ezimage.tpl takes atleast 8 seconds to load making site slow

Saturday 06 August 2011 11:14:58 am

Reply from my hosting provider as follows

"issue is caused by the conversion module of the application. Once you try to load an image the following scripts are executing on the server :
 
 749613 alnahdha 21 0 208m 7952 1716 R 100.0 0.0 0:02.90 /usr/bin/convert var/ezflow_site/storage/images/events/ez-awa
 749606 alnahdha 16 0 258m 34m 9104 S 0.0 0.1 0:00.19 lsphp5:/home/alnahdha/public_html/index.php
 
 Note that the convert process is using 100 % of the CPU on the server. I would kindly advice you to check with the developers of the script for the issue as they might be able to give you a solution. Another solution that we may offer you is to upgrade your account to one of our dedicated servers or VPS so you will be able to use all of the server resources just for your site."

I will be thankfull for any help

Sunday 07 August 2011 10:57:14 pm

Romeo,

You might check your template code for endless loops/endless template calls. I've seen a case where an endless loop involving ImageMagick ruined a server's day.

Granite Horizon, Certified Developer of eZ Publish Web Solutions
Provider of the SaaS Solution Granite Horizon In The Cloud | http://granitehorizon.com/cloud
http://granitehorizon.com | +1 916 647 6350 | California USA | @granitegreg
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Monday 08 August 2011 1:58:14 am

Imagemagick going to 100% CPU can be caused by a variety of factors:

Is the machine underpowered for your site - does it have multiple CPUs allocated?

Do you have enough memory for your site?

Are the uploaded files huge?  like 2000x1000 and 10MB each?  Imagemagick takes a long time if the images are big.

Are your aliases really complicated, are there a lot of aliases, are they optimized - i.e. - do you scale them down and then use the scaled image as the reference before doing something else like adding rounded corners?

Is your caching right? Or, are you clearing your caches right?   Your image aliases should only be generated when an object is created or updated and someone visits a page that needs that image alias.  Meaning, if you have 100s of converts running at once then I think something went wrong with the caching.   Even ezcache.php --clear-all shouldn't clear your image aliases.  Actually, let me guess... you only clear the cache from the backend and then you clear all.

If that is the case then maybe you want to comment this section of kernel/classes/ezcache.php out on your production machine:

 /* Hack ARE IMAGE ALIASES CAUSING SLOWDOWN AFTER CLEAR ALL
                                array( 'name' => ezpI18n::tr( 'kernel/cache', 'Image alias' ),
                                       'id' => 'imagealias',
                                       'tag' => array( 'image' ),
                                       'path' => false,
                                       'enabled' => true,
                                       'function' => array( 'eZCache', 'clearImageAlias' ),
                                       'is-clustered' => true ),
*/

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Monday 08 August 2011 3:02:10 am

"Is the machine underpowered for your site - does it have multiple CPUs allocated"

There are  ezpublish sites already hosted in this server. And working perfect . That is what support teams says.   No idea about multiple CPU used or not

Are the uploaded files huge?  like 2000x1000 and 10MB each? Are the uploaded files huge?  like 2000x1000 and 10MB each?

I am only testing with sample data of ezflow package. No content objects created with image datatype.

.Caching everything perfect.

Usually  I test image loading time,  by clear the cache from the backend and then you clear all.

"If that is the case then maybe you want to comment this section of kernel/classes/ezcache.php out on your production machine: "

 <span style="color: #808080; font-style: italic;">/* Hack ARE IMAGE ALIASES CAUSING SLOWDOWN AFTER CLEAR ALL
                                array( 'name' => ezpI18n::tr( 'kernel/cache', 'Image alias' ),
                                       'id' => 'imagealias',
                                       'tag' => array( 'image' ),
                                       'path' => false,
                                       'enabled' => true,
                                       'function' => array( 'eZCache', 'clearImageAlias' ),
                                       'is-clustered' => true ),
*/</span>

by commenting out above array values, I can save uption 25% time in loading pages after clear all caches from admin.

That is what the results shows Steven.

But still some issues in image loading time . image magic version should be 6.4.x

shared hsoting using 6.2.8  .Will this be the issue?

Monday 08 August 2011 3:38:01 am

I am only using

Filters[]=geometry/scalewidth
Filters[]=geometry/crop

from image magic.  No advanced features.

So I think this will not be a matter whatver version of image magic .

Anyway thanks a lot for the help Steven

Sunday 14 August 2011 4:07:42 am

Solved.  I was using imagemagic 6.2.8 , changed it into 6.4.x and the issues sorted

Regards

Romeo