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[important] validator.w3.org overloaded

From: olivier Thereaux <ot@w3.org>
Date: Mon, 15 Aug 2005 19:42:44 +0900
Message-Id: <8076de534e800e2c8f2dcaca4ce9c64b@w3.org>
To: WWW-Validator Community <www-validator@w3.org>

Dear all,

As many of you noticed, since the release of the Markup Validator's new 
version last week, the server validator.w3.org has had trouble honoring 
all validation requests in a reasonable time. This mail will try to 
summarize what we know, what we are doing to improve that situation, 
and what you too can do.

* Causes of the problem

In a nutshell: CPU load.

However not particularly slower than the previous versions, version 
0.7.0 of the validator introduces architectural changes that makes it 
easier to maintain and less bug-prone, but also a little heavier on the 
system. This means that in good conditions, the validator will run fast 
and smoothly, but when a lot (over 250) validation processes run at the 
exact same time, the server lacks CPU power, load skyrockets, and the 
system gets into a vicious circle of processes taking time to end, 
therefore being heavy on the system, etc, for approximately 10 hours a 
day on week days.

* What we are doing

We have been working very intensively around the clock (literally) to 
improve the situation, by:
- tweaking the system settings so that nothing hinders its primary 
- tracking broken scripts that are abusing the system
- preparing a 0.7.1 release with improved performance
- starting our next phase of development oriented toward 
modularization, and which should have direct (and positive) effects on 

* What you can do.

- be patient... Don't hit reload like crazy because validation results 
don't load.
- if you have batch scripts calling the validator, make sure they are 
set to sleep at the very least one or two seconds between requests.
- if you have batch scripts calling the validator, consider running 
them between 22:00 and 04:00 GMT, when the system load is very low.
- if you are a heavy user of the validator, such as a company or a web 
design agency, you may want to install the validator locally on your 
See: http://validator.w3.org/docs/install.html (there are also 
installation guides for Mac and Windows platforms)
- ... and you are of course welcome to help in the development of the 

Thank you all for your patience and cooperation.
Received on Monday, 15 August 2005 10:42:55 UTC

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