[Zope] Re: Zope or Python blocking on select()

[Thomas Bennett]

FYI: LD_ASSUME_KERNEL From

 http://people.redhat.com/drepper/assumekernel.html

This means no LD_ASSUME_KERNEL setting requesting versions earlier than
2.2.5 will work at all. Versions from 2.2.5 to 2.4.0 will use the DSOs
in /lib, versions from 2.4.1 to 2.4.19 will use the DSOs in /lib/i686,
versions 2.4.20 and younger will use the DSOs in /lib/tls.

The specific ABI version requirements on a RHL9, and Fedora Core 1 and 2
system are as follows (NB: this implies IA-32 is the architecture):
DSOs in /lib/tls need ABI version 2.4.20.
DSOs in /lib/i686 need ABI version 2.4.1.
DSOs in /lib need ABI version 2.2.5.

For the Red Hat releases this layout was chosen to provide the maximum
amount of backward compatibility for broken applications (correctly
written applications have no problems anyway). The code in /lib consists
of the very early LinuxThreads code which had fixed size threads which
could not be placed by the application. The version in /lib/i686 is the
LinuxThreads code which does away with this limitation (aka floating
stacks). The code in /lib/tls is the new NPTL POSIX thread library.

Thomas


On Tue, 2005-02-08 at 17:32, Jens Vagelpohl wrote:
> On Feb 8, 2005, at 17:55, Tres Seaver wrote:
> > |> I am wondering which version of glibc you have, or if you are using 
> > the
> > |> LD_ASSUME_KERNEL variable in any way?  Can you also tell me what 
> > your
> > |> ./configure command line looked like when you compiled Python?  I
> > have compiled
> > |> both 2.4 and 2.3.3 on the FC1 machine, but perhaps I left something
> > critical
> > |> out of the configuration.
> >
> > I don't do anything to touch LD_ASSUME_KERNEL, and my 'configure' is
> > bare-bones simple ('--prefix="/opt/zope" --enable-unicode="ucs2"').
> 
> I honestly don't remember where that whole "LD_ASSUME_KERNEL" stuff 
> originated, but it seems to be one of those myths that somehow never 
> die. I have used all kinds of RH/FC releases over the last 5 years and 
> it seems that LD_ASSUME_KERNEL was used for some other purpose, and 
> unfortunately it has reached complete FUD status as far as Python/Zope 
> is concerned now...
> 
> jens
> 
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