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Thanks Tomasz for your responsiveness in fullfilling our requests to have 1 sec or below tick data together with floating point volume. This exceeds my own expectation.
Could you share with us the performance of 64 bits PackDate structure vs the current 32 bits? I presumed that 44 bytes per bar vs the current 40 bytes per bar, would only mean a 10% extra memory/L2 cache requirements, and shouldnt affect peformance too much with the exception that if a backtest is currently just under the cache boundary would soon be over with 5.27.
/Paul.
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>
> Hello,
>
> Existing 3rd party DLLs CONTINUE to work OK, thanks to backward compatibility layer added in 5.27, but
> a) compatibility layer induces some extra CPU overhead (less than 0.001 sec per 1000 bars retrieved from data plugin)
> b) of course new features (extended resolution and floating point volume) are not available using old plugins
>
> Also, the change only affects DATA plugins. Any other plugins (AFL, optimizer) do not require any change.
>
> Yes, new ADK will be released soon (this week)
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "Paul Ho" <paul.tsho@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Monday, August 03, 2009 11:28 AM
> Subject: [amibroker] Re: AmiBroker 5.27.0 ALPHA released
>
>
> >I presume that existing third party dll wont work any more, Is that correct?
> > Would you be releasing a new ADK as part of the next release?
> > /Paul.
> > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@> wrote:
> >>
> >> Hello,
> >>
> >> AmiBroker 5.27.0 ALPHA released
> >>
> >> http://www.amibroker.com/devlog/2009/08/03/amibroker-5-27-0-alpha-released/
> >>
> >> ALPHA means that this version is experimental and you *must* do backup of your data files before installing it. New version
> >> changes
> >> the format of database files (quotation / stock / drawings ),
> >> so once data are saved with version 5.27 you will NOT be able to read them in pre-5.27 version.
> >> The ALPHA installer comes with simple backup program that will create a copy of your AmiBroker directory - it will display right
> >> after new program files are copied. The backup will be created in C:\AmiBrokerBackup folder. Please note that this backup is
> >> intended to copy the database files, not program files which will be overwritten anyway. If you want to backup program files too,
> >> you need to backup them manually prior to installation. If you made your own backup prior to installation, you can skip (Cancel)
> >> the
> >> backup part of the install routine.
> >>
> >> CHANGES IN VERSION 5.27.0 (as compared to 5.26.0):
> >>
> >> - changed core data structures to support the following
> >> -- 64 bit date/time field with date range of 4095 years and resolution down to microseconds
> >> -- floating point volume and open interest fields
> >> -- two new auxilliary data fields per bar (internally, not yet exposed)
> >> -- 100 new user-defined fundamental data fields (internally, not yet exposed)
> >> -- support for GICS (internally, not yet exposed)
> >> -- upto 48 character length in Symbol/Alias/WebID fields
> >> - Updated plugins for eSignal, IQFeed, Interactive Brokers, Quotes Plus, Metastock to support floating point volume/open int and
> >> 64
> >> bit date/time
> >> - 1-second interval bars
> >> - Metastock plugin now reads long symbol description
> >> - Symbol lock fixed (does not interfere with Interval linking)
> >> - Added simple "BackupAB.exe" to backup entire AmiBroker folder after installation to prevent data in old format.
> >>
> >> Details in the read me:
> >> http://www.amibroker.com/devlog/wp-content/uploads/2009/08/readme5270.html
> >>
> >> Best regards,
> >> Tomasz Janeczko
> >> amibroker.com
> >>
> >
> >
> >
> >
> > ------------------------------------
> >
> > **** IMPORTANT PLEASE READ ****
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> >
> > TO GET TECHNICAL SUPPORT send an e-mail directly to
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> >
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> >
> >
>
------------------------------------
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