Hi,

My Strategy trades on about 28 currency pairs (maximum 4 orders at the same time).

When I'm testing the strategy with the tester, all works well if I unpick "Visual Mode", but if I choose to
backtest in "Visual Mode" in order to see what's happening, I have a "Strategy tester: java.lang.OutOfMemoryError: Java heap space"
after about 15 days of backtest. I'm not drawing any graphics on the charts.

Is their a way to force Jforex to clean the memory ? or with java...
Again the problem only occurs in "Visual Mode" so I think their could be a leak in the JForex GUI when it shows the 28 charts.

All ideas are welcomed !

Thanks

At the current implementation there is no such thing. However starting with the next version one will be able to choose which charts to show and which - not.
You might consider increasing java heap size.

Thank you for your response.



How do you do that ?

If a chart hasn't been opened during the backtest to save memory, how can you then see the closed orders on that chart ?


Thanks

This will be available with the next release of JForex client.
Obviously you can't see an order on a chart if Visual mode has not been selected at the beginning of backtesting. However, you can find all of your order information in the report file, also you might consider logging any specific order data. Also as an alternative you might consider using Standalone API, and more particular the example TesterMainGUIMode, which allows you to display particular charts while backtesting. Start from here:
https://www.dukascopy.com/wiki/index.php ... in_Eclipse
Also see:
viewtopic.php?f=65&t=41666&p=53517

Hello support,





Is this option now available ? How can I choose the charts to open in the tester ?

Best regards

As mentioned before, this will be available with the next release of JForex client.

Hi nicofr0707,

if you have enough RAM available on your PC, you could increase the initial and max heap size through editing the jnlp file. You would have to download the jnlp, open it with a text editor and increase the heap size entries to for example the values shown here in blue:



When using multiple instruments in our backtesting including charting, we always increase the max heap size to about 2gb (=2048m) or more.

You then would have to start the client using this modified jnlp file. Please don't forget to download a new jnlp file every time a new version of the client is released.

Best, RR.

Hi Roadrunner,

Thanks for your response, it is exactly what I did by adding 12gigs of ram in my computer and a heap space of 8192m.
For those who have issues to, you have to install the 64bit version of java in order to take advantage
of more than 2000m of heap-space...

Best regards

Could you explain how to allocate 8 GB for JForex?
What steps have to be done?

@SFXbernhard

Instead of running JForex from dukascopy.com, you should download the jnlp file on the hard drive.

Edit it and search for the following line :
<java version="1.6+" initial-heap-size="32m" max-heap-size="512m"/>

set the max-heap-size to the value you want.

Then run JForex from the modified jnlp file on your hard drive. Be aware that if Dukascopy
makes a JForex update, your have to redownload the new jnlp file and redo the previous
described steps.

Best regards