1 Reply Latest reply on Oct 5, 2007 7:17 AM by Daryl Dean

    Application Slowdown: Memory Issue?

    CDGD Level 1
      We have built a Flex 2 App which uses Flash Communication Server. The Flex Client is quite large - it compiles at about 0.5MB. Everything is beautiful, but a couple of users have noticed that their client runs incredibly slowly. I saw this happen today with a user who had been doing fine, then suddenly froze up, connecting to the FMS at an apparent 8Kbps over Broadband. The problem was that the app was taking forever to return the pings to the server.

      Closing his browser and reopening brought no change. Restarting his machine, however, fixed everything and he was running at 700Kbps again.

      We use a lot of NetStreams, and have noticed that the FCS seems to hold open idle streams associated with a particular client when no video is running on them any longer. When you close the client browser, FCS then releases the streams. We have found no way of being able to release the streams at will.

      We wrote this application incredibly tightly, using weak references for all event handlers, nulling all references by using a Dispose() function and making sure that each class Disposed its own children before releasing references. On my PC, with 4GB running Vista in the IDE, the app starts at 10MB then rises to about 20 before falling back again. Seems to be OK - but is it possible that users with smaller amounts of available memory could run into some sort of memory ceiling that could be causing these symptoms?
        • 1. Re: Application Slowdown: Memory Issue?
          Daryl Dean
          There could be an awful lot going on here, so I'll try to hit the big stuff first.

          I assume only a few of your users have had this happen to them, and that most people never see it.

          The first thing I would do is aim the problem browser(s) at this page and see what version of the Flash Player they have:
          If they don't have 9,0,47,0 and there's no really solid reason not to upgrade, then upgrade them and then wait and see if it reproduces.

          There's also a lot of networking stuff that could be doing this. FMS sends a lot of data,and it could be that the network driver is flaky and - after sending and receiving so much data - just dies. If you have many users who have no trouble and a couple or a few that do, look for what's different.