Hi,
Thanks for the links! But. I wasnt sure what in the first link
was useful for this problem, and, the vacuum bots discussion
is really a different topic.
I'm not talking of vacuum bot load. This is real world load.
Practical experiments (ok - the live site :) convinced me that
the well recommended modperl setup of fe/be suffer from failure
and much wasted page production when load rises just a little
above *maximum sustainable throughput* ..
If you want to see what happens to actual output when this
happens, check this gif:
http://www.dslreports.com/front/eth0-day.gif
>From 11am to 4pm (in the jaggie middle secton delineated by
the red bars) I was madly doing sql server optimizations to
get my head above water.. just before 11am, response time
was sub-second. (That whole day represents about a million
pages). Minutes after 11am, response rose fast to 10-20 seconds
and few people would wait that long, they just hit stop..
(which doesnt provide my server any relief from their request).
By 4pm I'd got the SQL server able to cope with current load,
and everything was fine after that..
This is all moot if you never plan to get anywhere near max
throughput.. nevertheless.. as a business, if incoming load
does rise (hopefully because of press) I'd rather lose 20% of
visitors to a "sluggish" site, than lose 100% of visitors
because the site is all but dead..
I received a helpful recommendation to look into "lingerd" ...
that would seem one approach to solve this issue.. but a
lingerd setup is quite different from popular recommendations.
-Justin
On Thu, Jan 04, 2001 at 11:06:35AM -0500, Geoffrey Young wrote:
>
>
> > -----Original Message-----
> > From: G.W. Haywood [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, January 04, 2001 10:35 AM
> > To: Justin
> > Cc: [EMAIL PROTECTED]
> > Subject: Re: the edge of chaos
> >
> >
> > Hi there,
> >
> > On Thu, 4 Jan 2001, Justin wrote:
> >
> > > So dropping maxclients on the front end means you get clogged
> > > up with slow readers instead, so that isnt an option..
> >
> > Try looking for Randall's posts in the last couple of weeks. He has
> > some nice stuff you might want to have a play with. Sorry, I can't
> > remember the thread but if you look in Geoff's DIGEST you'll find it.
>
> I think you mean this:
> http://forum.swarthmore.edu/epigone/modperl/phoorimpjun
>
> and this thread:
> http://forum.swarthmore.edu/epigone/modperl/zhayflimthu
>
> (which is actually a response to Justin :)
>
> >
> > Thanks again Geoff!
>
> glad to be of service :)
>
> --Geoff
>
> >
> > 73,
> > Ged.
> >
--
Justin Beech http://www.dslreports.com
Phone:212-269-7052 x252 FAX inbox: 212-937-3800
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