http://florin.myip.org/
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08-26-2008, 04:14 PM
"Akemi Yagi"
slow Perl on CentOS 5
On Mon, Aug 25, 2008 at 1:30 PM, Florin Andrei <florin@andrei.myip.org> wrote:
> If your Perl apps are unusually slow on CentOS 5, have a look at this blog:
>
> http://blog.vipul.net/2008/08/24/redhat-perl-what-a-tragedy/
>
> In a nutshell: some Perl apps are 100x slower on RedHat / CentOS 5 compared
> to other distributions.
>
> Bugzilla entry:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=379791
> --
> Florin Andrei
Just forwarding a posting on the Scientifix Linux mailing list that is
addressing the same perl issue and calling for collaborative effort
with CentOS.
Akemi
======= forwarded message =======
Date: Tue, 26 Aug 2008 08:58:40 -0700
Sender: Mailling list for Scientific Linux users worldwide
From: Keith Lofstrom
Subject: Horribly Broken RHEL5/SL5 Perl
Comments: To: Scientific Linux
This just in: http://blog.vipul.net/2008/08/24/redhat-perl-what-a-tragedy/
Summary: The Upstream Vendor version of Perl has a patch to the
"bless[]" function that makes it /extremely/ slow. Most of us do not
write that kind of of fancy Perl, but a lot of us use one of the 1500+
CPAN modules that do. The slowdown can be over 100x with some
programs. This affects Fedora 9 as well as the various version 5
distros. TUV-patched Perl version 5.8.8 also breaks the Math::GSL
package that I wrote about a few days ago. It runs fine with 5.10 .
What to do? Some people are downloading and recompiling Perl;
we have version 5.8.8, while version 5.10 is available . A few are
abandoning Perl. A few are abandoning TUV-inspired distros. A few
are buying way more hardware than they would otherwise need.
Since some of the scientific community (especially the life sciences)
are running huge amounts of Perl, this is probably a Big Deal. We
should explore the problem further with TUV and the CentOS
community. If a fix is not forthcoming from TUV, I reluctantly suggest
that we get together with the CentOS people and fork this portion of
the distro, perhaps standardizing on Perl 5.10 . There are people
in the Perl community ready to assist us.
Keith
--
Keith Lofstrom [log in to unmask] Voice (503)-520-1993
KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon"
Design Contracting in Bipolar and CMOS - Analog, Digital, and Scan ICs
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08-26-2008, 09:08 PM
Karanbir Singh
slow Perl on CentOS 5
Akemi Yagi wrote:
On Mon, Aug 25, 2008 at 1:30 PM, Florin Andrei <florin@andrei.myip.org> wrote:
If your Perl apps are unusually slow on CentOS 5, have a look at this blog:
on 8-26-2008 2:08 PM Karanbir Singh spake the following:
Akemi Yagi wrote:
On Mon, Aug 25, 2008 at 1:30 PM, Florin Andrei
<florin@andrei.myip.org> wrote:
If your Perl apps are unusually slow on CentOS 5, have a look at this
blog:
Summary: The Upstream Vendor version of Perl has a patch to the
"bless[]" function that makes it /extremely/ slow.
Reliable info heard on the grapevine indicates 5.3 would have the fix's
required.
So that means about 6 months away from a fix?
--
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You hope everybody uses it, and
you notice quickly if they don't!!!!
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08-26-2008, 09:27 PM
"Stephen John Smoogen"
slow Perl on CentOS 5
On Tue, Aug 26, 2008 at 3:11 PM, Scott Silva <ssilva@sgvwater.com> wrote:
> on 8-26-2008 2:08 PM Karanbir Singh spake the following:
>>
>> Akemi Yagi wrote:
>>>
>>> On Mon, Aug 25, 2008 at 1:30 PM, Florin Andrei <florin@andrei.myip.org>
>>> wrote:
>>>>
>>>> If your Perl apps are unusually slow on CentOS 5, have a look at this
>>>> blog:
>>>>
>>>> http://blog.vipul.net/2008/08/24/redhat-perl-what-a-tragedy/
>>>
>>> Summary: The Upstream Vendor version of Perl has a patch to the
>>> "bless[]" function that makes it /extremely/ slow.
>>
>> Reliable info heard on the grapevine indicates 5.3 would have the fix's
>> required.
>>
> So that means about 6 months away from a fix?
>
Unless upstream bundles a hotfix that is available for people...
--
Stephen J Smoogen. -- BSD/GNU/Linux
How far that little candle throws his beams! So shines a good deed
in a naughty world. = Shakespeare. "The Merchant of Venice"
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08-26-2008, 11:15 PM
"Akemi Yagi"
slow Perl on CentOS 5
On Tue, Aug 26, 2008 at 2:08 PM, Karanbir Singh <mail-lists@karan.org> wrote:
> Akemi Yagi wrote:
>>
>> On Mon, Aug 25, 2008 at 1:30 PM, Florin Andrei <florin@andrei.myip.org>
>> wrote:
>>>
>>> If your Perl apps are unusually slow on CentOS 5, have a look at this
>>> blog:
>>>
>>> http://blog.vipul.net/2008/08/24/redhat-perl-what-a-tragedy/
>>
>> Summary: The Upstream Vendor version of Perl has a patch to the
>> "bless[]" function that makes it /extremely/ slow.
>
> Reliable info heard on the grapevine indicates 5.3 would have the fix's
> required.
> --
> Karanbir Singh : http://www.karan.org/ : 2522219@icq
Actually, this is stated in the upstream bugzilla Florin referred to:
However, according to the bugzilla, their fix is still not perfect and
they are "working on it" (as of today).
Akemi
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08-27-2008, 04:18 AM
Mark Pryor
slow Perl on CentOS 5
hello,
--- On Tue, 8/26/08, Stephen John Smoogen <smooge@gmail.com> wrote:
> From: Stephen John Smoogen <smooge@gmail.com>
> Subject: Re: [CentOS] Re: slow Perl on CentOS 5
> To: "CentOS mailing list" <centos@centos.org>
> Date: Tuesday, August 26, 2008, 2:27 PM
> On Tue, Aug 26, 2008 at 3:11 PM, Scott Silva
> <ssilva@sgvwater.com> wrote:
> > on 8-26-2008 2:08 PM Karanbir Singh spake the
> following:
> >>
> >> Akemi Yagi wrote:
> >>>
> >>> On Mon, Aug 25, 2008 at 1:30 PM, Florin Andrei
> <florin@andrei.myip.org>
> >>> wrote:
> >>>>
> >>>> If your Perl apps are unusually slow on
> CentOS 5, have a look at this
> >>>> blog:
> >>>>
> >>>>
> http://blog.vipul.net/2008/08/24/redhat-perl-what-a-tragedy/
> >>>
> >>> Summary: The Upstream Vendor version of Perl
> has a patch to the
> >>> "bless[]" function that makes it
> /extremely/ slow.
> >>
> >> Reliable info heard on the grapevine indicates 5.3
> would have the fix's
> >> required.
> >>
> > So that means about 6 months away from a fix?
> >
>
> Unless upstream bundles a hotfix that is available for
> people...
>
>
Anyone want to try and get this built on C5.2?
ftp://download.fedora.redhat.com/pub/fedora/linux/updates/8/SRPMS/perl-5.8.8-40.fc8.src.rpm
I've tested it out via the fc8 live CD and the bless/overload bug is absent.
------------- bug test ----------
#!/usr/bin/perl
use overload q(<) => sub {};
my %h;
for (my $i=0; $i<50000; $i++) {
$h{$i} = bless [ ] => 'main';
print STDERR '.' if $i % 1000 == 0;
}
----------------- end snip ------------
the above runs in about .4 sec, while on C5.2 it takes 8-12 seconds.
--
Mark
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08-27-2008, 07:00 AM
Vnpenguin
slow Perl on CentOS 5
On Wed, Aug 27, 2008 at 6:18 AM, Mark Pryor <tlviewer@yahoo.com> wrote:
>
> Anyone want to try and get this built on C5.2?
> ftp://download.fedora.redhat.com/pub/fedora/linux/updates/8/SRPMS/perl-5.8.8-40.fc8.src.rpm
>
> the above runs in about .4 sec, while on C5.2 it takes 8-12 seconds.
>
Can not wait for update, I have to build Perl 5.10.0 from src for my
work on CentOS 5.2. I installed this into /opt/perl for now, so there
is no impact on rpm Perl package.
Waiting for fixed rpm of Perl ...
--
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08-27-2008, 08:39 AM
Karanbir Singh
slow Perl on CentOS 5
Akemi Yagi wrote:
should explore the problem further with TUV and the CentOS
community. If a fix is not forthcoming from TUV, I reluctantly suggest
that we get together with the CentOS people and fork this portion of
the distro, perhaps standardizing on Perl 5.10 . There are people
in the Perl community ready to assist us.
While forking the whole perl subsection of the distro is a bit drastic,
I am quite happy to have a perl in C5Plus. Does someone want to get in
touch with Keith and get a summary on what needs fixing in this case ?
Also - if the conversation was to take place on centos-devel list, would
be much cooler.
Upstream have said the fix will be in 5U3, and considering that might be
still a few months away, could we get something sorted before then ?
Transferred to centos-devel to fulfill Karanbir's wish (see below).
---------- Forwarded message ----------
From: Karanbir Singh <kbsingh@centos.org>
Date: Wed, Aug 27, 2008 at 1:39 AM
Subject: Re: [CentOS] slow Perl on CentOS 5
To: CentOS mailing list <centos@centos.org>
Akemi Yagi wrote:
>
> should explore the problem further with TUV and the CentOS
> community. If a fix is not forthcoming from TUV, I reluctantly suggest
> that we get together with the CentOS people and fork this portion of
> the distro, perhaps standardizing on Perl 5.10 . There are people
> in the Perl community ready to assist us.
While forking the whole perl subsection of the distro is a bit
drastic, I am quite happy to have a perl in C5Plus. Does someone want
to get in touch with Keith and get a summary on what needs fixing in
this case ? Also - if the conversation was to take place on
centos-devel list, would be much cooler.
Upstream have said the fix will be in 5U3, and considering that might
be still a few months away, could we get something sorted before then
?
( questions, since I dont use perl myself )
--
Karanbir Singh
CentOS Project { http://www.centos.org/ }
irc: z00dax, #centos@irc.freenode.net
-------- End of Forwarded message -------
There was an additional post to the same SL M/L thread which has a
link relevant to fixing the broken RH perl.
http://use.perl.org/~nicholas/journal/37274
Akemi
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slow Perl on CentOS 5
