Re: Dual processors ?

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#275

From: Floyd Davidson
Date: Sun, 05 Jan 2003 16:07

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Christopher Browne <cbbrowne@acm.org> wrote:
>After a long battle with technology,Floyd Davidson <floyd@ptialaska.net>, an earthling, wrote:
>>   >make clean;time make bzImage
>>
>> The above command ran in 2 minutes and 37 seconds, while
>>
>>   >make clean;time make -j2 MAKE='make -j2' bzImage
>>
>> ran in 1 minute 28 seconds.
>>
>> Basically, by taking advantage of both cpu's the compile was 1.8
>> times as fast.
>
>You /might/ discover that "-j3" or "-j4" would provide a little better
>performance, still, as it means that extra processes can get a bit of
>CPU bandwidth when other processes are waiting for I/O to complete.
>That does happen with kernel compilation.

Not likely.  Note that what I did is almost the same as

   make MAKE='make -j4' bzImage

Except it works in two subdirectories at once when the top level
make is given a -j2 option.

-- 
Floyd L. Davidson         <http://www.ptialaska.net/~floyd>
Ukpeagvik (Barrow, Alaska)                 floyd@barrow.com

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From: Floyd Davidson <floyd@ptialaska.net>
Newsgroups: aus.computers.linux,comp.os.linux.hardware,aus.ads.forsale.computers.used
Subject: Re: Dual processors ?
Date: 05 Jan 2003 07:07:03 -0900
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