The invalid (unmapped) pages are not saved as part of the ckpt image. Only
valid mapped memory pages are saved. Hope that helps.
Kapil
On Fri, Feb 13, 2015 at 11:54 AM, Gad, Ramy <g...@uni-mainz.de> wrote:
> Hi,
>
>
> I am trying to apply data deduplication on DMTCP checkpoint process
> images for mpi applications (mainly the the "*ckpt_*.dmtcp" files*).
>
> I generate raw images (i.e. without compression by adding "--no-gzip" to
> dmtcp_launch)
>
>
> Each "*ckpt_*.dmtcp"* file contain the memory pages heap, stack and code
> region allocated by a process.
>
>
> My question is :
>
>
> Does DMTCP tries to fill the gabs between valid memory pages by adding
> zeros in between ?
>
> This can be done in order to have a continues address space.
>
>
> I can say the question in a different way
>
>
> Are invalid memory pages are filled with zeros and saved inside the "
> *ckpt_*.dmtcp"* file ?
>
>
>
> I will be glad to answer my question and /or provide me to a link to a
> publication that can answer this question.
>
>
> Looking forward 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
>
>
>
> ------------------------------------------------------------------------------
> Dive into the World of Parallel Programming. The Go Parallel Website,
> sponsored by Intel and developed in partnership with Slashdot Media, is
> your
> hub for all things parallel software development, from weekly thought
> leadership blogs to news, videos, case studies, tutorials and more. Take a
> look and join the conversation now. http://goparallel.sourceforge.net/
> _______________________________________________
> Dmtcp-forum mailing list
> Dmtcp-forum@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/dmtcp-forum
>
>
------------------------------------------------------------------------------
Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
from Actuate! Instantly Supercharge Your Business Reports and Dashboards
with Interactivity, Sharing, Native Excel Exports, App Integration & more
Get technology previously reserved for billion-dollar corporations, FREE
http://pubads.g.doubleclick.net/gampad/clk?id=190641631&iu=/4140/ostg.clktrk
_______________________________________________
Dmtcp-forum mailing list
Dmtcp-forum@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/dmtcp-forum
