Re: P9, Linux and RDP like desktop virtualization

Hi Richard, some of them use tablets or handphones and it's working, I
don't see (and don't want) any other way for them to use the ERP.

But for people using PC (the real users of the ERP) speed and generally
talking performance it's a must. For this type of usage the data exchange
is HIGH, constant and sustained. Extended grids, high populated forms,
tooltips, popovers and a bunch of open pages. That's why we planned to take
the advantage of executing the client part of the application on the same
machine (using a virtual LAN).

As I said before, the performances using the ERP in "local" mode via
Windows Server RDP is very satisfying instead , using it on a Linux
virtualized desktop, is ... problematic, just say embarrassingly slow.
Especially while loading pages.

Another reason is that we have a lot of idle cores on our Power machine.
Besides that there is also the problem that since the browser cannot
access the PC resources we have to communicate with the Pc using websockets
and thus installing something on the client. And this part suits Dockers
basic management.

TIA
--
Marco Facchinetti

Mr S.r.l.

Tel. 035 962885
Cel. 393 9620498

Skype: facchinettimarco


Il giorno lun 6 apr 2020 alle ore 13:44 Richard Schoen <
richard@xxxxxxxxxxxxxxxxx> ha scritto:

Hi Marco,

What kind of device do the end users have ?

If they have a PC or thin client can't they just use the browser from
there instead of trying to use Linux as a terminal server ?

Maybe I missed something about your architecture perhaps.

Regards,
Richard Schoen
Web: http://www.richardschoen.net
Email: richard@xxxxxxxxxxxxxxxxx

------------------------------

message: 2
date: Mon, 6 Apr 2020 11:05:10 +0200
from: Patrik Schindler <poc@xxxxxxxxxx>
subject: Re: P9, Linux and RDP like desktop virtualization

Hello Marco,

Am 06.04.2020 um 09:26 schrieb Marco Facchinetti <
marco.facchinetti@xxxxxxxxx>:

But my question is: why if I use a Windows based RDP server it's working

without problems and if I do (almost) the same in Power Linux we got
performance problems specifically in the browser?

You connect with RDP to a Linux graphical screen, do I understand right?
So, there may be two culprits:

- Microsoft most likely did heavy optimizations on the server side to make
RDP as fast as we know it. I never would expect that connecting with RDP to
a X-Server session would provide the same performance. I was tinkering with
that stuff a few years ago, because using remote X protocol in Windows
is/was always requiring requiring additional software.

- I suspect that Linux Browsers are also heavily optimized for x86 code.
Maybe some critical routines have been carefully crafted in assembler to
provide the pest performance, while POWER is a niche, compared to the
overwhelming usage count of x86. I did not dig into the gigantic blob of
Firefox Code to look, though.

Why we guest users in an RDP session? Because we can decide the browser

and the update level of the browser. We see many ugly things letting people
choose whatever they want to run our ERP.

I don't know any details yet but to me this sounds like a basic
architectural problem in the ERP itself. For years, browsers have become
more and more similar in behaviour, especially after the release of the
HTML5 standard.

Maybe you could set up a similar Linux terminal server on an x86 server or
VM to test performance with this one?

:wq! PoC

PGP-Key: DDD3 4ABF 6413 38DE - https://www.pocnet.net/poc-key.asc



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