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Could Gentoo be slower than Fedora?
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billydv
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PostPosted: Wed Apr 24, 2013 1:22 am    Post subject: Could Gentoo be slower than Fedora? Reply with quote

I have numerous times checked a particular test (peacekeeper browser rating http://peacekeeper.futuremark.com/) to see firefox performance in Gentoo. My Gentoo box is a Maximum PC Dream Machine vs my Fedora box yet consistently my Fedora box beats my Gentoo box by several hundred points. Just tonight 2874 on Gentoo vs 3304 on Fedora on considerably lesser PC hardware. How can this be?
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PaulBredbury
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PostPosted: Wed Apr 24, 2013 1:55 am    Post subject: Reply with quote

Looks like Fedora uses gcc 4.8 already.

Edit: Also, Fedora's xulrunner gets compiled with -Os instead of -O3 (see rhbz-928353.patch, from weird bug).
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ppurka
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PostPosted: Wed Apr 24, 2013 2:29 am    Post subject: Reply with quote

PaulBredbury wrote:
Looks like Fedora uses gcc 4.8 already.

Edit: Also, Fedora's xulrunner gets compiled with -Os instead of -O3 (see rhbz-928353.patch, from weird bug).
Bigger ricers than gentoo. :twisted:
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Ion Silverbolt
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PostPosted: Wed Apr 24, 2013 4:39 pm    Post subject: Reply with quote

There are lots of variables we don't know here. What are your cflags in make.conf set to? Which use flags did you enable when you compiled firefox? Which version of gcc did you use? Did you use lto? Many factors can affect performance.

Benchmarking isn't always a reliable reflection of real world performance either.
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Ant P.
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PostPosted: Wed Apr 24, 2013 6:46 pm    Post subject: Reply with quote

It's worth remembering that not many Gentoo users have the necessary RAM to build Firefox with the crazy optimisations prepackaged versions use. Mozilla itself is pushing up against the limits of its 32-bit build nodes as of late.
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krinn
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PostPosted: Wed Apr 24, 2013 7:50 pm    Post subject: Reply with quote

Could only answer yes to your question.

If the general consensus (i'm not saying it's true or false) says gentoo can be less bloated than distro XXX, nothing stop someone to bloat his gentoo to a level other distro could hardly reach.
The freedom to have the most ugly, sluggish and slowest distro out there is freedom.
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genstorm
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PostPosted: Wed Apr 24, 2013 8:23 pm    Post subject: Reply with quote

In other words, my Gentoo != your Gentoo :lol:
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NeddySeagoon
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PostPosted: Wed Apr 24, 2013 8:53 pm    Post subject: Reply with quote

billydv,

Yep, if you build your Gentoo with -march=i686 it will run on a PentiumPro.
It will not use mmx or any of the other multimedia speedups found on modern CPUs.
It won't even play 1080p HD videos smoothly on your hardware.

You can make it slow if you want to, that the beauty of Gentoos flexibility.
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aCOSwt
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PostPosted: Wed Apr 24, 2013 9:19 pm    Post subject: Reply with quote

PaulBredbury wrote:
Looks like Fedora uses gcc 4.8 already.

Edit: Also, Fedora's xulrunner gets compiled with -Os instead of -O3 (see rhbz-928353.patch, from weird bug).

I also guess that billydv's fedora is F18, in other words a 3.6 kernel... that is... the most efficient money can buy.
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Yamakuzure
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PostPosted: Thu Apr 25, 2013 6:26 am    Post subject: Reply with quote

I found this interesting, so I made some tests: (I have a laptop with Intel i7 Dual Core, first generation, and 4GB RAM)

First run, firefox-20.0.1 and qupzilla-1.4.1 merged with
Code:
CFLAGS="-march=native -O2 -pipe"
and default USE flags:
  1. qupzilla score: 1,762
  2. firefox score: 2,160
Then I re-emerged only the browsers (qupzilla depends heavily on qtwebkit, which I did not re-emerge!) with
Code:
CFLAGS="-march=native -pipe -Os \
-fgraphite-identity -floop-interchange -floop-strip-mine -floop-block \
-ftree-loop-distribution \
-floop-parallelize-all -ftree-parallelize-loops=8"
and added
Code:
www-client/firefox custom-cflags system-jpeg system-sqlite
to /etc/portage/package.use:
  1. qupzilla score: 1,841
  2. firefox score: 2,239
Although it is not that much, it is a definite raise.

However, I didn't feel bold enough to activate USE="custom-optimization" for firefox... Maybe that is what gives the edge. And who knows what gcc-4.8 with lto can do compared to my gcc-4.7.2 without lto...
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trismo
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PostPosted: Thu Apr 25, 2013 8:47 pm    Post subject: Reply with quote

this benchmark hard depend on the performance from vpx cairo pango gstreamer not firefox / xulrunner
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Yamakuzure
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PostPosted: Mon Apr 29, 2013 9:43 am    Post subject: Reply with quote

trismo wrote:
this benchmark hard depend on the performance from vpx cairo pango gstreamer not firefox / xulrunner
Well, I did feel bold enough to try out firefox with USE="custom-optimization" and the result dropped from the former 1,841 points down to 1,152. So I daresay the way firefox is built *does* has at least some impact. ;)
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