[pmwiki-users] pmwiki.org performance

Patrick R. Michaud pmichaud at pobox.com
Wed Mar 15 13:45:51 CST 2006

On Wed, Mar 15, 2006 at 06:56:14PM +0100, Sebastian Pipping wrote:
> At the moment surfing pmwiki.org is significantly slower
> than it was a few (say two) days ago. Am I the only one
> with this impression?

A couple of days ago my webhosting provider "upgraded" the software
and kernel that is running my virtual private server.

It was fine the first day, but since then I've had a lot of
issues with server load, and I'm still tracking them down.  I
do know the following:

- mailman and exim on my server don't seem to be tuned very well,
  because each message to the pmwiki-users list generates
  dozens of exim processes, which instantly drive up the
  server load by quite a bit.  Exim in particular doesn't
  seem to be able the amount of traffic we generate.

- One of either mailman or exim was having trouble with locking
  of some sort, which was also increasing the load.

- The site is being hammered by search engine spiders.
  Here are stats for March 10th to the present:

  Total number of hits to pmwiki.org :  457,339  (100.0%)
  Hits coming from Slurp (Yahoo!)    :   84,008  ( 18.4%)
  Hits coming from Googlebot         :   30,945  (  6.8%)
  Hits coming from msnbot            :   18,615  (  4.1%)

  In short, about 30% of the traffic coming to pmwiki.org
  is coming from search engine robots, and the sheer numbers
  of hits are starting to have an effect.  I'm even considering
  some judicious blocks on Yahoo!'s spiders.


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