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Hi Tomasz,
during the benchmark I made sure that all data is in the AB cache (by
rerunning multiple times, 1st run after AB start is ~30% slower than
subsequent runs), therefore anti-virus should not be the reason. I
just checked this by switching AV off on the native machine, the
result was the same as before, the VirtualBox is still much faster. I
think disk fragmentation is same story, as long as the data is cached
it should not have an negative impact ...
Best regards,
Markus
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>
> 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@xxx>
> 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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