Tim,
Bravo! Well said!
Susan Lynch
F.W. Davison & Company, Inc.
----- Original Message -----
From: "Timothy Snyder" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, August 29, 2007 10:43 AM
Subject: Re: [U2] Clearing a portion of a screen
So today, how do you measure expensive? And with todays flamethrowers,
does
it really matter?
In my mind, performance always matters, especially if there are dozens or
hundreds of processes running the logic in question. This has a bearing
not only in CPU consumption but also network bandwidth. Always think
about the slowest component in the stream, which in this case would be the
network. If you make a single request (i.e.: the example provided earlier
that put all the @ logic in a single string to be displayed in one CRT
statement), that gets tucked into one network packet and is dealt with all
down the line as a single entity. If you make a separate request for each
field, you're initiating a separate network request and generate separate
packets for each of those fields. This could result in many kilobytes of
information, in multiple packets, going across the network, interlaced
with the individual requests from other users, to update just a few bytes
on the screen.
But even if you're working on a local PC, you can see the difference
between doing things in one CRT versus multiple. It's a much smoother
look, which is more appealing to the end user, since the cursor isn't
dancing all around the screen.
As to flamethrowers, faster hardware often means that little
inefficiencies can add up to huge bottlenecks when given the chance. Water
always seeks its own level, and computers will always find a way to
exploit the slowest component. If you have more or faster CPUs cranking
out information for the network to handle, everything on the network will
suffer. It's conceivable that could include things totally unrelated to
the U2 application or even the server in question, conceivably having
enterprise-wide implications.
OK - sorry for the rant. That always seems to happen when I talk about
performance. Let's try again.
And with todays flamethrowers, does it really matter?
YES!
Tim Snyder
Consulting I/T Specialist
U2 Lab Services
Information Management, IBM Software Group
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