Subject: Re: Swap overcommit (was Re: Replacement for grep(1) (part 2))
To: None <,>
From: Daniel Eischen <>
List: tech-userlevel
Date: 07/16/1999 13:16:40
>     I'm sorry, but when you write code for a safety related system you
>     do not dynamically allocate memory at all.  It's all essentially static.
>     There is no issue with the memory resource.  Besides, none of the BSD's are
>     certified for any of that stuff that I know of.

Sometimes it's not feasible to statically allocate memory.  You
dynamically allocate all the memory you need at program initialization 
(and no, we don't want to manage a pool of memory ourselves - that's
what the OS is for).  

Note that languages such as Ada raise exceptions when memory allocation
fails.  The underlying run-time relies on malloc returning null in
order to raise an exception.  Normally, programs written in Ada
take great care to gracefully handle these exceptions.  All the C
programs that we've ever written also take great care in handling
NULL returns from malloc.

I have no problem with overcommit, but I can see the need that
some folks have for turning it off.  If you don't want to write
the code to allow this, that's fine - you don't want/need it,
so why should you?  But if other folks see a need for it, let
_them_ write the hooks for it :-)

Dan Eischen