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Filestream Out of Memory Error

Posted on 2004-04-26
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Last Modified: 2012-05-04
I am running VB.NET my machine has 2GB of ram. My program extracts and sorts large amounts of financial data (1.5GB+). I have tried using the filestream and stremreader methods. I consistantly recieve 'System.OutOfMemoryException'. I have duplicated this error on blank form with only a command button containg the code. I hit the button after each iteration (replicating the loop in my program) and watch the RAM in the task manager keep going up until it hits the 2GB marker, then I receive the out of memory exception.This happens 9/10 times. Sometimes the ram gets to about 1.5GB then the system finally releases the unused resources. There is no pattern or set amount of time to when it decides to finally realease the unused resources. It seems like the OS isn't receiving the message to release the data. The file tradefile.l is 385MB. It is from the New York Stock Exchange TAQ Database and was obtained via FTP. I ran this code using the FSO in VB 6.0 without error for months. I would rather use the filestream method because it is about 5X faster than the FSO. Thank You.

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  Dim s As String
  Dim readBytes(91000000) As Byte
  Dim fsstream As New FileStream("D:\TRADE DATA\TESTING\TEMP _
  FILES\tradefile.l", FileMode.Open, FileAccess.Read)
  fsstream.Read(readBytes, 0, 90999999)

  s = System.Text.Encoding.ASCII.GetString(readBytes)

  fsstream.Flush()
  fsstream.Close()
  s = ""
  Erase readBytes
End Sub



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Question by:EBarefoot
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Expert Comment

by:BrianGEFF719
ID: 10924915
do you really need to load the entire 1.5gb into memory, is this really neccesarry, can you not load it in 15 100mb chunks and process it as you go...


-Brian
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Author Comment

by:EBarefoot
ID: 10925103
I am already doing that. The code above is what I am using in the program and if I am correct it is just less then 100MB. Thank you for the suggestion.
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Author Comment

by:EBarefoot
ID: 10925372
SOLUTION:

System.GC.Collect()

The garbage collector is a service that automatically reclaims unused memory.
The Collect() method forces a garbage collection rather letting the system pick the best time.

How do I close this thread? Thank You.
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LVL 19

Expert Comment

by:BrianGEFF719
ID: 10925547
Go ahead and goto the Community Support area and post a link to this question requesting that it be delete and points refunded.


-Brian
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ID: 11256534
User resolved; closed, 250 points refunded.

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