LVOOP technique for passing classes down to subVIs

Hello LVOOP experts,
A quick question regarding performance of LVOOP. I finally got around to implementing something non-trivial with LV classes, just for fun though.
If my architecture consists of a state machine, with a typedef'ed shift-registered cluster (containing all my core classes) being passed around the main loop and into subVIs, is there a performance penalty if the classes contain lots of data?
My question arises from my only passing knowledge of how LV classes work. As they are byvalue, does this mean ALL the data gets copied/moved between every state, and into every subvi? Or is the compiler smart enough to know that if I am passing the main cluster into a subVI it doesn't necessarily need to make a copy of the data unless I am forking it or something.
Fictional example, one of the classes is a data storage and has 1M DBL values in it, is this going to cause lots of memory allocation? (If so then its better probably to not store the data directly in the class, rather have a queue or some other byref storage, right?)
Comments appreciated :-)
n
nrp
CLA

nrp wrote:
Mark Yedinak wrote:
My understanding is that LVOOP objects are passed by value. So you would indeed take a hit if you are passing large objects around.
Thats as much as I suspected, thanks for the confirmation.
My big problem is I have not seen a reference implementation of how to do it right. I sure wish NI would provide some intermediate example rather than dog/cat or car/truck.
The closest I have seen in DfGrays Xylophone set of tutorials, but then he complicates things by using a singleton type approach (dequeue --> use object --> requeue) and a strange (to me) architecture with lots of registered events and an event structure as one of the cases of the main state machine loop.
Does anybody have a non-trivial, but freely distributable example of doing classes the right way? I know there are probably a dozen or so ways of doing it right, but there must be some common ground.
I spent the weekend mucking about and have something which I will present once I have tidied it up a bit.
But the overhead is probably negligible for non-storage type classes, i.e. the classes that define the
HI Mark and Neal (?)
The Pass by value story is starting to shape as a misnomer (sp? bad name).
1) If I do a Show buffer allocations when a class wire splits, the buffer does not show-up under clusters of array but rather as a scalar.
2) You can type cast the class ref as a U32 and you get a number.
3) When using Dynamic Dispatching you have to have the class control and indicator on the icon connector, so all of the requirements are present for the sub-VI (method) to work in-place using the bufer that was pointed to by the caller.
So passing the data in a class is about the same as when working with clusters. If LV can avoid the copy it will.
But where you will take a hit...
When we fork a class wire there is a buffer allocated. Too many splits could cause problems. As long as we string together lines of VLOOP methods, they should use the same buffer.
BTW:
I did have to do a re-write of one of my early LVOOP projects because I was splitting a class with a Image data in it. The re-wire skipped using the class and just passed the image data (via a queue between threads).
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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very costly.
Here is a good article about this issue, please take a look.
Reflection is Slow or Fast? A Practical Demo
Q2:Or is there any performance optimization for this method?
The article presents some .NET techniques for using Reflection optimally and efficiently.
optimizing object creation with reflection
Note optimize
reflection with Emit
method.
Best regards,
Kristin
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Hello Kristin
Please can you tell how I optimize reflection in my code.
public List<T> DisplayCitiesT<T>(T TB, string spName)
var categoryList = new List<T>();
using (SqlConnection connection = GetDatabaseConnection())
using (SqlCommand command = new SqlCommand(spName, connection))
command.CommandType = CommandType.StoredProcedure;
foreach (var prop in TB.GetType().GetProperties())
string Key = prop.Name;
string Value = Convert.ToString(prop.GetValue(TB, null));
if (!string.IsNullOrEmpty(Value) && Value.Contains(DateTime.MinValue.ToShortDateString()) != true)
command.Parameters.AddWithValue("@" + Key, prop.GetValue(TB, null));
SqlDataReader reader = command.ExecuteReader();
while (reader.Read())
int i = 0;
TB = Activator.CreateInstance<T>();
int colCount = reader.FieldCount;
foreach (var prop in TB.GetType().GetProperties())
if (prop.Name != "result" && i <= (colCount - 1))
prop.SetValue(TB, reader[prop.Name], null);
i++;
categoryList.Add(TB);
return categoryList.ToList();
Thank you.
Owner | Software Developer at NULLPLEX SOFTWARE SOLUTIONS http://nullplex.com

Support for generic classes

hi,
i m using creator 2 update 1, it does not support generic classes.
it says use source 1.5 for generic classes.
please tell me how to solve this problem
thank you

Well, not necessarily true... Most of the latest graphics cards work off of a common core, which is named depending on its maximum tested performance and on how many pipelines passed quality checks.
Thus a 7300 is fundementally identical to a 7800, except that it uses fewer fragment/vertex pipelines and is clocked lower. This is done either artificially by disabling parts of the GPU, or if when they fail quality control.
Either way, the drivers are the same, and have been unified for a long time for the entire product line. In fact if you look at the drivers for the card in yoru computer you will see they are more then likely for a different chipset. My MBP claims the drivers are for a X1000, even though the card is a X1600.

LVOOP technique for passing classes down to subVIs

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