Re: Does Squid push the data-segment size limit?

From: Michael Pelletier <>
Date: Tue, 10 Feb 1998 10:53:23 -0500 (EST)

On Thu, 5 Feb 1998, Dancer wrote:
> Programs get started with a default 'heap'. That is, they get enough space to
> store global variables and whatnot, and a pool for malloc. That's their data
> segment. If you start mallocing chunks of memory, the heap will run out of space,
> and malloc() calls sbrk() to extend the size of the data segment to get more.
> They key thing here is that space allocated with sbrk() _cannot_ be given back to
> the operating system until the process _terminates_. Once your data-segment size
> has been increased, that's it. As long as your process runs, that memory is
> assigned to it, and it cannot be given to any other process. You can free() every
> byte, but you're still stuck with it.

Thanks for all the detail! I recompiled the kernel with a MAXDSIZ
parameter bumped up, and now Squid is running happily at 131MB of memory,
without crashing after passing the 128MB mark as it used to.

Thanks again...

        -Mike Pelletier.
Received on Tue Feb 10 1998 - 08:03:31 MST

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