Re: Architecture ideas for batch processing?


"Aquila Deus" <aquila.deus@xxxxxxxxx> wrote in message
news:1118552658.847515.283050@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Alan Meyer wrote:
> > "Ray in HK" <ray@xxxxxxxxx> wrote in message
news:d8ge0v$20e4@xxxxxxxxxxxxxxxxxxxxxxxxx
> > > What are the market price of ram.
> >
> > Thanks for the reply.
> >
> > RAM can be surprisingly expensive when you buy it in multi-bank,
> > multi-gigabyte modules for Sun machines. But your point is well
> > taken. The extra cost may be justified.
> >
> > There may be some processing efficiencies besides using
> > less memory management in a multi-threaded vs. multi-tasking
> > design.
> >
> > Maybe someone has experience in this area?
>
> Ask unix or windows experts. There are at least three disadvantages:
>
> 1.Allocating a process uses more resource than a new thread. But given
> Java's own resource need, .... :-)
>
> 2.Context-switching processes takes longer time than switching threads.

So on a per batch basis, the percentage of time wasted is this:

(A tiny part of a fraction of a second) / (A few minutes or hours)
is approx == 0, so just forget about it.

> 3.On non-SMP, sync between processes are super heavy compared to
> thread's. In x86 all you need to do mutex between threads is an
> exchange command, but between processes....
>
>
> PS: none of above is really important.
>


.

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