[Darshan-users] Darshan-users Digest, Vol 64, Issue 3

[Jean Bez]

Hi,


> Are you actually performing any read or write operations to a file in
>
the application you are linking with Darshan? DXT only traces reads and
> writes, so if you are just opening a file (for instance), it shouldn't
> produce any DXT data.
>

Yes, but after looking at the application I was testing it used some
functions (fwrite for instance) that were not traced by Darshan DxT,
although they appeared on the default Darshan report. So I looked at the
souce-code and those calls is not handled yet.

If your application is doing reads/writes, there should be DXT data if
> you enabled it properly. Did you run 'export DXT_ENABLE_IO_TRACE='? Note
> that you need to include the trailing equal sign, even if you aren't
> setting a value for the amount of memory to use. For example:


> 'export DXT_ENABLE_IO_TRACE=' will give you the default 4MiB buffer per
> process for tracing
> 'export DXT_ENABLE_IO_TRACE=8' will instead allocate 8MiB buffers per
> process
>

Yes, I set the variable via the MPICH -env option and now it worked ok for
the MPI-IO requests.

Thanks!
Jean


>
> Thanks,
> --Shane
>
> On 02/13/2017 11:03 AM, Jean Bez wrote:
> > Hi!
> >
> > I was just trying to use the new DXT module and although I have set
> > the environment variable (DXT_ENABLE_IO_TRACE) to activate it, when I
> > attempt to parse the .darshan file with the darshan-dxt-parser I
> > always get the message:
> >
> > "no DXT module data available for this Darshan log."
> >
> > Is there something else we need to do to enable DXT?
> >
> > Thanks!
> >
> > Best regards,
> > Jean
> >
> >
> > _______________________________________________
> > Darshan-users mailing list
> > Darshan-users at lists.mcs.anl.gov
> > https://lists.mcs.anl.gov/mailman/listinfo/darshan-users
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