[ic] Upgrade to Interchange-5.7.4 performance issues

Bill Carr bill at bottlenose-wine.com
Fri Feb 12 14:18:46 UTC 2010

On Feb 12, 2010, at 2:03 AM, Gert van der Spoel wrote:

>> -----Original Message-----
>> From: interchange-users-bounces at icdevgroup.org [mailto:interchange-
>> users-bounces at icdevgroup.org] On Behalf Of Bill Carr
>> Sent: Friday, February 12, 2010 1:00 AM
>> To: interchange-users at icdevgroup.org
>> Subject: Re: [ic] Upgrade to Interchange-5.7.4 performance issues
>> On Feb 11, 2010, at 10:50 AM, Bill Carr wrote:
>>> On Feb 11, 2010, at 10:34 AM, David Christensen wrote:
>>>> On Feb 11, 2010, at 1:10 AM, Jon Jensen wrote:
>>>>> On Wed, 10 Feb 2010, Bill Carr wrote:
>>>>>> However, 5.7.4 runs much slower. Pages that get served on in under
>> 5 seconds are taking 10, 20, 30 seconds or longer. The load average on
>> each host running 5.7.4 goes from under 2 to near 10. I'm running the
>> rpc mode from interchange.cfg.dist. Configuration is the same for 5.4.0
>> and 5.7.4 (besides small changes with actionmap api). I know 5.7.4 is
>> not a production release. I'm just trying to bring my setup up to date.
>> Been running a hacked up 5.4.0 for a while.
>>>>>> Any ideas on why this would be or how I should debug it?
>>>>> I haven't seen any slowdowns like that. My best guess would be that
>> it's related to the new character set encoding stuff. What UTF8-related
>> directives or variables do you have?
>>>> There have been reports of slower regexes in some cases when using
>> UTF8 strings; in particular unanchored regexes like /.*foo/ will
>> sometime take a much longer time to process.  (The IC parser is made
>> almost exclusively of regexes, many of which fall into this category.)
>> I believe this is a perl bug, but I'm not sure if this has been fixed
>> in later perl versions or not.  What version of Perl/Encode are you
>> using?
>>> perl v5.10.0 built for x86_64-linux
>>> Encode 2.39
>>>> As a workaround, you can disable the MV_UTF8 as mentioned upthread,
>> or try a newer Perl version to see if it has been solved there.
>>> I had this disabled initially and it still went slow.
>>> I'll try perl 5.10.1 now.
>> I upgraded perl to 5.10.1 and running IC 5.7.4 seemed a little better
>> but still problematic. Several pages would be served up very quickly
>> but then there would be a page that took 10, 20, 30 seconds or more.
>> Then it would go quickly again.
>> My load balancer (LVS/ldirecrtor) calls a test page every 10 seconds
>> and it was getting timeouts on the test page and removing the real
>> server from the virtual server pool bringing down our application. This
>> does not happen with 5.4.0. The test page is very basic and I call it
>> with mv_tmp_session=1. When I called the test page from the LVS box
>> using wget it would take 30 seconds or so to return. Subsequent calls
>> of the test page came back almost instantly. Then  I would get a slow
>> one again.
> Are you using timed-build  for some items on your pages?
> That could explain the once in a while slow - when it rebuilds the part
> created with [timed-build].
> It sounds like a very specific problem and I can only suggest to take that
> test page and start reducing it into smaller bits and pieces and then run
> the test on that and see if there are any calls that take longer. If it
> stays the same then you quite likely removed the part that caused the
> problem.
This is the entire test page:

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Bill Carr 
Bottlenose - Wine & Spirits eBusiness Specialists 
(413) 584-0400 
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