On Wed, 27 Feb 2013 23:38:34 +0100, Frederico Costa <fredpo...@mufley.com>
wrote:
On 2013-02-27 22:27, Michael Ross wrote:
If I read you right, you didn't ``make -jX buildworld'',
with X being the number of processes to spawn,
so you used just one core on either machine.
Buildworld does a lot of I/O, so disk speed is relevant.
Yes, i just made "make buildworld".
So i should use make -j2 on the S1(dual core) and -j4 on S2 (2xdualcore)?
And it also makes sense what you say about the I/O.
i will start another to see the results.
Maybe try higher settings.
Handbook ( http://www.freebsd.org/doc/handbook/makeworld.html ) says:
However, since much of the compiling process is I/O bound rather than CPU
bound, it is also useful on single CPU machines.
On a typical single-CPU machine, run:
# make -j4 buildworld
make(1) will then have up to 4 processes running at any one time.
Empirical evidence posted to the mailing lists shows this generally gives
the best performance benefit.
On a multi-CPU machine using an SMP configured kernel, try values between
6 and 10 and see how they speed things up.
Thanks
fred
On Wed, 27 Feb 2013 23:05:44 +0100, Frederico Costa
<fredpo...@mufley.com> wrote:
Hi everyone...
I have a kind of interesting question when comes to performance of
FreeBSD in different HW. i am not trying to come up with a scientific
reason for measuring performance. :-)
It is just a curiosity, and of course to see if i understand it and
improve performance of my systems.
i am running 2 systems at the moment, lets call them S1 and S2,
running FreeBSD 9.1-RELEASE-p1 amd64:
S1:
Intel Core2 Duo E6550 @ 2.33GHz
2GB RAM
500GB disk (not important probably just for reference)
S2:
2x Dual-Core AMD Opteron 2216 2.4GHz
14GB Ram
320GB disk (not important probably just for reference)
Both the systems are running more or less the same sw, apache, imap
server, postfix, and the needed perl/php/python and running very light
load. Also both are using a GENERIC kernel and not running X, they
are
just text based :-)
From cpubenchmark.net the cpu performance index are for s1: 1501 and
s2: 1518, so very similar.
As i felt the AMD system seemed slower when comes to compiling, i just
done a "performance test" which was "make buildworld" on both of
systems from scratch and the times are:
S1: 2h 12m
S2: 2h 59m
If I read you right, you didn't ``make -jX buildworld'',
with X being the number of processes to spawn,
so you used just one core on either machine.
Buildworld does a lot of I/O, so disk speed is relevant.
Regards,
Michael
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