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It's also extremely misleading. What Sidney is doing is trying to
get the RANKings on 280 stocks as opposed to ranking 280 stocks and
trading the top n. Yhis will not only use a huge amount of memory
but it will slow the process down by better than 50 x 1.
--- In amibroker@xxxxxxxxxxxxxxx, "mrdavis9" <mrdavis9@xxxx> wrote:
> Sidney, thanks a lot. Information such as this is enormously
valuable to computer challenged users such as myself.
> I crave this kind of information. Ron D
>
>
>
>
> ----- Original Message -----
> From: Sidney Kaiser
> To: AmiBroker@xxxxxxxxxxxxxxx
> Sent: Friday, June 27, 2003 12:46 PM
> Subject: [amibroker] PT and memory usage
>
>
> I am running a Portfolio Trader scan this morning and thought
this
> information might be helpful to other users.
>
> PT scan, 16 iterations on ~280 stocks for 6 months: I have had
memory
> problems with this scan so I decided to monitor what was going on
by using
> the Windows Task Manager, ( win 2k, win xp ) cntl-alt-delete to
invoke
>
> I was not sure AB was running so I started there.
>
> WTM processes tab: sure enough Broker.exe was getting 98% of the
CPU cycles.
>
> To check the memory usage go to the WTM Performance tab: the
interesting
> things here is the Page File usage chart and the Physical Memory
statistics.
>
> At first you can watch the executing programs eat up your
physical (RAM)
> memory. It sucked down my 1024 Mb of RAM to about 5Mb before it
started to
> do serious disk swapping for temporary storage. At the moment
the scan is
> still running and the Page File usage is up to 1.75 Gb. If you
run out of
> Page File space the program will crash with (probably) an out of
memory
> error message.
>
> You can monitor your system to see how a big scan is doing. If
you have
> some spare HD space you can increase the Page File size.
>
> Note: exit all running programs before you attempt changing the
Page File
> size or you may regret the resulting occasional crash...
>
> start/control panel/system/advanced/performance
settings/advanced/virtual
> memory change/
>
>
> The recommended settings at the bottom of the page will probably
be too
> small. Use the custom setting to increase the min/max Page
> File settings. At the moment I am using 2Gb min and 4 Gb max.
Reboot to
> have the settings take effect.
>
> Cheers
> Sid
>
>
>
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