I need more horsepower. Yes I'd agree with that !
However... which web solution would you prefer:
A. (ideal)
load equals horsepower:
all requests serviced in <=250ms
load slightly more than horsepower:
linear falloff in response time, as a function of % overload
..or..
B. (modperl+front end)
load equals horsepower:
all requests serviced in <=250ms
sustained load *slightly* more than horsepower
site too slow to be usable by anyone, few seeing pages
Don't all benchmarks (of disk, webservers, and so on),
always continue increasing load well past optimal levels,
to check there are no nasty surprises out there.. ?
regards
-justin
On Thu, Jan 04, 2001 at 11:10:25AM -0500, Vivek Khera wrote:
> >>>>> "J" == Justin <[EMAIL PROTECTED]> writes:
>
> J> When things get slow on the back end, the front end can fill with
> J> 120 *requests* .. all queued for the 20 available modperl slots..
> J> hence long queues for service, results in nobody getting anything,
>
> You simply don't have enough horsepower to serve your load, then.
>
> Your options are: get more RAM, get faster CPU, make your application
> smaller by sharing more code (pretty much whatever else is in the
> tuning docs), or split your load across multiple machines.
>
> If your front ends are doing nothing but buffering the pages for the
> mod_perl backends, then you probably need to lower the ratio of
> frontends to back ends from your 6 to 1 to something like 3 to 1.
>
> --
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> Vivek Khera, Ph.D. Khera Communications, Inc.
> Internet: [EMAIL PROTECTED] Rockville, MD +1-240-453-8497
> AIM: vivekkhera Y!: vivek_khera http://www.khera.org/~vivek/
--
Justin Beech http://www.dslreports.com
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