/ 
Apache-LoadAvgLimit-0.02_02
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/ Apache::LoadAvgLimit

NAME

Apache::LoadAvgLimit - limiting client request by system CPU load-averages

SYNOPSIS

in httpd.conf, simply

<Location /perl>
  PerlInitHandler Apache::LoadAvgLimit
  PerlSetVar LoadAvgLimit 2.5
</Location>

or fully

<Location /perl>
  PerlInitHandler Apache::LoadAvgLimit
  PerlSetVar LoadAvgLimit_1 3.00
  PerlSetVar LoadAvgLimit_5 2.00
  PerlSetVar LoadAvgLimit_15 1.50
  PerlSetVar LoadAvgRetryAfter 120
</Location>

DESCRIPTION

If system load-average is over the value of LoadAvgLimit*, Apache::LoadAvgLimit will try to reduce the machine load by returning HTTP status 503 (Service Temporarily Unavailable) to client browser.

Especially, it may be useful in <Location> directory that has heavy CGI, Apache::Registry script or contents-handler program.

PARAMETERS

LoadAvgLimit

When at least one of three load-averages (1, 5, 15 min) is over this value, returning status code 503.

LoadAvgLimit_1, LoadAvgLimit_5, LoadAvgLimit_15

When Each minute's load-averages(1, 5, 15 min) is over this value, returning status code 503.

LoadAvgRetryAfter

The second(s) that indicates how long the service is expected to be unavailable to browser. When this value exists, Retry-After field is automatically set.

AUTHOR

Okamoto RYO <ryo@aquahill.net>

SEE ALSO

mod_perl(3), Apache(3), getloadavg(3), uptime(1), RFC1945, RFC2616