The VNC Manager - SmartCode Solutions Forum / SmartCode VNC Manager / Bug Reports / high cpu load / Latest Posts

RE: high cpu load

Support (s-code) — Mon, 26 Jun 2006 21:28:47 GMT

Jörg,
most probably the 3D-game application is the cause of the problem.
VNC protocol doesn't allow to specify dimensions of the client window, like RDP protocol allows, so in case of the VNC the full server screen bitmap gets
transferred. Which in case of the 3D-game should be fairly large. And the VNC Manager should resize the image to the smaller size, which is CPU intensive operation.

What might help is to try to reduce quality of the transferred image. Try to open Tools->Options->Thumbnails.
Click use Default connection settings checkbox. Click Edit Settings button.
Enable JPEG compressing and try to play with the JPEG compression value. If you have fast connection to the VNC server then Tight encoding might be not the best choice.
Try to set encoding to Hextile or ZlibHex.

RE: high cpu load

jhoppe — Sat, 24 Jun 2006 03:38:32 GMT

Hi,

I performed a few tests:

- in real time mode with one thumbnail, cpu load is ca. 50%.
- when updating the thumbnail, there is also a big burst in cpu load
Due to this, the display of 3 thumbnails every 3 seconds causes
a permanent load of 100%.
- cpu load depends on server activity:
load occurs only if a real time 3D-game application runs ...
and depends then highly on the game situation, of course.
There is no load if only static desktop is displayed.
- target machine resolution is 1024*768
- vnc server is "UltraVNC 1.0.1 Release"

Of course transferring nearly full screen 3d images is a heavy task.
The original UltraVNC viewer also uses lot of cpu when displaying this.
So I think its not an error in VNC manager.

Have you any tips for optimal settings for low cpu load for the viewer client?
Disabling compressions does not help much.
Normally, I use "Tight" encoding.

greetings,

j. hoppe

RE: high cpu load

Support (s-code) — Wed, 21 Jun 2006 21:43:50 GMT

Joerg,
it sounds like something really wrong. Normally even when a user adds 10+ thumbnails, and especially if they set to update via a time interval, the CPU load is very low.

Could you please send us email to support@s-code.com with the content of the following directory:
%USERPROFILE%\Application Data\Smart Code\VNC\Manager\

And also with answers to the following questions:
-The computers you are monitoring are there a lot of on screen activity goes on on these?
- What's the screen resolution of remote PCs?
- What build number of UltraVNC server they have installed?
- if you add only a single thumbnail view item and set update mode to Realtime, what would be the CPU load?

[quote]May be I have a problem with .net 2.0?[/quote]
Nope, all versions prior to v3.5 are .Net 1.1 based.

high cpu load

jhoppe — Wed, 21 Jun 2006 16:48:51 GMT

I just bought vnc manager 3.0 std.
I observed that vnc manager uses lot of cpu, if its just displaying thumbnails.

I'm displaying thumpnails of only 3 UltraVNC servers and update them every 3 seconds, so
there's not so much work to do. But my system slows down to the point that web applications in a
parallel running vmware machine terminate because of connection timeout.

Using the VNC managers build-in VNC viewer consumes also much more cpu power than
the original UltraVNC Viewer does.

May be I have a problem with .net 2.0?
Are there any tips how to improve performance?

My settings are: Win2000 SP4, watching 3 UltraVNC servers, Tight compression,
unloaded 100 mbit LAN.

Thanks for caring,

Joerg Hoppe