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Mike Spitzer wrote: |
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> On Fri, Jun 08, 2007 at 11:26:54AM +0200, Florian Philipp wrote: |
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>> In other words, there is no clear answer but my chances are quiet bad. |
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>> |
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>> I think I'll try around a bit. I'll prepare three images on my desktop, one |
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>> Os, one O2 and one O3. |
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>> |
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>> Then I'll post my experience... |
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> |
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> Just from personal experience: I once compiled everything using O3 and |
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> couldn't tell any appreciable difference in speed on most applications. |
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> It also seemed to cause some applications to behave oddly or crash at |
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> weird times. Booting off of a boot cd and recompiling the whole system |
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> with O2 fixed all of the problems. |
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> |
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> That was with a PIII, though. I understand many apps now that have |
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> trouble with O3 are force to O2 with their ebuild, so your experience |
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> may end up being a lot different. It hasn't been worth it for me to try |
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> it again. |
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|
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I don't think it's just P3; I've heard of -O3 causing instability, |
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crashes, or whatnot on other archs too. The best thing is probably to |
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use -O2 in general, and use higher optimizations for specific |
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applications that you want to tune. |
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|
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- --Ravi |
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