[Darshan-users] Enable DXT

Shane Snyder ssnyder at mcs.anl.gov
Mon Feb 13 13:14:02 CST 2017

Hi Jean,

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.

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 


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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