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

[Phil Carns]

On 02/14/2017 03:18 PM, Jean Bez wrote:
> 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.
>

Hi Jean,

Is this a feature that you would be interested in?  If so, you can add a 
feature request on gitlab 
https://xgitlab.cels.anl.gov/darshan/darshan/issues (you will probably 
need to sign up for an account first) to have the dxt module include 
stdio functions, to make sure we don't lose track of the idea.

thanks,
-Phil

>     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
>     >
>     >
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