Java 1.4 memory model and hyper threading

Discussion in 'Java' started by usenet@kikobu.com, Oct 2, 2006.

  1. Guest

    Hi.

    Are there any documented problems with running a J2EE application on a
    1.4 JVM on a machine with hyper threading enabled? Specifically, can
    the broken memory model cause problems in a such environment?

    Br,

    Morten
    , Oct 2, 2006
    #1
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  2. wrote:
    >
    > Are there any documented problems with running a J2EE application on a
    > 1.4 JVM on a machine with hyper threading enabled? Specifically, can
    > the broken memory model cause problems in a such environment?


    Sun's 1.4 JVMs actually use the 1.5 memory model. So, you should be
    alright from that perspective, unless you use some dodgy open source "Java".

    As for hyper-threading, multi-core chips or multiple processor chip
    machines, you are more likely to find bugs than on single
    hardware-thread platforms. Most threaded code is full of threading bugs.

    Tom Hawtin
    Thomas Hawtin, Oct 2, 2006
    #2
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  3. wrote:
    > Are there any documented problems with running a J2EE application on a
    > 1.4 JVM on a machine with hyper threading enabled? Specifically, can
    > the broken memory model cause problems in a such environment?


    Not that I know of.

    Very early 1.4 JVM's did not perform wll with HT enabled, but
    that should be solved a long time ago.

    If you have a threading bug in your code, then enabling HT may
    cause it to surface, but that is not HT's fault.

    Arne
    =?ISO-8859-1?Q?Arne_Vajh=F8j?=, Oct 3, 2006
    #3
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