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NT8 RAM Memory Bloat Testing new indicators before use
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NT8 RAM Memory Bloat Testing new indicators before use

  #1 (permalink)
Elite Member
New York, NY
 
Futures Experience: Intermediate
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NT8 RAM Memory Bloat Testing new indicators before use

"Converting-ninjatrader-7-indicators-ninjatrader-8-free" thread had posts that may become obscured by the size of the 50+ page thread's growing popularity. They are important notes and are thus being composited into this thread for coders and especially non-coders (cut and pasters) to be informed:

NT8 traders should not naively accept new versions of custom indicators, including from commercial sources (who should know better, but experience has shown otherwise) until the indicator-writing community has NT8 nuances under its belt. All new NT8 indicators including updated versions should be treated carefully.

Follow @Zondor's advice about segregating a test environment for the indicator until you are certain of it. And do it one indicator at a time, on an otherwise bare chart each time. Otherwise, you are never going to know where the problem is, if there is one from your custom indicator(s.)

There are other issues with NT8, which others have pointed out, and these are just a matter of growing pains. They will be fixed. But if NT does not change their mind about coders needing to manually add code to manage memory (in those situations where it's needed), then we will just have to hold on until the coding community knows what to do, and when.


Zondor View Post
Edited advice:

Start with NT disconnected from your data provider.

In a new, dedicated test workspace, create a chart with many instances of the indicator to be evaluated. But no indicators other than that one.

Then clone the chart, make a bunch of these single indicator charts possibly with different instruments or timeframes.

Log on to your data provider and watch the RAM usage in Windows Task Manager using CTRL-Alt-DEL, Task Manager, Performance tab. Once loaded memory should be fairly static if there are no issues.

Or run the chart in Playback mode as fast as you can.

If the RAM usage goes up up up as Ninjatrader runs, that's a FAIL.

Do this for every indicator that you add. This will avoid creating an unmanageable mess that will have you singing the "Ninjatrader 8 not ready for prime time " Blues.

An example reported as possibly having this type of issue is the March 25th version posting:

https://futures.io/local_links.php?action=ratelink&catid=27&linkid=1843

The author udated the post with: Its been brought to my attention this indicator may or may not use excessive RAM. Word of caution if you have issues using this indicator. I personally have not had issues besides sluggishness moving the x-axis.

Original coding concern comment was:

The fractal pivot indicator provided is a memory devouring, RAM hog disaster.

The kind of indicator that will make you think that "NT8 is not ready for prime time".

It keeps drawing more and more unique and separate text objects, lots of them. Each one uses more RAM. None of them are ever removed. This is the worst possible way to plot horizontal lines.

The longer it runs, the more RAM it will use. Until Ninjatrader freezes, or until you shut it down voluntarily, whichever comes first.

----------------
In the meantime, NT8 does seem like a great platform, assuming you don't want to get too far into customized indicators. For example, it is way faster (you do need a somewhat decent computer, but not a great one) and has many user-oriented improvements. But indicator-writing is not yet widely reliable.

Be cautious.

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  #3 (permalink)
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It has also been talked about here: https://futures.io/ninjatrader/20380-release-date-ninjatrader-8-a-29.html

Yes even indicators from commercial vendors can cause the issue such as what I mentioned regarding OFA. I am very wary about many indicators offered for free even on this forum because it appears amateur coders are not taking into account the memory management aspects. Luckily I do not use many indicators for trading so I am able to quickly narrow down which ones to avoid.

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