[Darshan-users] Darshan I/O profiling of sequential code

[Phil Carns]

Hi Wadud,

For most (but not all) MPI implementations you wouldn't even need to use 
mpirun.  You can just launch the program like you normally would with 
./app.exe and the MPI library will assume that it is operating in a 
single-process environment.

-Phil

On 12/14/2016 11:02 AM, Wadud Miah wrote:
>
> Hi Shane,
>
> Thanks for the quick reply. I will probably just enclose the 
> sequential code using MPI_INIT() and MPI_FINALIZE() and execute it 
> using mpirun -n 1 ./app.exe. Do you think that will work?
>
> Regards,
>
> Wadud.
>
> *From:*Shane Snyder [mailto:ssnyder at mcs.anl.gov]
> *Sent:* 14 December 2016 15:57
> *To:* Wadud Miah <wadud.miah at nag.co.uk>; darshan-users at lists.mcs.anl.gov
> *Subject:* Re: [Darshan-users] Darshan I/O profiling of sequential code
>
> Hi Wadud,
>
> Right now, Darshan can only instrument MPI applications. It intercepts 
> MPI_Init and MPI_Finalize to initialize itself and to produce the 
> output log file, respectively. It also uses MPI communication and I/O 
> operations at shutdown time to aggregate data across all processes and 
> write to the log file. Breaking the MPI dependencies isn't exactly 
> straightforward, but we have at least been thinking about how to 
> extend Darshan to non-MPI codes. Recent changes to the architecture 
> have been a step in the right direction but there's still work to do 
> to get us all the way there.
>
> We will continue to think about this and will certainly keep the 
> mailing list updated with any progress we make.
>
> Thanks,
> --Shane
>
> On 12/14/2016 09:35 AM, Wadud Miah wrote:
>
>     Hello,
>
>     I have built Darshan using Intel MPI (2017) and would like to
>     profile a sequential code using Darshan. I have used the same
>     Darshan library to profile an MPI code it works fine. I execute
>     the following command line for a sequential code :
>
>     $ export DARSHAN_LOGPATH=.
>
>     $
>     LD_PRELOAD=/home/pr1ebt00/pr1ebt05/darshan-3.1.2-impi/lib/libdarshan.so
>     ~/gbmoldd/utilities/joinfiles.exe
>
>     but it doesn’t create any Darshan output file. Do you know if I
>     can profile sequential codes using Darshan? If so, how can I do this?
>
>     Best regards,
>
>     Wadud.
>
>     -----------------------------------
>
>     Dr. Wadud Miah
>
>     Computational Scientist
>
>     Numerical Algorithms Group
>
>     01865 518035
>
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