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On Wed, Jun 24, 2015 at 01:13:40PM +0200, Alan McKinnon wrote: |
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> On 23/06/2015 15:05, behrouz khosravi wrote: |
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> > Hello everyone. |
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> > |
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> > I really like to have control over my machine as much as possible. In |
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> > this way I will learn a lot, so I am trying to remove all the default |
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> > use flags and control them manually. |
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> |
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> |
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> Here's some good advice: |
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> |
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> Don't do that. See below. |
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> |
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Nonsense - do that. If your goal is to learn how stuff works and you're |
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already reasonably familiar with C/C++ so you can debug any strange |
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errors that can happen, have fun. Just don't think you'll get any real |
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work done ;). i.e. it might be good to do this in a virtual machine and |
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still have a stable system for work. |
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> |
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> > I just don't know which "global" use flags are absolutely necessary to |
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> > the system to make it snappier or secure. |
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> |
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> That's a bit of a nonsensical line of thought, as what you think you |
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> want doesn't really exist. |
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> |
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> ... |
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> |
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> Put "-march=native" in CFLAGS |
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> |
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Yes. Also, properly setting CPU_FLAGS_X86 is another thing that can |
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speed up software *if* said software supports any special instruction |
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sets. Most "normal desktop software" like web browsers, email clients, |
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terminals, editors, etc. probably will not get a whole lot of benefit |
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either way, since most of this software is generally not CPU-bound and |
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is instead network/disk bound. |
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In the mornings I primarily use my desktop for reading email and |
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browsing news with firefox (mostly on sites with minimal JavaScript), |
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and I have yet to see my load averages climb higher than maybe 0.5. |
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Any software that does anything requiring lots of math will get a boost |
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from this type of stuff, though; graphics editing, most things in sci-* |
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categories, audio/video transcoding, etc. |
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Alec |
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P.S. Just realized I don't have "-march=native" in my CFLAGS. Time to |
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rice - could be getting 1% better performance. ;) |
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P.P.S. Also, on 1% better performance: My professor for the compilers |
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class I took used to (maybe still does) work at Google. Apparently |
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Google sees a <1% increase in performance as *the best thing ever*, |
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because it can save them a bunch of money in infrastructure and power. |
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Apparently Google are the ultimate ricers. |
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