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Date: Tue, 21 Aug 2001 12:23:30 +0100
Subject: Re: AW: [C2] Loadtest 
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From: Stuart Roebuck <stuart.roebuck@adolos.co.uk>
To: cocoon-dev@xml.apache.org
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In-Reply-To: 
 <CCD084B0E779D411A70300508B6622260361F587@exchukahis02.experian.co.uk>
Message-Id: <F2C3705E-9626-11D5-8E29-0030654777A6@>

I mentioned something on the list a week ago about hash values being used 
as last modification dates.  This could still be a source of random delays 
in processing.  I've been tied up recently so I don't know if this has 
already been solved with the new Monitor code.  Here it is again:

On August 14, Stuart Roebuck wrote:
> In SitemapSource.java are the lines:
>
> // the event pipeline is cacheable
> // now calculate a last modification date
> String hashKey = pck.toString() + validity.toString();
> this.lastModificationDate = HashUtil.hash(hashKey);
>
> this is used in ProgramGeneratorImpl.java:
>
> /*
>  * FIXME: It's the program (not the instance) that must
>  * be queried for changes!!!
>  */
> if (programInstance != null && 
> programInstance.modifiedSince(source.getLastModified())) {
>   // Release the component.
>   release(programInstance);
>
> consequently, any use of the ServerPages Generator which takes an input 
> from within the sitemap (e.g. using a "cocoon:/" URI) will result in (on 
> a practically random basis) certain XSP (et. al) pages being regenerated 
> over and over again, and will potentially prevent updated XSP (et. al) 
> from being properly regenerated.


On Tuesday, August 21, 2001, at 09:43  am, Morrison, John wrote:

>
>
>> -----Original Message-----
>> From: Ovidiu Predescu [mailto:ovidiu@cup.hp.com]
>> Sent: Tuesday, 21 August 2001 9:22 am
>> To: Stefan Seifert
>> Cc: cocoon-dev@xml.apache.org
>> Subject: Re: AW: [C2] Loadtest
>>
>>
>> On Mon, 20 Aug 2001 23:33:28 +0200, "Stefan Seifert"
>> <sseifert@pro-vision.de> wrote:
>> Is your database running on the same machine with Cocoon? How much
>> time is spent executing the SQL queries? Maybe Cocoon is not the issue
>> here, but the database.
>>
>> Just an idea...
>
> Nice idea, but not true.  I have the following hardware:
>
> 1. Development (personal) box:
>  Webserver: Dual P2 300, 256M mem, several gig HDD, W2K, JDK 1.3.0, 
> Catalina
> b6
>  Database: using database from 2.
> 2. Development (testing) boxes:
>  Webserver: P3 600, 64M mem, enough HDD, NT4 sp 6a, JDK 1.3.0, IIS4 +
> ServletExec 3.1
>  Database:  P3 600, 64M mem, enough HDD, NT4 sp 6a, SQLServer 7 (unknown 
> sp)
> 3. QA (testing) boxes:
>  Webserver: P3 600, 64M mem, enough HDD, NT4 sp 6a, JDK 1.3.0, IIS4 +
> ServletExec 3.1
>  Database:  P3 600, 64M mem, enough HDD, NT4 sp 6a, SQLServer 7 (unknown 
> sp)
> 4. Deployment boxes:
>  Webserver: DL380 (733MHz), 1G mem, *plenty* HDD, NT4 sp 6a, JDK 1.3.0, 
> IIS4
> + ServletExec 3.1
>  Database:  DL320 (800MHz), 512M mem, *stacks* HDD, NT4 sp 6a, SQLServer 
> 7
> (unknown sp)
>
> The *same* set of files (the only thing that changes from system to system
> is config) have been placed on *all* of the above systems.  Response times
> from 1, 2, and 3 run from 47ms for simple, 'return this content' to a 
> couple
> of quite rough (select top1 ... order by date desc) sql queries which
> typically run between 100ms & 1sec.
>
> On 4 (the big mothers) response times are from 5 to 7 seconds.
>
> I can't *do* anything but watch the big boxes (no dev capabilities) and 
> the
> smaller boxes don't display the problem.  Help?  Suggestions?  I'm only
> serializing xml and I'm only using the xsp generator (some pages with, 
> some
> without esql) with no xslt in-between...
>
> I'm at a loss.  I *was* getting similar response times until I upgraded 
> the
> Cocoon release on the deployment boxes (I can't remember the version, but 
> I
> could (if necessary) find out) to current 2.1.  However, using the old
> release I was getting periodic slowdowns every 1.5 min for 30sec with a
> large(ish) concurrent hit.
>
> J.


-------------------------------------------------------------------------
Stuart Roebuck                                  stuart.roebuck@adolos.com
Lead Developer                               Java, XML, MacOS X, XP, etc.
ADOLOS                                           <http://www.adolos.com/>


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