Re: new to programming in Linux

From: Pasi Parviainen (parviainen.pasi_at_kolumbus.fi)
Date: 06/18/04

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    Date: Fri, 18 Jun 2004 18:46:37 +0300

    Roger Leigh wrote:
    > On 2004-06-18, Pasi Parviainen <pasi.parviainen@mirasys.fi> wrote:
    >
    >>
    >>Roger Leigh wrote:
    >>
    >>
    >>>On 2004-06-16, Tim <not@likely.com> wrote:
    >>>
    >>>
    >>>>Java seems attractive, probably because I´ve heard of it. Is it possible to
    >>>>write good, fast programs in Java?
    >>>
    >>>"Fast" and Java don't generally go together. I've only dabbled a
    >>>little, but even the simplest interfaces (dialog with a close button)
    >>>were slow.
    >
    >
    >>People should really look the numbers and forget old mantra "Java is slow."
    >
    >
    > If my own experience shows it to perform like a dog, why should other
    > peoples measurements make it better? That won't make it work for me,
    > will it?
    Of course not!

    >
    > The test program was three dialogs: two which were simple entries to
    > enter numbers, and one to display a result (the two numbers multiplied
    > together). So each dialog was either a label or entry, plus an OK
    > button. Each dialog took 2-3 second to display. That's unacceptable:
    > if this was GTK+, it would be nearly instantaneous.
    >
    > If it's that bad for a trivial dialog, I can't bear to think about how
    > bad a real application will be. (Those I have seen did not perform
    > well.)
    >
    >
    >>Take pointers (for example) from here:
    >>http://www.idiom.com/~zilla/Computer/javaCbenchmark.html
    >
    >
    > Benchmarks are useless. Sure, under some workloads, it's OK. But the
    > performance of Swing was laughable.
    Didn't look what that article said?

    >
    > Some of those benchmarks show Java can be OK. But that wasn't my point.
    > My point was that Swing was so slow as to be barely usable. I tested
    > on both Windows and Linux.
    >
    >
    >>>The SunONE IDE was completely unusable on my PIII 900MHz
    >>>laptop.
    >>
    >>Memory, eh? The most significant thing for Java slowness is short of
    >>system memory.
    >
    >
    > 256 MiB core and 512 MiB swap should be enough for one program! This
    > was on a Windows machine, BTW. That is more than average, and if it
    > can't run in that much, that's not acceptable.
    Yeah. Memory costs and such...
    Well, I'm running IntelliJ IDEA (100% pure Java) with my 1.2GHz machine
    with 512MB memory, well above accepted bar. I'm happy.

    At the same time when I compare my KDE applications, I don't see
    difference on performance. Maybe my KDE and X is so slow...?... ;-)

    Oh, and the same time my windows box has 1GB memory and 2.8GHz
    processor, and it is usable. But that is different story. 

    --
Pasi Parviainen, Chairperson
Open Source Finland - OSF ry
www.opensourcefinland.org/en
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