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Author Topic: DOMPDF Eating up CPU  (Read 15368 times)

Hershel

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DOMPDF Eating up CPU
May 04, 2011, 12:43:27 pm
On a Drupal 6 site that was just upgraded to CiviCRM 3.4, when someone registers for an event, the process eventually dies on a 500 error. We investigated it, and identified that the problematic module is DOMPDF. It appears to hang without being able to complete successfully.

There is an xdebug.txt file here civihosting.com/sites/default/files/xdebug.txt.zip if anyone wants to have a look at it.
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Donald Lobo

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Re: DOMPDF Eating up CPU
May 04, 2011, 01:22:49 pm

This has come up a few times and would be great if someone can help provide a patch to make the PDF generation and receipt attachment optional. it should not be too hard to do so (maybe a 4-8 hour project)

sorry, i dont think any of us know a lot about DOMPDF to help in that. the dompdf forums might be a better place

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Eileen

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Re: DOMPDF Eating up CPU
May 04, 2011, 02:35:54 pm
Hershel, I dug into this a bit (before giving up once) but got the impression that your html matters a lot to dompdf - I think that it has to calculate column width on the tables & loads up all the pdf data before it can start on that.
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Eileen

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Re: DOMPDF Eating up CPU
May 04, 2011, 02:36:32 pm
nb - same template - different civi version stopped it working?
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Hershel

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Re: DOMPDF Eating up CPU
May 05, 2011, 03:01:39 am
Quote from: Eileen on May 04, 2011, 02:36:32 pm
nb - same template - different civi version stopped it working?

Correct. I think they were using registrations in the previous version. I'm pretty sure.
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xavier

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Re: DOMPDF Eating up CPU
May 05, 2011, 04:31:53 am
Might be worthwhile asking in dompdf forums/mailing list. Presumably they know the best practice and what to do/not to do to avoid using too much memory?

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Hershel

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Re: DOMPDF Eating up CPU
May 05, 2011, 04:36:27 am
I posted an issue there.
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FatherShawn

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Re: DOMPDF Eating up CPU
May 08, 2011, 06:34:42 am
I'm really intrigued by the potential of this new Drupal PDF module, epspecially the savings of  not rendering much of the page on each receipt due through template merging:  http://drupal.org/project/views_pdf
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Hershel

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Re: DOMPDF Eating up CPU
May 11, 2011, 10:32:36 am
They posted a response at http://code.google.com/p/dompdf/issues/detail?id=277 :

Quote
Would you be able to update to the latest 0.6.0 beta? Lots of changes have been made since the Helmut release.

If you can post a sample of the HTML being rendered that would help determining what's going on. Just FYI, the most typical cause of 500 errors on simple documents is a table cell larger than a single page.

We'll take a look at the xdebug.txt when we get a chance to see if there's anything of note.
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Donald Lobo

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Re: DOMPDF Eating up CPU
May 11, 2011, 01:28:09 pm

hershel:

can u do a local upgrade to 0.6.beta on your civicrm packages directory and see how it goes

lobo
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Hershel

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Re: DOMPDF Eating up CPU
May 16, 2011, 10:34:48 am
Tried that but unfortunately didn't solve the problem. :(
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Donald Lobo

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Re: DOMPDF Eating up CPU
May 16, 2011, 11:19:54 am

any interest from anyone to submit a patch that makes the PDF attachment optional for event reg / contributions. To begin with it could just be a global configuration option that is enabled by default, but can be turned off.

At a later stage, would be nice to make it a setting for all "public" pages that send an email. But that will require a DB change and is a wee bit more complex

We can help u'll out with this patch on IRC. A great easy project to get started with

lobo
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Hershel

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Re: DOMPDF Eating up CPU
May 16, 2011, 11:59:04 am
The dompdf guy said

Quote
DOMPDF 0.6.0 will return the working HTML document as a string if you call $dompdf->output_html().

Can you tell me whereabouts I could do that and I will try ? Perhaps that could help point us in the direction, in the meantime. :)
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Donald Lobo

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Re: DOMPDF Eating up CPU
May 16, 2011, 01:00:26 pm

CRM/Core/BAO/MessageTemplates.php, function sendTemplate

search for PDFFileName

Seems like sending a PDF receipt might be more easily encapsulated as a column in the message template table

You can add a config variable in the Admin screens, maybe under:

CRM/Admin/Form/Setting/Miscellaneous.php. But maybe fixing message templates schema might be a better thing to do

lobo


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majortom

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Re: DOMPDF Eating up CPU
May 18, 2011, 07:17:53 am
Hershel -
   Have you figured out any work around? Does upgrading to drupal 7/CiviCRM 4 fix the problem?
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