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Markus
It depends on how much data is being cache, whether Ab needs to go
and retrieve any information. anti-virus, sometimes even scanning
stuff in memory. the most reliable way is to completely de-install
your anti- virus and do the test again. --- In
amibroker@xxxxxxxxxxxxxxx, "markhoff" <markhoff@xxx> wrote:
>
>
> 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@>
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@>
> > 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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> >
>
------------------------------------
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