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i have a 3 gig memory in my machine and installed ab when i had 2 gig
of memory on it. it set the cache to 209. i just changed it to 1 gig
33% of my memory.
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx>
wrote:
>
> By default is it set to half of available physical memory.
> 409MB should be just fine in your case.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "danielwardadams" <danielwardadams@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Thursday, May 15, 2008 3:26 PM
> Subject: [amibroker] Re: Dual-core vs. quad-core
>
>
> > Tomasz,
> > I'm sure you've answered this before but I couldn't find it. How
do
> > you best determine AB internal cache size? I see mine is set at
> > 409MB. Other database settings are 10000 symbols (even though I
never
> > have over 200-300 in my database), number of bars to load is
1000,
> > limiting number of saved quotations isn't checked.
> >
> > I'm running an Athlon 3200+ processor, Windows XP SP2, and AB
5.09.0.
> > I have 2GB and rarely use much over half of it. I'm mostly
interested
> > in speed while optimizing formula parameters with Quotes Plus EOD
> > data using the Intelligent Optimizer (IO). I have one long run on
the
> > weekends that I'd be (very) interested in speeding up
> >
> > Thanks,
> > Dan
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@>
> > wrote:
> >>
> >> Hello,
> >>
> >> As for 1) you would do better by increasing AB internal cache in
> > preferences.
> >>
> >> Best regards,
> >> Tomasz Janeczko
> >> amibroker.com
> >> ----- Original Message -----
> >> From: "akerstkh" <khtangkh@>
> >> To: <amibroker@xxxxxxxxxxxxxxx>
> >> Sent: Wednesday, May 14, 2008 6:09 PM
> >> Subject: [amibroker] Re: Dual-core vs. quad-core
> >>
> >>
> >> > Good morning,
> >> >
> >> > Just to share some experience in Optimizing the Speed...
Mainly
> > in
> >> > compiling of data with the ATC instruction with loops...
> >> >
> >> > 1) Created a RAM Disk of 1G. Copy the Data Folder to the RAM
> > Disk
> >> > and then use the Data in the RAM Disk do the compiling. (Only
> > worth
> >> > doing if compile a couple of times a day.. It cut down from 16
> > mins
> >> > to 11 mins. )
> >> >
> >> > 2) MOVE the Data Folder to another physical drive. Then
perform
> > the
> >> > disk defragmenter on the Amibroker Drive a couple of times.
Then
> >> > MOVE the Data Folder back to the original position.
> >> >
> >> > 3) Chop Down the number of bars in Data Base.
> >> >
> >> >
> >> >
> >> >
> >> > The Current system is Intel Core 2 @2.13GHz with 4G RAM.
> >> >
> >> > Yet to try is to upgrade the system with RAID4 with 4 Disks
and
> >> > Q9450.
> >> >
> >> > Is there any one can comment on the experience with RAID5
> > system?
> >> >
> >> >
> >> > Best Regards
> >> > KH Tang
> >> >
> >> >
> >> > --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@> wrote:
> >> >>
> >> >> It also makes me wonder if there is another possibility for
> > speed
> >> >> optimization. I run more than 1 RT chart at the same time to
> > get
> >> >> multi-timeframe results that are not possible in a single
chart -
> > -
> >> > then
> >> >> pass results between the charts. It seems as though
parallel
> >> >> processing would be possible between multiple "live"
indicator
> >> > mode
> >> >> charts. Maybe I will have to get the 8 core system next
time :)
> >> >>
> >> >> Best regards,
> >> >> Dennis
> >> >>
> >> >> On May 14, 2008, at 10:13 AM, dloyer123 wrote:
> >> >>
> >> >> > Interesting result. It is reasonable to expect newer and
> > future
> >> >> > processors to have even larger caches. 6MB on the E8400
> >> >> >
> >> >> > So, there may be an opportunity to get useful work out of
the
> >> > other
> >> >> > cores during long optimization runs. Maybe large "work
units"
> >> > such
> >> >> > as symbols lists or entire optimization passes to minimize
sync
> >> >> > overhead?
> >> >> >
> >> >> > That also implies that user formula code could be optimized
if
> > we
> >> >> > group array access together, ie use a result right after it
is
> >> >> > created, so it can be pulled out of cache, rather than wait
> > until
> >> >> > later in the code. I will have to try this...
> >> >> >
> >> >> >
> >> >> >
> >> >> > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko"
<groups@>
> >> >> > wrote:
> >> >> >>
> >> >> >> Hello,
> >> >> >>
> >> >> >> I just run the same code on my relatively new notebook
(Core
> > 2
> >> > Duo
> >> >> > 2GHz (T7250))
> >> >> >> and the loop takes less than 2ns per iteration (3x
speedup).
> > So
> >> > it
> >> >> > looks like the data sits entirely inside the cache.
> >> >> >> This core 2 has 2MB of cache and thats 4 times more than
on
> >> > Athlon
> >> >> > x2 I got.
> >> >> >>
> >> >> >>> If what you say is true, and one core alone fills the
memory
> >> >> >>> bandwidth, then there should be a net loss of performance
> > while
> >> >> >>> running two copies of ami.
> >> >> >>
> >> >> >> It depends on complexity of the formula and the amount of
> > data
> >> > per
> >> >> > symbol
> >> >> >> you are using. As each array element has 4 bytes, to fill
4
> > MB of
> >> >> > cache
> >> >> >> you would need 1 million array elements or 100 arrays each
> > having
> >> >> > 10000 elements
> >> >> >> or 10 arrays each having 100K elements. Generally speaking
> > people
> >> >> > testing
> >> >> >> on EOD data where 10 years is just 2600 bars should see
speed
> > up.
> >> >> >> People using very very long intraday data sets may see
> >> > degradation,
> >> >> > but
> >> >> >> rather unnoticeable.
> >> >> >>
> >> >> >> Best regards,
> >> >> >> Tomasz Janeczko
> >> >> >> amibroker.com
> >> >> >
> >> >> >
> >> >> > ------------------------------------
> >> >> >
> >> >> > 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 NEW RELEASE ANNOUNCEMENTS and other news always check
> > DEVLOG:
> >> >> > http://www.amibroker.com/devlog/
> >> >> >
> >> >> > For other support material please check also:
> >> >> > http://www.amibroker.com/support.html
> >> >> > Yahoo! Groups Links
> >> >> >
> >> >> >
> >> >> >
> >> >>
> >> >
> >> >
> >> >
> >> > ------------------------------------
> >> >
> >> > 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 NEW RELEASE ANNOUNCEMENTS and other news always check
DEVLOG:
> >> > http://www.amibroker.com/devlog/
> >> >
> >> > For other support material please check also:
> >> > http://www.amibroker.com/support.html
> >> > Yahoo! Groups Links
> >> >
> >> >
> >> >
> >>
> >
> >
> >
> > ------------------------------------
> >
> > 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 NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> > http://www.amibroker.com/devlog/
> >
> > For other support material please check also:
> > http://www.amibroker.com/support.html
> > Yahoo! Groups Links
> >
> >
> >
>
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