Comments on: Memcached and WordPress MU http://heisel.org/blog/2009/09/19/memcache-wordpress/ Musings for those in the media who grok, grep, and otherwise get the Web. Mon, 05 Mar 2012 15:21:00 +0000 hourly 1 http://wordpress.org/?v=3.1.3 By: Scott http://heisel.org/blog/2009/09/19/memcache-wordpress/comment-page-1/#comment-33175 Scott Sun, 08 Aug 2010 03:24:51 +0000 http://heisel.org/blog/?p=1483#comment-33175 <p>Hi Chris, Thanks for posting this. I have an issue with this it seems to work for a bit (I see the cached info before the head) then it just stops the memcache server is still alive so that is not the issue. I also see SEGFAULT errors as soon as I disable the segfaults disappear?</p> Hi Chris, Thanks for post­ing this. I have an issue with this it seems to work for a bit (I see the cached info before the head) then it just stops the mem­cache server is still alive so that is not the issue. I also see SEG­FAULT errors as soon as I dis­able the seg­faults disappear?

]]> By: Chris Heisel http://heisel.org/blog/2009/09/19/memcache-wordpress/comment-page-1/#comment-33066 Chris Heisel Wed, 24 Feb 2010 13:06:58 +0000 http://heisel.org/blog/?p=1483#comment-33066 <p>Alex,</p> <p>Glad you figured that out! Batcache, and I believe Super Cache both serve non-cached pages to logged in users.</p> Alex,

Glad you fig­ured that out! Bat­cache, and I believe Super Cache both serve non-​cached pages to logged in users.

]]> By: Alex http://heisel.org/blog/2009/09/19/memcache-wordpress/comment-page-1/#comment-33065 Alex Wed, 24 Feb 2010 12:55:22 +0000 http://heisel.org/blog/?p=1483#comment-33065 <p>Finally, I've found the root of the problem, batcache doesn't serve pages for connected users :)</p> Finally, I’ve found the root of the prob­lem, bat­cache doesn’t serve pages for con­nected users :)

]]> By: Alex http://heisel.org/blog/2009/09/19/memcache-wordpress/comment-page-1/#comment-33064 Alex Wed, 24 Feb 2010 04:11:21 +0000 http://heisel.org/blog/?p=1483#comment-33064 <p>Hi,</p> <p>Thanks for your tutorial, t's the most complete I've found yet with all the steps to install memcache on wpmu (might be missing a bit of info on memcache install, but I'm sure people can figure it out).</p> <p>I cant succeed in getting the stats in my source code, I suppose the system is not working on my side, did you have a similar problem during your install? do you know a place where I can put a flag to debug the problem?</p> <p>Thanks a lot :)</p> <p>Alex</p> Hi,

Thanks for your tuto­r­ial, t’s the most com­plete I’ve found yet with all the steps to install mem­cache on wpmu (might be miss­ing a bit of info on mem­cache install, but I’m sure people can figure it out).

I cant suc­ceed in get­ting the stats in my source code, I sup­pose the system is not work­ing on my side, did you have a sim­i­lar prob­lem during your install? do you know a place where I can put a flag to debug the problem?

Thanks a lot :)

Alex

]]> By: Eric Bates http://heisel.org/blog/2009/09/19/memcache-wordpress/comment-page-1/#comment-32366 Eric Bates Thu, 12 Nov 2009 17:40:01 +0000 http://heisel.org/blog/?p=1483#comment-32366 <p>One issue that we ran into recently had to do with hash values across multiple memcached servers. We noticed that one of the cached objects wasn't updating memcached. We found that the hashes for that object were different on each of our memcached servers. This probably happened when one of the servers became unresponsive and temporarily dropped out of the pool. The default setting for PECL_MEMCACHED uses a "standard" hashing algorithm which works fine for single-server implementations. But when using multiple memcached servers, you're better off switching to a consistent hashing algorithm which will retain the object's hash key across multiple servers.</p> One issue that we ran into recently had to do with hash values across mul­ti­ple mem­cached servers. We noticed that one of the cached objects wasn’t updat­ing mem­cached. We found that the hashes for that object were dif­fer­ent on each of our mem­cached servers. This prob­a­bly hap­pened when one of the servers became unre­spon­sive and tem­porar­ily dropped out of the pool. The default set­ting for PECL_MEMCACHED uses a “standard” hash­ing algo­rithm which works fine for single-​server imple­men­ta­tions. But when using mul­ti­ple mem­cached servers, you’re better off switch­ing to a con­sis­tent hash­ing algo­rithm which will retain the object’s hash key across mul­ti­ple servers.

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