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Citrix Server + 'dumb' terminals
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Forum:
Visual FoxPro
Category:
Other
Miscellaneous
Thread ID:
00584458
Message ID:
00586145
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34
PMFJI,

Wish I had seen this earlier, but I was out of the country on a cruise ship the past week. Anyway, DEFINITELY get the memory. I got a call one time, to help a customer who had a different outfit set up their Citrix server. Problme was it was VERY slow. #1: How many users do you have? A: 30 #2: How much RAM is in the server A:256MB. Problem solved.
I did some testing with another client who sold a commercial app written in VFP (I wish I could remember the name so as to add it to the registry), they had version in VFP 3.0, 5.0, and 6.0. 3.0 does NOT work well in a Citrix environment. ALl the 16-bit compatibility stuff, plus the screen redraws, even with a direct LAN connection, were VERY slow. VFP5 was fine, perfectly acceptable even over dialup lines. VFP6 was even faster (this before the BITMAP setting in the last service pack). How many users over how fast of a leased line? You should allow at least 19.2Kbps per user (more if they print) for reasonable performance. It's hard to judge, especially if the user access is erractic, ie, they open a screen (= lots of transfer) and then sit there staring at it for the next 15 minutes (= basic keepalive, essential 0 bandwidth). Wayne is correct, the ICA protocol used by Citrix is EXTREMELY efficient for remotely displaying the scren contents. The downfall is that it is a poor protocol to do file copying or huge data transfers. FOr optimizing a low bandwidth line, a packet shaper can do wonders (keeps the guy printing a 200 page report from killing all the sessions of the other users). Simple prioritization as done in some routers would not help because all Citrix traffic, be it screen updates or a print job, use the same TCP port.

HTH,
Randy

>DOH!
>
>Thanks for pointing out my microcephalic approach. No, really. I'm suddenly much happier than I was. Now to get them to buy some mopre RAM...
>
>Mike
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