[nycbug-talk] make -jN performance

[Isaac Levy]

Hi Dru, All,

On Jan 20, 2005, at 12:14 PM, <dlavigne6 at sympatico.ca> wrote:

>
>>
>> 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

4.10 systems all around.

Rocket-
.ike