[nycbug-talk] make -jN performance

[dlavigne6 at sympatico.ca]

> 
> From: Isaac Levy <ike at lesmuug.org>
> Date: 2005/01/20 Thu AM 11:59:45 EST
> To: Pete Wright <pete at finn.nomadlogic.org>
> CC: talk at lists.nycbug.org
> Subject: Re: [nycbug-talk] make -jN performance
> 
> Hey All,
> 
> On Jan 19, 2005, at 5:34 PM, Pete Wright wrote:
> 
> > hmm...then it looks like I should submit a PR to the doc team 
> > then...well
> > atleast it was an interesting exercise :)
> >
> > -pete
> 
> Yeah- I wanted to pipe in quicklike with this one with some super-crude 
> test results,
> 
> Basically I've been compiling a lot of FreeBSD jails lately, so what 
> the hey, I've thrown in some -j flags informally to see what happens, 
> here's my results:
> 
> --
> Single CPU (crufty old office 800mhz PIII):
> 
> - No flags, make world takes 49 min average.
> - j2, j4, j6, j10, all take 50 min average.
> 
> --
> Dual CPU (new-ish Dual Xeon 2.6mhz, under other server load):
> 
> - No flags, make world takes 22 min average.
> 
> - j2, j4, j6, j10, all take about 12 min average. (NICE.)
> 
> 
> 
> --
> Lots of other stuff could affect my results here, but in a nutshell, it 
> seems that the j flag has no effect unless there's more than 1 
> processor.

Is this on a 4.x or a 5.x system? I'm wondering if there's a difference between the two...

Dru