On Wed, Sep 13, 2006 at 09:57:25PM -0700, Gary Kline wrote: > On Thu, Sep 14, 2006 at 10:07:35AM +1000, Tony Maher wrote: > > Gary Kline wrote: > > > > > <deleted> > > > > > > A couple of things. Will having gcc unroll loops have any > > > negative consequences? (I can't imagine how:: but better > > > informed than to have something crash inexplicability.) > > > With 6.X safe at -O2 and with -funroll-loops, that should be > > > a slight gain, right? (It also will make an upgrade from 5.5 > > > to 6.[12] that much more rational.) > > > > -funroll-loops affect loader see > > http://lists.freebsd.org/pipermail/freebsd-stable/2006-September/028145.html > > > > Right. This is probably what Chuck Swiger was talking about. > I've never had this problems on my 5.[345] releases. And not > with 6.1 (knock-wood!!). > > I've just upgraded to -RELEASE and going to rebuild overnight on > the server that traped out. With -funroll-loops gone :-)
Just leave it alone unless you know what you're doing...fiddling with the compiler flags just isn't going to give you a secret performance boost for general workloads, no matter how cool it might make you feel :) Kris
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