Date: Sat, 28 Feb 2004 21:03:58 -0500 (EST) From: Robert Watson <rwatson@freebsd.org> To: Vincent Poy <vince@oahu.WURLDLINK.NET> Cc: current@freebsd.org Subject: Re: buildworld times Message-ID: <Pine.NEB.3.96L.1040228210128.24114W-100000@fledge.watson.org> In-Reply-To: <20040228155420.G8264-100000@oahu.WURLDLINK.NET>
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On Sat, 28 Feb 2004, Vincent Poy wrote: > On Sat, 28 Feb 2004, Robert Watson wrote: > > > On Sat, 28 Feb 2004, Vincent Poy wrote: > > > > > > 2.5 hours seems a little high and would seem to indicate that you're > > > > building world under a kernel that has all the debugging options enabled. > > > > Could you make your kernel config available? > > > > > > Yeah, I recall that -CURRENT on a Mobile PII 366Mhz took the > > > same amount of time so I would imagine the P4 would be faster since I > > > remember PIII running at 800Mhz or so would take about 2 hours and the > > > Athlon K7 at 1.2Ghz was about a little over an hour. I'm using the > > > standard GENERIC kernel and do have the debugging options enabled. > > > > Turning off the debugging options (especially WITNESS) can have a dramatic > > effect on performance. Give it a spin. :-) > > Besides the WITNESS and WITNESS_SKIPSPIN, do these have a big > effect as well? > > options DDB No runtime cost, and useful if anything goes wrong :-). > options INVARIANTS Small but non-zero cost. > options INVARIANT_SUPPORT Space overhead, but other than memory overhead, no run-time cost. > makeoptions DEBUG=-g Makes your kernel build real slow, but won't change the kernel speed. As you point out, debugging problems is a lot easier if you run with INVARIANTS+WITNESS. However, you may well see build times halve or more by running without WITNESS. Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Senior Research Scientist, McAfee Research
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