Subject: Re: Kernel 2.2.19 crashes, 2.4.4 bad performance
From: T. Weyergraf (kirk@colinet.de)
Date: Tue May 15 2001 - 00:07:06 PDT
> Hello Thomas,
Hi,
> I am curious about your test.
>
> I am assuming that you built kernel-2.4.4 under 2.2.19 and 2.4.4??
Yes, this is correct. I build kernel-2.4.4 with the same .config and after doing a full
make dep ; make clean cycle - obviously, in order to give the exact same thing to build.
> Why did you use -j4 instead of -j2 on a dual processor box??
This is my personal historical preference. Creating four parallel jobs ensures, that there is
at least one extra job scheduled for execution for each CPU. Since make -j<something>
creates jobs after one being finished and the limit of concurrent jobs is below the -j
parameter, using 4 instead of 2 interleaves the times make needs to determine weather
it should create another job or not.
In practice, if found, the the variance between several runs of the same make-based
buildprocess is smaller, if you exceed the number of CPU's by the number of concurrent
jobs created via -j. Obviously, it isn't any faster in reality.
Regards,
Thomas
-- Thomas Weyergraf kirk@colinet.de My Favorite IA64 Opcode-guess ( see arch/ia64/lib/memset.S ) "br.ret.spnt.few" - got back from getting beer, did not spend a lot.-- To UNSUBSCRIBE, email to debian-alpha-request@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
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