On 09.02.2016 08:41 AM, Jordan Poppenk wrote: > 1) Does X2Go do its desktop rendering on the server's GPU? That is, in > building a server to support X2Go sessions, should I buy a fancy graphics > card when trying run many sessions; or alternatively multiple core CPU's? If > GPU matters, does it matter whether the card is of the GeForce vs. Quadro > variety?
Currently no, not at all. > 2) Does reducing colour depth have any substantive effect on the > CPU/GPU/bandwitdth burden on the server? My users don't really need more than > thousands of colours. I know this and JPEG quality can be adjusted > client-side, but when I played with these settings, it didn't seem to impact > server-side bandwidth (which continued to hover around 1Mbit per client even > with just a few colours). Should I be adjusting this in the LXDE startup > settings instead? In theory, yes. A lower color depth normally translates to smaller images in size, but of course the general compression ratio achieved by the algorithm - which is also based on properties of the raw image data - might make this point moot (especially if the image doesn't actually contain a big variety of colors.) So that question is actually quite difficult to answer definitely, "it depends." > 3) Is it fair to estimate that I need about 1Gb of RAM per client (just to > load the desktop) just to load LXDE as the desktop? 1 GB sounds high for LXDE, but I have never measured this. Maybe others did. Still, the problem here, too, is that the answer is: "it depends." For instance, consider Java-based applications: these use separate VMs for each invokations and do not share any internal state, so the individual footprint is high. Compare that to, for instance, KDE(4), which as far as I know does a decent job of sharing libraries - hence only the first started session will have a huge impact, with subsequent sessions adding less to the global memory footprint (not "nothing", of course, because only libraries are shared, no actual program data.) Mihai
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