would probably be REALLY fast.
>
> j
>
Yah, I pretty much compiled everything. On my older PCs I will take the
time to pick carefully exactly what I need, but on newer machines I
usually just tune a few settings here and there. I figure that, if I'm
compiling it as a module, it's really not going to hurt to have it
there, even if it never gets used.
- --
>>> Christopher Howard <<<<<<<<<<<<<<<<<<
>>> http://linuxprogrammingforums.com <<<
>>> http://indicium.us <<<<<<<<<<<<<<<<<<
>>> http://theologia.indicium.us <<<<<<<<
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Received on Mon Mar 29 20:17:17 2010
This archive was generated by hypermail 2.1.8 : Mon Mar 29 2010 - 20:17:17 AKDT