On Wed, 6 Oct 2010, Nathan Andelin wrote:
The Wikipedia definition works for me. "scalability is a desirable
property of a system, a network, or a process, which indicates its
ability to either handle growing amounts of work in a graceful manner or
to be enlarged."
Under that definition CGIDEV2 would scale well just by running under IBM
i where available resources (processors, memory, etc.) are automatically
allocated to separate jobs. No need to configure anything, except
standard HTTP server configuration directives allowing a given number of
threads and CGI server jobs, timeouts, and so forth. Native workloads
automatically scale to use available resources.
There is nothing unique or special about the CGDEV2 environment described
above on the IBM i vs. CGI programming on *nix. In both cases available
resources and automatically allocated to separate jobs. It seems to me
that a possible differentiator in performance is how well the operating
system performs a context switch (changes the active process on a CPU).
I believe that I have read that CGI programming doesn't scale particularly
well. If that is the case, I believe that one would find no particular
advantage to doing CGI programming on the i versus anything else as I
believe the i isn't doing anything particularly different than what other
systems do. Then if CGI programming in general doesn't scale well, I
would suppose that CGI programming on the i doesn't scale well, either.
Conversely, if CGI programming scales perfectly well on other systems I
would expect the same on the i.
James Rich
if you want to understand why that is, there are many good books on
the design of operating systems. please pass them along to redmond
when you're done reading them :)
- Paul Davis on ardour-dev
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