I did it with Xmx256M and it does indeed seem to flatten (at about 300 MB). Also with Xmx150M it flattened at about 260M. So, I will try to investigate further, why and under what conditions it does fail..
Klaus Am Sonntag, 9. Dezember 2012 13:18:58 UTC-5 schrieb nonlinear: > > The default starting option for JBT is "aggressive > heap": -XX:+AggressiveHeap > This is meant for the use when you are optimizing. When backtesting, > forward-testing, and trading, you may want to use a less aggressive option, > for example: > -Xmx=256M > > Can you try that and see if you still observe the same issue as you > reported? Thanks. > > On Sat, Dec 8, 2012 at 9:55 PM, Klaus <[email protected] > <javascript:>>wrote: > >> Well, what I observe is that when I run a strategy with JBT, it (of >> course allocates memory), when next thing I run a different strategy more >> memory is allocated. >> I just tried it with the sample data and the distribution JBT. Only >> change was to create 20 copies of the Sample strategy. It rapidly builds >> up from 250 to about 350 MB when more strategies are run. >> There the curve flattens at some point. >> However it is a small data set. I have the problem that if I do the same >> with my installation and my dataset I see a much larger initial >> memory allocation and actually a similar build up of memory allocation. >> Thus, at some point it hits the wall and I have to restart JBT to run more >> strategies. This seems to be in line with the aymptotic build up of memory >> use. >> >> Klaus >> >> >> Am Montag, 3. Dezember 2012 09:27:58 UTC-5 schrieb nonlinear: >>> >>> Charts can (potentially) use enormous amounts of memory, because all of >>> the historical data with regards to prices and indicators is preserved. For >>> that reason, in JBT, you can show charts only one at a time. That is, the >>> chart becomes available after you run a backtest for a given strategy A. If >>> subsequently you run a backtest for strategy B, the chart for B becomes >>> available, and the chart for A is no longer in memory. >>> >>> On Sun, Dec 2, 2012 at 8:19 PM, Klaus <[email protected]> wrote: >>> >>>> It seems that >>>> a) if I start a back test of a different strategy, I can no longer >>>> display an earlier chart. >>>> (says: run the strategy first) >>>> b) on the other hand, it seems that if I run a number of different >>>> strategy, the memory >>>> is later on not (completely) freed. - I thought this would be the >>>> charting data. >>>> >>>> While both make from their respective point of view sense, both at the >>>> same time do not >>>> make much sense. - Or is the loss of memory s.th. different? >>>> >>>> Klaus >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "JBookTrader" group. >>>> To view this discussion on the web visit https://groups.google.com/d/** >>>> msg/jbooktrader/-/_UDw8OUOQLQJ<https://groups.google.com/d/msg/jbooktrader/-/_UDw8OUOQLQJ> >>>> **. >>>> To post to this group, send email to [email protected]. >>>> To unsubscribe from this group, send email to jbooktrader...@** >>>> googlegroups.com. >>>> >>>> For more options, visit this group at http://groups.google.com/** >>>> group/jbooktrader?hl=en<http://groups.google.com/group/jbooktrader?hl=en> >>>> . >>>> >>> >>> -- >> You received this message because you are subscribed to the Google Groups >> "JBookTrader" group. >> To view this discussion on the web visit >> https://groups.google.com/d/msg/jbooktrader/-/BrvC38YGFrkJ. >> >> To post to this group, send email to [email protected]<javascript:> >> . >> To unsubscribe from this group, send email to >> [email protected] <javascript:>. >> For more options, visit this group at >> http://groups.google.com/group/jbooktrader?hl=en. >> > > -- You received this message because you are subscribed to the Google Groups "JBookTrader" group. To view this discussion on the web visit https://groups.google.com/d/msg/jbooktrader/-/H6rI2sRGd_wJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jbooktrader?hl=en.
