RE: GDB STL Memory Usage Issue

["Jude Moersdorf" <Jude dot Moersdorf at pt dot com>]

Is your application multi-threaded?  If so, are many threads created and
destroyed?  Check that you don't have a bunch of zombie child threads
that need to be reaped.

-----Original Message-----
From: gdb-owner@sourceware.org [mailto:gdb-owner@sourceware.org] On
Behalf Of Ravi Ramaseshan
Sent: Tuesday, April 10, 2007 7:36 AM
To: Mark Kettenis
Cc: gdb@sourceware.org
Subject: Re: GDB STL Memory Usage Issue

On 4/10/07, Mark Kettenis <mark.kettenis@xs4all.nl> wrote:
> > Date: Mon, 9 Apr 2007 19:40:58 -0400
> > From: "Ravi Ramaseshan" <ramaseshan.ravi@gmail.com>
> >
> > Hi,
> >
> > I observed some strange behavior with the following system that I
> > would like to know more about:
> >
> > I'm compiling a very memory intensive C++ application that uses STL
> > (hashmaps of lists). Every few seconds I erase() the entire hashmap
> > (and the lists). When I run the program standalone and examine the
> > memory usage using top, I see the total virtual memory of the
program
> > grow (sometimes to 60+MB) before the erase call and after the erase
> > call drop down to a few MB - which is the behavior I would expect.
> >
> > However, when I run the same program through GDB, the erase() does
not
> > seem to have any effect and the virtual memory usage keeps on rising
-
> > which I do not understand.
> >
> > I am using GCC 4.0.3, GDB 6.4 and am compiling the program with
> > debugging information. I would like to understand the reasons for
such
> > a behavior of my program under GDB.
> >
> > Thanks in advance,
>
> Smells like an operating system bug to me.
>
>

I am running an Ubuntu system 2.6.15-28-686 kernel, if that helps
anyone explain the problem I observed.

-- 
Ravi Ramaseshan
http://www.geocities.com/ramaseshan_ravi/

" Reality is only something we believe in strongly. "