Date: Wed, 27 Feb 2013 23:53:03 +0100 From: "Michael Ross" <gmx@ross.cx> To: "Frederico Costa" <fredports@mufley.com> Cc: freebsd-questions@freebsd.org Subject: Re: Performance Related Question Message-ID: <op.ws6sipwgg7njmm@michael-think> In-Reply-To: <95256df2d5f04884368acf0f73bb82d0@www.mufley.com> References: <8d801e895617b492ddf724b6ce980448@www.mufley.com> <op.ws6rcqqsg7njmm@michael-think> <95256df2d5f04884368acf0f73bb82d0@www.mufley.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, 27 Feb 2013 23:38:34 +0100, Frederico Costa <fredports@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 >> <fredports@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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?op.ws6sipwgg7njmm>