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Re: Snow Leopard, Apache 2.2, Skewed Load Balancing?
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Re: Snow Leopard, Apache 2.2, Skewed Load Balancing?


  • Subject: Re: Snow Leopard, Apache 2.2, Skewed Load Balancing?
  • From: Chuck Hill <email@hidden>
  • Date: Tue, 25 May 2010 13:46:00 -0700


On May 25, 2010, at 1:30 PM, Anjo Krank wrote:

~300 Transactions and 4-50 Sessions are, like, nothing if your instance is up for more than 5 mins?

It was just a quick picture...

How could I have known :)

The distribution is the same after 100s of sessions and thousands of transactions.



All it takes is one users looking at a lot of pages to skew these figures.

That would skew the # of transactions, yes. But it should not skew the creation of new sessions across instances. It is the session allocation that is problematic, IMO.

Yeah, but from your figures, you might have simply had a few long runners and a few quick exiters.

That does not explain the allocation of new sessions primarily to instances 1, 3 and 5.



Can you try "ab"? This should show things with more accurate numbers.

ab -n 500 http://whereever

What would that show relevant to the woadaptor load balancer choosing instances for requests without a woinst cookie or number in the URL? I'm confused.



Apart from that, I dimly remember the host and port setting also influenced the load distribution.

For Round Robin, it follows the instance order of configuration. If you configure all the instances on Server A, then the ones on Server B, then C, it will load up Server A first. You need to interleave the configurations. Is that what you were thinking of?

Yeah right. One trick was to number the instances not <host><port> but <port><host>.


Interesting idea.  I thought it went by instance number.



Chuck

--
Chuck Hill             Senior Consultant / VP Development

Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects








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  • Follow-Ups:
    • Re: Snow Leopard, Apache 2.2, Skewed Load Balancing?
      • From: Anjo Krank <email@hidden>
References: 
 >Snow Leopard, Apache 2.2, Skewed Load Balancing? (From: Chuck Hill <email@hidden>)
 >Re: Snow Leopard, Apache 2.2, Skewed Load Balancing? (From: Anjo Krank <email@hidden>)
 >Re: Snow Leopard, Apache 2.2, Skewed Load Balancing? (From: Chuck Hill <email@hidden>)
 >Re: Snow Leopard, Apache 2.2, Skewed Load Balancing? (From: Anjo Krank <email@hidden>)

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