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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 41111] - New option for filters: run only if there are spare CPU cycles
Date Wed, 06 Dec 2006 20:20:35 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=41111





------- Additional Comments From apache@harkless.org  2006-12-06 12:20 -------
Ah yes, I think I did see a reference to mod_load_average some time back when I
was researching Apache throttling options, but I'd forgotten about it.  Seems to
be undocumented and not supported by its author, though.  It's not featured with
his other modules on http://www.outoforder.cc/, for instance.

Sounds good to make this general-purpose for filters.

Thanks for the pointer to mod_cache.  It might be good to add a note about it to
the mod_deflate documentation, as it wouldn't necessarily be obvious to people
who aren't experts on Apache internals that it would cache output from
mod_deflate so it wouldn't have to be recompressed next time.  I was confused as
to how caching would work with mod_deflate (without having a separate caching
proxy instance) -- for instance, a lot of the stuff I read online (outside of
httpd.apache.org) about it claimed it did its *own* caching, but I couldn't find
any evidence of that in the documentation.

Yes, good point about "instantaneous CPU usage", a la 'top', being a misnomer,
since clearly it has to average over some time period to be meaningful -- it's
just a shorter time period than with load averages, without any extra factors
thrown in to the calculation, and expressed in terms of an easy to understand
0-100%, rather than load averages which can go arbitrarily high.  And yeah, I
hadn't really thought about this on Windows -- load averages would be even
harder to understand for Windows jockeys.

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