| Title: | DECWINDOWS 26-JAN-89 to 29-NOV-90 |
| Notice: | See 1639.0 for VMS V5.3 kit; 2043.0 for 5.4 IFT kit |
| Moderator: | STAR::VATNE |
| Created: | Mon Oct 30 1989 |
| Last Modified: | Mon Dec 31 1990 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3726 |
| Total number of notes: | 19516 |
I need some information regarding distributed decwindows applications
and memory requirements. I am trying to defuse a situation in which
I believe a customer was given bad information. Please excuse if
the information is given elsewhere in this conference. I've looked
briefly, but didn't find what I needed. Here goes.
The customer is looking at a server and about 100 clients. The client
mix will be about 67 VT1200s and 33 VS3100s. What I need is an idea
of how much memory is required at the server for each DECwindows
window independent of the application. For example, the 67 VT1200s
will be running 3270 software on the server and displaying the output
on the VT. The user may have three such windows open. The question
is how much memory is required at the server for each window opened
forgetting about the 3270 application itself. I need the same info
for a lat VT220 connect. How much memory is required for the connect
itself, independent of the application being run.
Here is the way the customer thinks. He is looking at a VAX4000
for a server. He called Gartner group and they told him the average
user requires 2MB of memory for each VT1200 independent of the application
being run. Customer says 100 active users x 2MB = 200MB independent
of the applications. Since a VAX 4000 has 128MB memory max, he
concludes that two VAX 4000s may not be enough.
I know this is ridiculous, but when he asked me how much memory
is required, I had to punt.
Can anyone help ?
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 3338.1 | Some guidelines | OSLACT::OLAV | Do it in parallel! | Wed Sep 19 1990 07:51 | 32 |
> The question is how much memory is required at the server for each window > opened forgetting about the 3270 application itself. I assume that by server you mean the machine where the application will be running (VAX 4000) and not the X server. By window I assume you mean a 3270 window. The amount of memory used is 100% controlled by the application. Without an application, no windows. One application can control many windows. In other word the amount of memory used for 3270 windows is the amount of memory required by the 3270 application itself. > I need the same info for a lat VT220 connect Exactly the same amount of memory as a normal login from a terminal (for each window). Running DECterm on the VAX 4000 displaying on the VT1200 will require more memory, but since the VT1200 has a terminal emulator locally which connects via LAT this will not be neccessary. > He called Gartner group and they told him the average user requires 2MB of > memory for each VT1200 independent of the application being run. This statement is quite meaningless. Memory consumption is totally dependent on the applications being run. A DECterm window is using much less memory than a DECwrite window. However 2MB memory for an average user seems reasonable. > Customer says 100 active users x 2MB = 200MB independent of the applications. > Since a VAX 4000 has 128MB memory max, he concludes that two VAX 4000s may > not be enough. Why are you counting the 33 VS3100? Why not run the 3270 locally in the workstation? Only the VT1200 needs another machine to run the applications on. Olav | |||||