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Hello,
Disk fragmentation or lack of antivirus on virtual machine.
Most probably your virtual machine
has been freshly created and the "virtual hard drive" file
is not fragmented.
Second reason is anti-virus. Antiviruses intercept all file
accesses (they hook into system libs)
and they are known to slow down file acces
as much as 2-3 times.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "markhoff" <markhoff@xxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Thursday, February 26, 2009 12:42 AM
Subject: [amibroker] AmiBroker speed-up in virtual machine!?!?
>
> Hi folks,
>
> I have setup a virtual machine (VirtualBox) to have my real account
> trading with IB separated from other tasks. The strange thing is that
> AB runs in the virtual machine much faster than on the native hardware
> (opposite to my expectation that usually virtual machines have a
> performance penalty), but I have no idea why there is this huge
> difference.
>
> Configuration:
> Native machine: Pentium 4, 2.6GHz, 1.5GB RAM, Windows XP SP3 + usual
> tools like antivirus, firewall etc.
> VirtualBox: 512MB RAM, Windows 2000 SP2, naked installation
>
> AmiBroker directory was copied 1:1 from native machine to virtual
> machine, I checked that all preferences are the same.
>
> Benchmark: Backtesting on Russell 1000 watchlist
> native machine: 32s
> virtual machine: 20s
>
> Wow! It looks like something on the native machine is drastically
> reducing the speed of AB, but I have no clue about the root cause.
>
> Did somebody observe the same? Any ideas?
>
> Thanks in advance and best regards,
> Markus
>
>
>
>
> ------------------------------------
>
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>
------------------------------------
**** IMPORTANT PLEASE READ ****
This group is for the discussion between users only.
This is *NOT* technical support channel.
TO GET TECHNICAL SUPPORT send an e-mail directly to
SUPPORT {at} amibroker.com
TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
http://www.amibroker.com/feedback/
(submissions sent via other channels won't be considered)
For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
http://www.amibroker.com/devlog/
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