 | | | Re: Flashcom Performance | Re: Flashcom Performance 2004-02-17 - By Paul Bernhardt
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On 2/13/2004 12:06a, "Wyeth Ridgway" <Wyeth@(protected)> wrote:
> Im trying to gauge some basic numbers for how many people flashcom can
> support, and when loadbalancing solutions need to be used. I sent an email
> to macromedia and someone just called back and gave me the following
> details:
>
> This system: Pentium 4, 2+ Ghz, 2000 NT, min of 512 M of ram
>
> Should support 10,000 simultaneous users. I had her repeat it because I
> couldn't believe thats what she said.
>
> Clearly this is total nonsense right? Can someone give me a real world
> figure for that machine spec?
>
> Thanks,
>
> Wyeth
Hi Wyeth,
First of all, our license has two peak limits relevant to your question:
2500 simultaneous users and 10 mbps of bandwidth. So what does your license
allow?
Second, 10 mbps spread among 10,000 simultaneous users would allow about
1 kbps per person. Not much.
Here's some more devil-in-the-details stuff. Simultaneous users doing
what? Our similarly configured single-processor development box, on a T1
connection, with one 10 mbps FCS license can support around 40 people with
one stream of audio only (c. 20 kbps each) or around 24 people with two
streams of video and one stream of audio (180-260 kbps each). Now, those are
clear blue day figures, not so much for the network as for the processor and
what it does and doesn't have to negotiate, since it's just one audio signal
emitting constantly from one source, rather than a real-world group
discussion, where audio comes from everyone, at some point during the
session, and occasionally two people open their mic to talk at once.
In other words, on our little development box, we're redlining the
processor before we reach our server bandwidth limit (and long before we
reach our server users limit).
Brook, you'd asked about streaming video under either one or two copies
of FCS personal edition (1 or 2 mbps bandwidth limit; 50 or 100 user limit).
We're seeing a video stream cost between 80-120 kbps so, if our numbers for
video are like yours, you'd be able to host either 8 or 16 people
simultaneously (taking the upper limit figure of 120 kbps per stream for
safety).
As for text, text costs 8 bits (b) = 1 byte (B) per character. Your
addition to text chat is 100 characters long, that's 800 b = 100 B, or about
0.8 kb or 0.1 KB.
Hope this is useful.
yours
paul bernhardt
university of minnesota
http://epilinux.epi.umn.edu/fcs/class/demo.html
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