Tomorrow, I will try to close the file(s) at different interval to see what happen.


Thanks :-)


>>(VFP 7 SP1 on Windows 2000 or Windows XP pro)
>>
>>I have to perform 3 operation on a text file.
>>
>>1 - read a line from a text file.
>>2 - perform some operations on the string.
>>3 - write the line in another file.
>>
>>The text file was really big (950 mb).
>>
>>The program run fast for the first ~50 mb but after that it start to slow down (crawl).
>>The computer have 1 gb of memory an 100 gb of available disk space.
>>From the task manager I can see that only around 200 mb was used during the operation.
>>
>>What is the best way to open the files? buffered/unbuffered?
>>Flush when I reach a certain point in the file? every 10 mb?
>>How can I optimize the process to use all available memory and speed up the process? some sys() function to use?
>>
>>TIA :-)
>
>I never heard that such a problem existed.
>
>How about re-opening the file every 1 MB or so? Before closing, you would have to save the current position, and then restore it later.
>
>HTH, Hilmar.