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Hi,
Windows 2000 is a lean OS compared to XP...
if you use 2 disks in your system placing vhd file on secondary HD can have
a huge impact as well.
Y
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From: "Paul Ho" <paul.tsho@xxxxxxxxx>
Sent: Thursday, February 26, 2009 3:24 AM
To: <amibroker@xxxxxxxxxxxxxxx>
Subject: [amibroker] Re: AmiBroker speed-up in virtual machine!?!?
> 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
>> > >
>> > >
>> > >
>> > >
>> > > ------------------------------------
>> > >
>> > > **** 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
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>> > >
>> > > Yahoo! Groups Links
>> > >
>> > >
>> > >
>> >
>>
>
>
>
>
> ------------------------------------
>
> **** 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/
>
> Yahoo! Groups Links
>
>
>
>
------------------------------------
**** IMPORTANT PLEASE READ ****
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TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
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