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  1. #1
    Join Date
    Feb 2011

    Exclamation Unexpected Delay

    We have been using the LightStreamer Vivace for updating our clients. Recently we have noticed strange delays in peak periods. Using the Monitor Console, this information is acquired: At the peak time we had 1650 online users, 3000 connections, 1700 sessions and 6000 total subscribers.
    Currently we have 2 web pages, the first page contains a stock watch, watch-list and total market details. The second is a market list with 400 instruments. Each instrument is updated using three message types. MaxItemFrequency of the above three messages is 1 second. In the second page, the messages are updated every one second and MaxBandWidth is 250.
    Are these delays normal?

    Server specification:
    OS: windows web server 2008 r2
    System type: 64-bit Operating System
    DL380G7 HP Server
    2*CPU Quad-Core Intel Xeon Processors X5670
    (2.80GHz,8MB L3 Cache,95W)
    32GB PC3-10600 RAM
    6*146GB/15K DP SAS 6G HDD
    Smart Array P410i/512MB+BBWC Controller
    2*750W Hot Plug Power Supply

  2. #2
    Join Date
    Jul 2006
    Milan, Italy
    As discussed via email, in your scenario a single page seems to cause 400 * 3 = 1200 subscriptions and the bandwidth is 250 / 8 = about 31 kilobytes per second.
    In this scenario the bandwidth limit may be hit in peak time.
    This would cause intense filtering for the most active items and might cause delays for the less active ones.

    In any case, we should analyze the whole history of the internal monitor in order to understand the Server state. Please activate the internal monitor logging, by configuring <text_monitor> to Y and by providing a suitable appender for the LightstreamerMonitorText log4j logger.

  3. #3
    Join Date
    Feb 2011
    Thank you for your reply. We have enabled logging and also made some minor changes. I'll be updating you with more details via email in case the problem stands still.



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