From: Preben Randhol <randhol+news@pvv.org>
Subject: Array and memory usage
Date: Sun, 9 Mar 2003 11:19:07 +0000 (UTC)
Date: 2003-03-09T11:19:07+00:00 [thread overview]
Message-ID: <slrnb6m8mg.15o.randhol+news@kiuk0152.chembio.ntnu.no> (raw)
I was a bit puzzeled to see that if I do:
type Str_Array_Type is array (1 .. 1000) of String (1 .. 800);
type User_Data is
record
Name : Str_Array_Type;
Hostname : Str_Array_Type;
end record;
my program uses 800 bytes of memory, while if I only change the program
like this:
type User_Data is
record
Name : Str_Array_Type := (others => (others => ' '));
Hostname : Str_Array_Type := (others => (others => ' '));
end record;
then the program uses 2356 bytes.
I thought all the memory needed for an array would be claimed when the
program started no matter if the array was filled or not.
Is this correct or am I just being tricked by the program that measures
the memory used by my program?
If it is correct then it doesn't matter if I define my array as (1 ..
100) or (1 .. 10_000) as long as I don't initialize the strings.
I can just add to User_Data a:
type Used_Type is array (1 .. 1000) of Boolean;
Used : Used_Type := (others => False);
And then I don't need to add any linked list etc... to my small server.
I use GNAT 3.14p on i386 Linux (Debian).
Thanks in advance
Prebene Randhol
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next reply other threads:[~2003-03-09 11:19 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-09 11:19 Preben Randhol [this message]
2003-03-09 11:52 ` Array and memory usage John R. Strohm
2003-03-09 12:11 ` Preben Randhol
2003-03-09 13:34 ` Marin David Condic
2003-03-09 15:05 ` Preben Randhol
2003-03-10 1:45 ` Mark Biggar
2003-03-10 11:57 ` Marin David Condic
2003-03-10 12:06 ` Jeffrey Creem
2003-03-09 17:49 ` Robert A Duff
2003-03-09 17:04 ` Jeffrey Creem
2003-03-09 17:09 ` Preben Randhol
2003-03-09 18:10 ` Robert A Duff
2003-03-10 15:13 ` Matthew Heaney
2003-03-10 23:33 ` Robert A Duff
2003-03-11 0:40 ` Randy Brukardt
2003-03-11 23:37 ` Robert A Duff
2003-03-12 19:18 ` Randy Brukardt
2003-03-11 16:01 ` Matthew Heaney
2003-03-11 17:38 ` Warren W. Gay VE3WWG
-- strict thread matches above, loose matches on Subject: below --
2003-03-12 22:04 Alexandre E. Kopilovitch
2003-03-12 22:20 ` Larry Kilgallen
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