That's difficult, there are very few true multithreaded programs that I know
of. The ones I use that seem to do it very well are things like SQL
Perhaps you could try some benchmarking software and run two instances at
once?
Peter Lawton
"Hydrology" <> wrote in message
news:2D69BD4C-8EDE-468E-8433-...
> It could be that these programs that were compiled as multithreaded
> applications are not structured very well for multitasking. That would
> explain why even though both processors are bouncing around between 20 and
> 80
> percent, the total never gets over 50%.
>
> Do you know of a true mutithreaded application that I could download and
> test on this machine?
>
>
>
> "Peter Lawton" wrote:
>
>> If the task running is only single threaded, or does most of it's work on
>> a
>> single thread it will only be able to use 100% of 1 processor, sometimes
>> the
>> OS swaps this between the multiple processors, but it will never use more
>> than the equivalent of 100% on a single processor, for example 50% on
>> each
>> of 2 CPUs or 25% on each of 4 CPUs.
>>
>> Programs that are written to be multi threaded, like SQL server,
>> certainly
>> can use all of your processors fully, unfortunately there aren't very
>> many
>> programs written to take advantage of multiple processors or drivers,
>> DLLs
>> etc either I'd guess.
>>
>> Other things that will use all processors are apps like Symantec AV for
>> Exchange which runs multiple instances of the scanning engine, each one
>> can
>> potentially use 100% of a single CPU.
>>
>> I think you'd either have to write/compile the program to be able to use
>> more than one thread effectively or perhaps run more than one instance at
>> once. I'm not an expert though, I'm sure someone will be able to tell you
>> more.
>>
>> Peter Lawton
>>
>> "Hydrology" <> wrote in message
>> news:662BD5DB-8FF7-42C0-99CD-...
>> >I have a dual processor AMD Opteron, 4 gig of memory and a 2-200Gig SATA
>> >Raid
>> > 0 hard drive setup. I have noticed that the operating system will not
>> > allow
>> > any one program to have more than 50% of the processor time. I have
>> > several
>> > large computer models and when they are running, they use both
>> > processors
>> > with veach thread getting ariable usage percentage, but the total as
>> > reported
>> > by Task Manager/Performance is always pegged at 50%. Not 49% and not
>> > 51%.
>> >
>> > When I am running multiple programs I can get the total processor usage
>> > to
>> > go over 50%, but for any one program that can get there, something is
>> > stopping it from getting more than 50% of the available processor time.
>> > I
>> > have noticed this with several high end computer model as well as some
>> > code
>> > that I developed myself. I am running Windows XP 32, would Windows XP
>> > 64
>> > eliminate this limitation?
>> >
>> > To reduce runtime I would like to be able to allocate 100% of both
>> > processors if the program needs it.
>>
>>
>>
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