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From Sunitha Kumar <>
Subject Re: track memory leaks in apache.
Date Tue, 30 Oct 2001 23:10:09 GMT

Thanks much for the response. What we see here, is malloc_block is being
called repetitively.
is there some way to determine which blocks are not being released?


Aaron Bannert wrote:

> On Wed, Oct 24, 2001 at 07:04:07PM -0700, Sunitha Kumar wrote:
> > Wanted to find out if there was any thread or documentation which speak
> > about this.
> > Also, the apache documentation refers to an alloc.c file. Where is this?
> >
> > And, what are the tools that people have used for tracking leaks,
> > Efence, zmalloc, dmalloc, purify?
> That's actually a difficult question to answer with Apache. Because it
> uses pools almost exclusively (there are some places that use malloc,
> but they are special cases) it usually becomes obvious very quickly
> if there is a memory leak problem. Pools, if you are not familiar with
> them, basicly allow us to "checkpoint" memory de-allocations at certain
> points in our code, instead of having to call free() for every malloc().
> This gives us a couple of benefits: 1) memory management overhead is
> dramatically reduced (O(n) free() calls vs O(1), plus free-list management
> overhead with increased fragmentation), and 2) third-party modules that
> use pools can perform safe memory allocations and don't have to worry
> about cleaning up.
> It is still possible for memory leaks to occur, but the likelyhood of a
> slow leak is IMO reduced with the use of pools.
> Are you having a specific problem that we might address?
> -aaron

Sunitha Kumar

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