SEO

WP Super-Cache Not Deleting Expired Pages

Tips and Tips - Tue, 11/18/2008 - 20:14

I recently tweaked our blog template and was surprised to see a large number of pages were still displaying the old template! Obviously these pages were being displayed by WP Super-cache, but I had already deleted the wordpress cache, so how was it possible?

I was using the latest version of WP-super-cache 0.8.4 (like most wordpress users), a superb must-have plugin that provides a very fast caching module for WordPress, which means your site can easily survive a Digg on a shared server. When I checked the Supercache admin panel, it showed the counter stuck at 1183 expired files in supercache, and it would not change whatever you do.

WP-Supercache Not Deleting Expired Pages

After repeated attempts I simply could not delete the Super cache expired files - I tried turning the plugin on and off, tried to turn it half on (WP-cache only, Supercache disabled), supercache compression on and off, delete cache button, delete expired button… but nothing helped.

The first time I had installed WP-supercache a few months back, it was not caching pages, but I fixed the issue. This time however the problem refused to get fixed. I simply could not let 1183 frequently visited pages on the site show outdated pages with an older template.

Switch to Older Version of WP-Supercache

I realized the problem had occurred since I installed the latest version of WP-supercache recently by plugin autoupgrade. The changelog revealed some change was recently made to garbage collection timing. Someone suggested I try the WP Super Cache Cleaner WordPress plugin that will periodically delete expired super-cache files regardless of whether your blog has reached the “X requests” threshold. However, only expired “super-cached” files will be deleted and WP-Cache files won’t be affected.

Since it would take time before more users reported the issue, a bug was identified, and a new version released, I decided to switch back to the previous version. But where could I find the previous version of WP-supercache?

Fortunately wordpress plugin headquarters archive all older plugin versions. I found the older version of WP-Super-cache (0.8.3) there and downloaded it. Then after backing up my current WP-supercache folder from the server, I uploaded the older version. Then I reactivated the plugin, pressed delete cache and… Expired pages = 0

More Supercache Experiments

UPDATE: WP-super-cache stopped working again after switching back to an older version. Till then manually deleting the cache seemed to be the reasonable option to keep the site going. I then switched back to the latest version. And here is how I proceeded further.

Under wp-content/cache/supercache/ there were hundreds of folders. I deleted all of them, but some folders refused to get deleted and had strange triple backslashes.

I figured maybe these folders were causing the cache to get stuck. Since these folders were undeletable via my FTP client Filezilla, I had to login via Shell using puTTY and delete these folders. Once the Supercache folder was empty, I tried to deactivate and reactivate. Still not working.

Now based on my previous experiences I deleted advanced-cache.php link in wp-content. Then I temporarily gave 777 priveleges to wp-content, again deactivated and reactivated the plugin, a new advanced-cache.php was created automatically, switched back wp-content to 755 and behold - the caching started as normal.

This is my personal experience, I am no professional expert in this, try it at your own risk.

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Intel Core i7 Extreme: Fastest Processor Ever

Tips and Tips - Tue, 11/18/2008 - 19:47

Intel Corporation has launched its most advanced desktop processor ever called the Intel Core i7 processor. The first member of a new family of Nehalem processor designs, it speeds video editing, immersive games and other popular Internet and computer activities by up to 40 percent without increasing power consumption.

Intel Turbo Boost Technology automatically adjusts the clock speed of one or more of the four individual processing cores for single- and multi-threaded applications to boost performance. The Core i7 processor more than doubles the memory bandwidth of previous Intel “Extreme” platforms, speeding the transfer of computer bits and bites in and out of the processor with Intel Quickpath Technology. Intel’s Hyper-Threading Technology allows multiple computing threads to run simultaneously, effectively enabling it to do two things at once, so the Core i7 quad-core processor delivers 8-threaded performance.

Each Core i7 processor has an 8 MB level 3 cache and three channels of DDR3 1066 memory to deliver the best memory performance of any desktop platform. Intel’s top performance processor, the Intel Core i7 Extreme Edition, also removes overspeed protection, allowing further increase in the chip’s speed.

While Intel Core i7- 920 starts at $284, the top of the line Intel Core i7-965 Extreme Edition will cost $999. Now play Crysis like never before. Also take a peek at The Making of Intel Core i7 in this video -

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