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linux_bp  
View profile  
 More options Oct 22, 3:58 pm
Newsgroups: comp.os.linux.development.system
From: linux_bp <rishabh.g...@gmail.com>
Date: Wed, 21 Oct 2009 22:58:58 -0700 (PDT)
Local: Thurs, Oct 22 2009 3:58 pm
Subject: which library is using /dev/zero
Reply | Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author
My C++ application is running on Red Hat Enterprise Linux ES release
3. Our application is growing in size continuously. On taking a pmap
of the process it shows lot of entries corresponding to /dev/zero
which contributes the increase in process size. Is it because of some
OS library or because of any thirdparty library. How can we find out
what is contributing to lot of /dev/zero entries. We are observing
this only in production and not in our lab systems.

"pmapOutCCM.log.int" 852 lines, 51301 characters
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CMM5.0.0/redhat80g/lib/libMgcpProvider.so
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CMM5.0.0/redhat80g/lib/libStatMgr.so
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CMM5.0.0/redhat80g/lib/libCCM.so
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lib/libskgxp9.so
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Common5.0.0/redhat80g/lib/libEmsCommon.so
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006e4000 (108 KB)      r-xp (08:0a 3686426)  /Home1/rsinsp/NSP/
CMM5.0.0/redhat80g/lib/libThresholdMgr.so
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CMM5.0.0/redhat80g/lib/libCCMDbManager.so
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CMM5.0.0/redhat80g/lib/libCCMDbManager.so
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Common5.0.0/thirdParty/TAO/ACE/ACE_wrappers/ace/libTAO_Messaging.so
007d5000 (28 KB)       rw-p (08:0a 1081360)  /Home1/rsinsp/NSP/
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CMM5.0.0/redhat80g/lib/libIvrProv.so
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CMM5.0.0/redhat80g/lib/libBpAinProvider.so
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CMM5.0.0/redhat80g/lib/libBpAinProvider.so
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CMM5.0.0/redhat80g/lib/libCCMMessages.so
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libkrb5.so.3.1
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00a69000 (16 KB)       rw-p (08:0a 1081367)
...

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Rainer Weikusat  
View profile  
 More options Oct 22, 9:41 pm
Newsgroups: comp.os.linux.development.system
From: Rainer Weikusat <rweiku...@mssgmbh.com>
Date: Thu, 22 Oct 2009 13:41:45 +0200
Local: Thurs, Oct 22 2009 9:41 pm
Subject: Re: which library is using /dev/zero
Reply | Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author

linux_bp <rishabh.g...@gmail.com> writes:
> My C++ application is running on Red Hat Enterprise Linux ES release
> 3. Our application is growing in size continuously. On taking a pmap
> of the process it shows lot of entries corresponding to /dev/zero
> which contributes the increase in process size. Is it because of some
> OS library or because of any thirdparty library. How can we find out
> what is contributing to lot of /dev/zero entries.

This is possibly some kind of 'heap growth': Mmapping /dev/zero was
the traditional way to allocate new (virtual) memory from the kernel.
You could use ltrace -CfiS to get a listing of all 'library' and system
calls done by the program and look for mmap using a file descriptor
which refers to /dev/zero. The hexnumber in the first column is the
value of the instruction pointer at the time of the call, ie the
memory address were the corresponding invocation instruction, eg,
call, was located in the running binary. This should enable you to
determine which of the 'running parts' of the program contained the
corresponding code by correlating it with the mmap output and to
locate the offending routine either with the help of a disassembler,
with gdb and a coredump or by attaching the debugger to the running
process and inspecting its memory.

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David Schwartz  
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 More options Oct 27, 8:34 am
Newsgroups: comp.os.linux.development.system
From: David Schwartz <dav...@webmaster.com>
Date: Mon, 26 Oct 2009 14:34:19 -0700 (PDT)
Local: Tues, Oct 27 2009 8:34 am
Subject: Re: which library is using /dev/zero
Reply | Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author
On Oct 21, 10:58 pm, linux_bp <rishabh.g...@gmail.com> wrote:

> My C++ application is running on Red Hat Enterprise Linux ES release
> 3. Our application is growing in size continuously. On taking a pmap
> of the process it shows lot of entries corresponding to /dev/zero
> which contributes the increase in process size. Is it because of some
> OS library or because of any thirdparty library. How can we find out
> what is contributing to lot of /dev/zero entries. We are observing
> this only in production and not in our lab systems.

My bet is it's glibc's 'malloc' implementation.

DS


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