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RE: [bug #18396] stack size setrlimit call interacts badly with Solaris

From: Paul Smith
Subject: RE: [bug #18396] stack size setrlimit call interacts badly with Solaris/x86 kernel bug
Date: Wed, 29 Nov 2006 00:30:10 -0500

On Tue, 2006-11-28 at 18:45 -0800, Martin Dorey wrote:
> > Using heap, which requires a system call to get more memory
> (It doesn't affect the main point of Paul's reply but just for academic
> interest) no it doesn't:

> Even in less contrived applications, brk isn't called anything like as
> often as malloc.

Certainly that's true... I didn't mean to suggest every call to malloc()
resulted in a system call.  But using the heap DOES require a system
call to get memory... obviously the C runtime will grab memory in much
larger chunks and maintains a free pool, with algorithms to handle
fragmentation and coalescing of free blocks, etc.  There are whole
dissertations written on the most efficient ways to manage heap :).

But (as I'm sure we both agree) alloca() is unquestionably more
efficient (assuming you have an appropriate amount of stack).

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