Hi,
Is there any detail documentation that can explain how to decode the
ckpt_*.dmtcp file ?
i.e. decode
1) the header section
2) the header for each contiguous memory area (addr range, permissions, etc.)
3) the data for each contiguous memory area
I want to know exactly where are the heap, the stack and dynamic libraries,
etc. in the ckpt_*.dmtcp file
Having a documentation is a easier than reverse engineering the code :-)
Thank you in advance for your reply.
Best regards,
Ramy Gad
Johannes Gutenberg - Universität Mainz
Zentrums für Datenverarbeitung (ZDV)
Anselm-Franz-von-Bentzel-Weg 12
55128 Mainz
Germany
E-Mail: g...@uni-mainz.de
Office Phone: +49-6131-39-26437
________________________________________
From: Gene Cooperman <g...@ccs.neu.edu>
Sent: Wednesday, March 18, 2015 6:54 PM
To: Gad, Ramy
Cc: dmtcp-forum@lists.sourceforge.net
Subject: Re: [Dmtcp-forum] How similar is DMTCP checkpoint file to a process
core memory dump ?
Hi Ramy,
DMTCP is very similar to a process core memory dumps, but it
uses its own internal format, with certain enhancements. It includes:
1) a header section
2) a header for each contiguous memory area (addr range, permissions, etc.)
3) the data for each contiguous memory area
A memory area with zero pages is saved specially to save space.
If you want to look at a DMTCP ckpt image, do:
gzip -dc ckpt_*.dmtcp > tmp.dmtcp
<DMTCP_DIR>/util/readdmtcp.sh tmp.dmtcp
You'll see that DMTCP also saves the memory of all resident libraries.
In particular, the DMTCP libraries (plugins) will save additional state
in their memory, for the kernel state, state of the network, data in
flight in sockets, etc.
Best,
- Gene
On Wed, Mar 18, 2015 at 03:45:16PM +0000, Gad, Ramy wrote:
> Hi all,
>
>
> How similar is DMTCP checkpoint file to a process core memory dump ?
>
>
> What are the common info and what are the differences ?
>
>
> Best regards,
>
> Ramy Gad
> Johannes Gutenberg - Universität Mainz
> Zentrums für Datenverarbeitung (ZDV)
>
> Anselm-Franz-von-Bentzel-Weg 12
> 55128 Mainz
> Germany
> E-Mail: g...@uni-mainz.de<mailto:g...@uni-mainz.de>
> Office Phone: +49-6131-39-26437
>
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