[wp-hackers] Paged Comments and Memory Usage

Martin Lazarov martin at lazarov.bg
Tue Feb 14 12:59:50 UTC 2012

I don't have answer for you question (for comments)

Using <!--nextpage--> doesn't split post to more parts (database
rows), so querying it from the database always returns whole post
(containing all the pages).

On Tue, Feb 14, 2012 at 2:33 PM, David Law
<wp-hackers at google-adsense-templates.co.uk> wrote:
> Ran into an interesting issue.
> Moved a very popular domain over the weekend from one virtual
> dedicated server that was struggling to a new one (Centos 5.6, control
> panel Virtualmin).
> On the old server (same basic setup) I'd changed various PHP and MySQL
> settings, on the new one I'd not made any changes from the default
> settings.
> The posts with above 2,000 comments (6 posts) were broken, the page
> was loading up to where comments are loaded, so the pages were
> truncated.
> Checked the error logs and had loads of these errors:
> [Mon Feb 13 11:03:43 2012] [error] [client *******] PHP Fatal error:
> Allowed memory size of 33554432 bytes exhausted (tried to allocate 35
> bytes) in /home/*******/public_html/wp-includes/comment.php on line
> 1941, referer: **********
> Basically the comments weren't loading at all so the page was
> truncated below the main content.
> I changed allowed memory to 64mb and the pages load now.
> I have the site set to paged comments, the post with 8,000 comments is
> paged over 132 pages for example.
> Relevant discussion settings are:
> Enable threaded 10 levels deep
> Break comments into pages, 20 top level
> I'd assumed WordPress would only access the comments that are loaded
> on the page, so if I go to comments paged 27 and it's got 50 comments
> in total only those 50 comments are accessed, but this issue suggests
> a lot more than the comments shown in a browser are accessed and this
> is using a lot of memory.
> Are all comments for a post accessed when a page is loaded?
> If so any ideas to reduce the load?
> I ran into a similar issue a few years back, I wanted to use the
> <!--nextpage-->  WordPress feature for a public domain books site,
> wanted to upload entire books as a post and split them using nextpage
> but the entire book (some books several MBs in size) was accessed each
> page load and it would timeout.
> David
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