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Thread: Calculating Expected Costs

  1. #1
    Join Date
    May 2012
    Posts
    2

    Wink Calculating Expected Costs

    Hi there, I've got Wowza up and running on EC2 and am really happy with it. I'm having a bit of trouble trying to estimate the costs for our webcasts, though. I found this calculator, but cannot get it to display anything other than a cost of zero, no matter what i plug into the fields. http://calculator.s3.amazonaws.com/calc5.html

    I've got the free tier going for this year. Can someone either point me to a page that explains the cost structure (http://aws.amazon.com/pricing/ec2/ confused me, because while I can calculate bandwidth, this page speaks in terms of time and I have no idea what the different sized instances refer to) OR could someone maybe just ballpark the cost for a webcast like this...

    Rate: 696 k
    Time: One hour
    Viewers: 1,000

    (A very rough estimate would even be helpful.)

    Any help would be greatly appreciated.

    Thanks!

    Dave
    Last edited by HiDaveGeorge; 05-24-2012 at 12:58 PM.

  2. #2
    Join Date
    Dec 2007
    Posts
    22,013

    Default

    Dave,

    Try this:

    (kilobits per second * 60 seconds * 60 minutes / 8 [bits to bytes]) = kilobytes per hour per stream * average number of users * hours * .00001 = gigabytes * price per gig = est total cost.

    (696 * 60 * 60 / 8) * 1000 * 1 * .00001 * .12 = $376

    This assumes 1000 clients will consume the whole hour.

    Richard

  3. #3
    Join Date
    May 2012
    Posts
    2

    Default

    Thanks a million, Richard! That's very helpful. Can you tell me, though, why are you dividing by 100,000 to get gigs? Wouldn't it require dividing by a million?

    Thanks again,

    Dave
    Last edited by HiDaveGeorge; 05-25-2012 at 06:17 PM.

  4. #4

    Default

    HiDaveGeorge,

    kilobits * .001 = Megabits * .001 = Gigabits



    Also found this:
    Allow me to quote from Computer Networks, 4th ed., by Andrew S. Tanenbaum, one of, if not the primary textbook on networking, pp 77-78:

    quote:
    It is also worth pointing out that for measuring memory, disk, file, and database sizes, in common industry practice, the units have slightly different meanings. There, kilo means 2^10 (1024) rather that 10^3 (1000) because memories are always a power of two. Thus, a 1-KB memory contains 1024 bytes, not 1000 bytes. Similarly, a 1-MB memory contains 2^20 (1 048 576) bytes, a 1-GB memory contains 2^30 (1 073 741 824) bytes, and a 1-TB database contains 2^40 (1 099 511 627 776) bytes. However, a 1-kbps communication line transmits 1000 bits per second and a 10-Mbps LAN runs at 10 000 000 bits/sec because these speeds are not powers of two. Unfortunately, many people tend to mix up these two systems, especially for disk sizes.

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