Allocation/Memory Leak question_(re)

Sat, 26 Jul 1997 12:50:28 +0200 (MET DST)

According to Ken:
>
> program allo2;
> var
>    mm: array[1..500000] of real;
>    indx : __long__ integer;

(* JFYI, `__long__ Integer's have 64 bits.  For your program, an ordinary
32-bit `Integer' would be sufficient. *)

>    ma: array[1..500000] of real;
> [...]

> This program realy does nothing of value but when the second FOR
> loop is running, the program starts eating up memory.

Really at the second FOR loop, not already at the first one?
I don't know the details of the memory management of Linux, but
AFAIK, the storage is physically allocated when the array is
referenced.

> According to TOP,
> the program uses 8094 kBytes just before the loop ends.  Why should
> this program be so memory hungry at that time?  [...]

Simply because one `Real' has eight bytes, and you are allocating one
million of `Real's.  8000000 bytes are 7812.5kB; if you include code,
runtime library, etc., 8094kB seems realistic for me.

    Peter

 Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer
peter.gerwinski@uni-essen.de - http://home.pages.de/~peter.gerwinski/ [970201]
 maintainer GNU Pascal [970714] - http://home.pages.de/~gnu-pascal/ [970125]

Peter Gerwinski (peter@agnes.dida.physik.uni-essen.de)