File size and Performance

[Collin Goredema]

If I am writing to a file in Java, does the size of the file take space from the allocated memory heap? How would a 129mb file affect performance?

[Viswanathan Nachiappan]

I guess the file takes the space from RAM and not the HEAP. Hence we can work with large files (i.e. the RAM is capable of...)

Please Advise.
viswa

[Jesper de Jong]

It depends on your program.

Just opening a file (by creating a FileInputStream for example) does not take up a huge amount of memory and the memory usage is not dependent on how large the file is.

If you write a program that loads the whole contents of the file into memory, then yes, your program will need a lot of memory. But then it's your own code that's doing it, not the code in the standard Java library.

[Viswanathan Nachiappan]

String command = "script.bat";
Process p = Runtime.getRuntime().exec(command);
InputStreamReader isr = new InputStreamReader(p.getInputStream());

I get an InputStream form the above Process, Does anyone knows where this InputStream is stored ( RAM / HEAP )???

Thanks in Advance,
viswa

[Joe Ess]

Viswanathan, your post has been answered more than once. If you are still confused, why don't you follow up one of those other posts rather than starting new conversations?