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nptl - Enable or don't ? Native POSIX Threads Library
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Tux12Fun
Tux's lil' helper
Tux's lil' helper


Joined: 16 Aug 2007
Posts: 149

PostPosted: Sat Nov 10, 2012 5:37 pm    Post subject: nptl - Enable or don't ? Native POSIX Threads Library Reply with quote

Hi,

I've seen that my gcc is currently without the NPTL USE Flag.
As I've read on websites, NPTL is a new Thread Model.

Now is my question, should I enable this USE-Flag.
Witch performance influence could occur?

I'm using the following kernel:

* sys-kernel/gentoo-sources
Latest version available: 3.6.6
Latest version installed: 3.6.6
Size of files: 80,539 kB
Homepage: http://dev.gentoo.org/~mpagano/genpatches
Description: Full sources including the Gentoo patchset for the 3.6 kernel tree
License: GPL-2 !deblob? ( freedist )

Thank you for your hints.
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Kollin
Veteran
Veteran


Joined: 25 Feb 2006
Posts: 1098
Location: Sofia/Bulgaria

PostPosted: Sat Nov 10, 2012 8:00 pm    Post subject: Reply with quote

Are you using stable or testing, may be the profile also matters?
I'm using the testing branch and desktop/kde profile, nptl is enabled by default:

Code:
emerge -pv gcc

These are the packages that would be merged, in order:

Calculating dependencies                               ... done!
[ebuild   R    ] sys-devel/gcc-4.6.3:4.6  USE="cxx fortran gtk mudflap (multilib) nls nptl openmp (-altivec) -bootstrap -build -doc (-fixed-point) -gcj -go -graphite (-hardened) (-libssp) -multislot -nocxx -nopie -nossp -objc -objc++ -objc-gc {-test} -vanilla"

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Ant P.
Advocate
Advocate


Joined: 18 Apr 2009
Posts: 2280
Location: UK

PostPosted: Sat Nov 10, 2012 8:06 pm    Post subject: Reply with quote

NPTL was new... about ten years ago. Is there any reason why you've changed it from the enabled default?
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