[gentoo-user] kdehiddenvisibility: What does it do?

[gentoo-user] kdehiddenvisibility: What does it do?

[Alexander Skwar]

Hello.

New KDE ebuilds feature a USE flag called "kdehiddenvisibility", which
is described as:

[-    ] kdehiddenvisibility - Makes KDE symbols hidden by default, requires GCC 4.1 (experimental)

Well, this doesn't tell me much. What would I get, if I'd enable this
flag? Where can I read more about this?

Thanks,

Alexander Skwar
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Re: [gentoo-user] kdehiddenvisibility: What does it do?

[Raymond Lewis Rebbeck]

http://gcc.gnu.org/wiki/Visibility should tell you all you need to know about 
the new symbol visibility features of gcc.

On Friday, 26 May 2006 17:12, Alexander Skwar wrote:
> Hello.
>
> New KDE ebuilds feature a USE flag called "kdehiddenvisibility", which
> is described as:
>
> [-    ] kdehiddenvisibility - Makes KDE symbols hidden by default, requires
> GCC 4.1 (experimental)
>
> Well, this doesn't tell me much. What would I get, if I'd enable this
> flag? Where can I read more about this?
>
> Thanks,
>
> Alexander Skwar
> --
> BOFH Excuse #408:
>
> Computers under water due to SYN flooding.

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Re: [gentoo-user] kdehiddenvisibility: What does it do?

[Graham Murray]

Alexander Skwar <listen@alexander.skwar.name> writes:

> New KDE ebuilds feature a USE flag called "kdehiddenvisibility", which
> is described as:
>
> [-    ] kdehiddenvisibility - Makes KDE symbols hidden by default, requires GCC 4.1 (experimental)
>
> Well, this doesn't tell me much. What would I get, if I'd enable this
> flag? Where can I read more about this?

One thing to note is that if you want to use kdehiddenvisibility then
you will have to re-emerge qt-3.3.6-r1 before rebuilding KDE as the
KDE builds (upstream) will disable hidden visibility unless qt
was built with the hidden visibility patch which is only applied when
building with >=gcc-4.1
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Re: [gentoo-user] kdehiddenvisibility: What does it do?

[Alexander Skwar]

Raymond Lewis Rebbeck wrote:
> http://gcc.gnu.org/wiki/Visibility should tell you all you need to know about 
> the new symbol visibility features of gcc.

It tell's me more than I want to know :)

Thanks for the pointer!

Alexander Skwar
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Re: [gentoo-user] kdehiddenvisibility: What does it do?

[Alexander Skwar]

Graham Murray wrote:

> One thing to note is that if you want to use kdehiddenvisibility then
> you will have to re-emerge qt-3.3.6-r1 before rebuilding KDE as the
> KDE builds (upstream) will disable hidden visibility unless qt
> was built with the hidden visibility patch which is only applied when
> building with >=gcc-4.1

Oh, good to know!

Thanks a lot,

Alexander Skwar
-- 
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never give assent to the long complicated statements of Christian dogma.
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Re: [gentoo-user] kdehiddenvisibility: What does it do?

[Dirk Heinrichs]

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Am Freitag, 26. Mai 2006 10:42 schrieb ext Graham Murray:

> One thing to note is that if you want to use kdehiddenvisibility then
> you will have to re-emerge qt-3.3.6-r1 before rebuilding KDE as the
> KDE builds (upstream) will disable hidden visibility unless qt
> was built with the hidden visibility patch which is only applied when
> building with >=gcc-4.1

FYI: Tried this last weekend after reading this thread. I've never seen KDE 
starting that fast!

Bye...

	Dirk
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Re: [gentoo-user] kdehiddenvisibility: What does it do?

[Eskej]

On Mon, 29 May 2006 09:33:30 +0400, Dirk Heinrichs  
<ext-dirk.heinrichs@nokia.com> wrote:

> FYI: Tried this last weekend after reading this thread. I've never seen  
> KDE
> starting that fast!

And I tried it too but didn't notice a slight increase! Maybe I did  
something wrong?

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Re: [gentoo-user] kdehiddenvisibility: What does it do?

[Dirk Heinrichs]

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Am Montag, 29. Mai 2006 08:36 schrieb ext Eskej:
> On Mon, 29 May 2006 09:33:30 +0400, Dirk Heinrichs
>
> <ext-dirk.heinrichs@nokia.com> wrote:
> > FYI: Tried this last weekend after reading this thread. I've never seen
> > KDE
> > starting that fast!
>
> And I tried it too but didn't notice a slight increase! Maybe I did
> something wrong?

Did you recompile qt with gcc-4.1 before recompiling KDE?

Bye...

	Dirk
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Re: [gentoo-user] kdehiddenvisibility: What does it do?

[Eskej]

On Mon, 29 May 2006 10:58:54 +0400, Dirk Heinrichs  
<ext-dirk.heinrichs@nokia.com> wrote:

>
> Did you recompile qt with gcc-4.1 before recompiling KDE?
>

Yeah of course. And all CFLAGS are right. I did try a little test
$ time konsole -e sh exit
And in both cases (3.4.6 and 4.1.1 +kdehiddenvisibility) it shows the same  
time ~1.08s



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Re: [gentoo-user] kdehiddenvisibility: What does it do?

[Dirk Heinrichs]

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Am Montag, 29. Mai 2006 09:58 schrieb ext Eskej:
> On Mon, 29 May 2006 10:58:54 +0400, Dirk Heinrichs
>
> <ext-dirk.heinrichs@nokia.com> wrote:
> > Did you recompile qt with gcc-4.1 before recompiling KDE?
>
> Yeah of course. And all CFLAGS are right. I did try a little test
> $ time konsole -e sh exit
> And in both cases (3.4.6 and 4.1.1 +kdehiddenvisibility) it shows the
> same time ~1.08s

Read my first mail again, please. I didn't write about a single app, I wrote 
about KDE startup.

Bye...

	Dirk
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Re: [gentoo-user] kdehiddenvisibility: What does it do?

[Eskej]

On Mon, 29 May 2006 12:24:20 +0400, Dirk Heinrichs  
<ext-dirk.heinrichs@nokia.com> wrote:

> Read my first mail again, please. I didn't write about a single app, I  
> wrote
> about KDE startup.

Oh, I'm sorry but shouldn't a single app be affected? And KDE startup time  
is hardly to measure.
So the question is open: has anybody noticed a _single application_  
performance increase with GCC 4.1 and hidden visibility. KDE I mean.
Or maybe Konsole is no good to make tests? But it is the only precise test  
I know. When it is about milliseconds human cannot see the difference  
really.


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Re: [gentoo-user] kdehiddenvisibility: What does it do?

[Hemmann, Volker Armin]

On Monday 29 May 2006 11:18, Eskej wrote:
> On Mon, 29 May 2006 12:24:20 +0400, Dirk Heinrichs
>
> <ext-dirk.heinrichs@nokia.com> wrote:
> > Read my first mail again, please. I didn't write about a single app, I
> > wrote
> > about KDE startup.
>
> Oh, I'm sorry but shouldn't a single app be affected? And KDE startup time
> is hardly to measure.
> So the question is open: has anybody noticed a _single application_
> performance increase with GCC 4.1 and hidden visibility. KDE I mean.
> Or maybe Konsole is no good to make tests? But it is the only precise test
> I know. When it is about milliseconds human cannot see the difference
> really.

kdeinit exists to 'preload' all libs. It was introduced, to keep the loading 
time of apps down to a bearable time. Without kdeinit or prelink, the startup 
time of every kde app would be insane. That is, why a single app should not 
be so much affected like the overall kde startup time. After the start, 
everything is 'prelinked' (not really, but kdeinit will be running), and the 
times of the apps are depend on how fast they 'link' against kdeinit....

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