Date: Thu, 28 Feb 2013 18:23:02 +0000 From: Frederico Costa <fredports@mufley.com> To: Warren Block <wblock@wonkity.com> Cc: Michael Ross <gmx@ross.cx>, freebsd-questions@freebsd.org Subject: Re: Performance Related Question Message-ID: <3e5f08a6797b963f947fa83cd208600b@www.mufley.com> In-Reply-To: <alpine.BSF.2.00.1302271551320.57262@wonkity.com> References: <8d801e895617b492ddf724b6ce980448@www.mufley.com> <op.ws6rcqqsg7njmm@michael-think> <95256df2d5f04884368acf0f73bb82d0@www.mufley.com> <alpine.BSF.2.00.1302271551320.57262@wonkity.com>
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Hi... And thanks for the suggestions. I have now tested with -j option and i can confirm that my expectations are correct the Dual CPU dual core AMD completes the buildworld with -j4 in one hour only, while the intal core 2 does it in 1h30m should i stick the -j option in the make.conf? Fred On 2013-02-27 22:58, Warren Block wrote: > On Wed, 27 Feb 2013, Frederico Costa 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. > > It really depends on the system. On my dual-core systems, I use > devel/ccache and found that -j8 gave the best performance.
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