Re: [amibroker] Re: Amibroker speed

["Tomasz Janeczko" <amibroker@xxxxxx>]

Hello,

Right now, unless you run multiple instances it won't use multi-CPU/cores however

this will change when multi-threaded optimizer will arrive later this year.

Best regards,
Tomasz Janeczko
amibroker.com

----- Original Message -----

From: joelamibroker

To: amibroker@xxxxxxxxxxxxxxx

Sent: Friday, April 28, 2006 3:52 PM

Subject: [amibroker] Re: Amibroker speed

Hi,

just a follow up question to this post:

Will Amibroker be able to take of a multiple CPU system (e.g. 4xAMD
Opteron 285 Dual Core CPUs)

Or will amibroker be able to take advantage of the dual core on a
SINGLE CPU only eg. AMD FX60 or Pentium 955XE?

I want to do lots of optimisations ..

Thanks,

Joel



--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxx> wrote:
>
> Hello,
>
> 64-bit version of AmiBroker is ready in internal beta version.
> Speed benefit compared to 32 bit version is minor, just about 10%.
>
> Dual core/hyperthreading will give benefits for optimizations only
> once multiple treading optimizer is ready.
> I have done some experiments in parallelizing other areas
> including array operations but it turned out that single threaded
> array operations are faster. Strange? Yes stange but true.
> As it turns out parallelized code needs more time for thread
> setup / synchronization than it is needed to actually compute
> array addition for a couple thousands of bar for example
> in a tight assembly loop (especially after recent optimizations).
> Actual timings for:
> million iterations of array addition
> for( i = 0; i < 1000; i++ )
>  for( k = 0; k < 1000; k++ )
>    Sumh = H + L;
> were:
> old single threaded code: 24 seconds
> new single treaded code (beta 4.75) (optimized on assembly level): 5
seconds
> two threads on dual core cpu optimized assembly: 21 seconds
> (all measurements Athlon64x2 3800 (2GHz clock))
> 
> Real-world tests show that parallelization makes sense only
> if code part that is intended to run in parallel needs more than few
milliseconds.
> Optimization is best area because single optimization step is long
enough
> so thread setup/synchronization time is not dominant.
>
> BTW: recent
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "slwiser" <slwiser@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Saturday, January 21, 2006 3:49 PM
> Subject: [amibroker] Amibroker speed
>
>
> >
> > Dual core use is coming for all of us sooner than we would like. How
> > much benefit is the dual core and hyperthreading if any while using
> > Amibroker?
> >
> > 64 bit operating system is just around the corner, any benefit here?
> >
> >
> >
> > Please note that this group is for discussion between users only.
> >
> > To get support from AmiBroker please send an e-mail directly to
> > SUPPORT {at} amibroker.com
> >
> > For other support material please check also:
> > http://www.amibroker.com/support.html
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>







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