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NT8 optimization fills 100% of physical memory then crashes

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NT8 optimization fills 100% of physical memory then crashes

  #11 (permalink)
Arlington VA
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  #12 (permalink)
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  #13 (permalink)
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paulrobert View Post
I am attempting to run an NT8 optimization on a fully-automated strategy called NanoScalper.I have an Intel i7, SSD, and 32 GB of RAM.

Regardless of the number of iterations, the physical memory used climbs to around 100% at which point NT8 crashes. The CPU usage spikes and eventually returns to around 5%, but the physical memory % never decreases.

I have considerably more processing power than what is recommended for NT8, so I am trying to figure out if I need to change a setting within the application.

Thanks in advance!


I believe this to be a bug with NT8.
I noticed the same with several of my strategies that I upgraded to NT 8.
I haven't filed the issue with NT yet. As a workaround, I don't put an extreme level of variables in the strategy to optimize (work 3 or 4 variables each time, with not too many iterations).
After running several times, I need to exit NT8 and come back in, so it will release the memory.

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  #14 (permalink)
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Interesting. I appreciate your help.

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  #15 (permalink)
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If the strategy (or any called indicator) uses drawing elements with individual labels, remove all drawing elements in the code.

This problem I had in version 8.0.3, I do not know if it will already be fixed in 8.0.4, I have not yet migrated.

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  #16 (permalink)
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It actually freezes when the memory is full

I encountered the same problem today. 4-parameters strategy with the built-in strategy builder.

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  #17 (permalink)
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I also had this problem for a few months which drove me nuts and almost had me quitting NT. I have cured it (so far anyway) by doing this:

- Open a new chart and progressively add indicators, until I identified which one gave me problems
- When I have multiple work spaces open I always have one work space with one simple chart only. So no indicators 5 days of data (someting small)...lets call it Workspace A. Then when I close down NT8 I always close every workspace, until I get to the Workspace A, leave that open and then close NT8. So when it re-opens, that Workspace A is the first to start up. Another FIO member gave that tip and it works
- The usual other platform maintenance, re DB Folder.

Now, I think that if a platform is this 'sensitive' there is something not right with the product.


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  #18 (permalink)
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NT8 file management issue it seems

Figured I post here, since there is a memory dump issue for sure with NT8 when running large strategies or optimization. I went from 32 GB to 64 GB ram, and it doesn't matter - it will fill to 100% and slow computer to a crawl - or crash if you try to be "fast". At 16 GB NT8 used to crash, but it was also the previous version, so that may have been addressed (crash issue itself). Now I just click close and wait literally 5 minutes to respond, and once NT8 closes, the speed returns, as physical Ram is released.

What I did was to sync my NT8 folder, and AFTER I closed NT8, I noticed hundreds of files created in my synced google drive folder. Upon closure, NT8 deletes all those files, and so it seems like it just keeps creating and opening more and more files forever in the background, without closing them.

My theory is that WHILE NT8 is running all those files (let's say a strategy for 500+ stocks) continually updates minute data, but rather than opening the new minute data, it also keeps the previous file open. It's a single stock, it should have ONE file that updates, and instead, it creates a new file for every data point it seems - and they must be all being accessed. I'd attach a screenshot of what my sync folder looks like, versus what NT8 folder looks like. However, these files are created in this folder:

DRIVE:\Documents\NinjaTrader 8\db\cache\US Equities RTH.Eastern Standard Time\MINUTE

Open any ticker, and you will see the insanity that ensues, as the program runs longer, until seemingly every file is open as more are being created and left open.

So.... not viable still for continuous usage sadly =(

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  #19 (permalink)
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Should tag @NinjaTrader and open a support ticket, maybe this is a bug instead of by design.

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  #20 (permalink)
Posts: 162 since Sep 2013
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This might be related but off-topic:

I thought I read a thread here somewhere that was a how to guide on this forum to fixing NinjaTrader to get rid of performance / ram issues. Does anyone have a link?

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