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Any information on this would be helpful. If there are any good articles I should read on this, please let me know. Beside what monkeyboy writes you have to deal with the fact that a 32bit application can use maximum use 2Gb. There is an option outside VB so not really something you want to use to add another 2Gb but then you are at the absolute maximum. With a 64bit application running of course on a 64bits computer there is also a limit, but that is so high that it is currently almost never a problem.
However, the total size of an array is also limited by the memory available on your system. If you attempt to initialize an array that exceeds the amount of available RAM, the common language runtime throws an OutOfMemoryException exception.
When setting your working set, be careful to leave some free memory for the system and other application, otherwise you system performance will go down.
For the type of application you have described I think the two-dimensional array is most suitable. When you do this, Visual Basic creates a new array and releases the previous array for disposal. I would guess that means that there can be two copies of the array object while the redim executes and until the GC cuts in. Can you avoid redimming the array? If you can't, then a list might overcome the problem of changing the size without creating a copy.
Thank you all for the responses. I know about the array size limits, but my arrays don't reach the size limit. Additionally, when looking at how much memory the program is using, it is only around 10 MB, so nowhere near the 2 GB limit for 32 bit application or the 16GB on my computer.
Is there something with VB applications that limits the amount of memory they can access? Just not sure why it is giving me this error. If I reduce the size of the array, it works fine, but in order to carry my analysis all the way through, I need the full array. Crazypennie, I will look into what you have posted there.
I have never heard of it before, so will have to read up on it. Net Framework 4. In a more extreme case the memory savings could be significant. How did you come up with the 10MB figure? That sounds really low, though we don't know anything about the application So first I would want to verify the actual reported memory usage.
You can monitor the value of My. WorkingSet while your routine runs to verify memory usage within your program. The next thing would be to check for memory leaks and to optimize your code for memory consumption. Generally this error means that you have a memory leak condition or you are trying to work with far too much data at one time.
WorkingSet while your routine runs to verify memory usage within your program. The next thing would be to check for memory leaks and to optimize your code for memory consumption. Generally this error means that you have a memory leak condition or you are trying to work with far too much data at one time. Check to make sure that you are cleaning up after yourself where required and look at your data analysis routine to determine if it can be broken into more managable chunks.
Modifying the default memory management should be the absolute last resort. This sounds like the kind of problem that should be solved by improved processing routines rather than by raw processing power, but again we don't know much about the application so maybe not. Out of curiosity, how much memory are we talking about here? Reed Kimble - "When you do things right, people won't be sure you've done anything at all". So the array is set up as a public array, because multiple routines need to access it though not a the same time.
It is an array of stored results values, so each time I decide to run a new analysis, the program re-dimensions the array without preserving values so that the array values are cleared.
This is where the error occurs. On the amount of memory, I think it was just an estimate, as I was looking at my task manager to see the amount of memory. I can see what I get when tracking the WorkingSet. I do dimension a number of large arrays right at the beginning of the process. Like I said, I have multiple large 3 dimensional arrays, and about a dozen reasonably large 2-dimensional arrays x The program must keep track of many history variables while at the same time recording analysis values at every increment.
And I have never heard of List T before. I don't know how it is different from arrays, the advantages and disadvantages, etc. I am using arrays because I need to be using multiple indices. They are just arrays declared as Double, as the only values that should be going into them are Double values. A List T actually has a larger memory footprint than an array does; that said though, a List T is dynamic.
It's a type of collection so if you want to add to that collection, you add to it -- if you want to remove from it, you remove from it -- and, finally, if you're done with it, you can clear the elements completly effectively telling it to "empty itself".
Anything that you can use an array for, you can use a List Of Double for and with a list, you don't have to worry about the number of elements in that list. You need to look closely at the code you are using here to make sure that you are not creating a copy of the exiting arrays, thus requiring twice the memory you think you need.
At the beginning of each analysis, I call:. Frank, thank you for explaining the List T to me. However, I am still a little confused, since the MSDN examples on the help page only show 1-dimensional. Would I say, add rows to the list? Or can I add to a list in a similar manner as an array?
But anytime I see multi-dimensional arrays, I wonder if there's not a better way to go about doing it and [almost] always there is. If you'd care to explain more about what you're doing I feel sure the brilliant folks here will have some guiding tips.
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