PGI User Forum

Mark Abene · Joined: 05 Oct 2009 Posts: 4

We're using PGI 10.5 on Ubuntu Linux 10.04. According to the PGI Tools Guide, Release 2010, the proper method for profiling CUDA Fortran programs is to run pgcollect with the "-cuda" option. However, our pgcollect doesn't seem to have any such option, but instead gives the following error:

pgcollect-Error-Unknown switch: -cuda

There is no mention of a "-cuda" option in the pgcollect man page, and I'm unable to see any detailed accelerator time stats in the "accelerator performance" tab in pgprof. The program in question has been compiled with the "-ta=nvidia" (and has a .cuf suffix, same as doing -Mcuda).

Please advise the proper way to do this, and why the documentation doesn't reflect reality. :)

Thanks,
Mark

mkcolg · Posted: Wed Jul 14, 2010 4:47 pm Post subject:

Hi Mark,

The '-cuda' option for pgcollect is new in version 10.6. You will need to update your version.

Thanks,
Mat

Mark Abene · Joined: 05 Oct 2009 Posts: 4

Elementary! So we upgraded to 10.6. We have all the new options to pgcollect now, however I still don't get anything other than "seconds" as a measured metric in pgprof no matter what "-cuda=" options I specify for pgcollect. This is a CUDA Fortran program I'm trying to benchmark on an Nvidia Tesla. Program was compiled with "-ta=nvidia". Please advise.

-Mark

mkcolg · Posted: Thu Jul 15, 2010 4:25 pm Post subject:

Hi Mark,

pgcollect currently only supports CUDA Fortran programs. "-ta" is for the PGI Accelerator model. So I think if you compile without "-ta" you should get the expected NVIDIA GPU hardware counter information in the bottom panel of pgprof.

If this isn't it,then I'll ask one of our Tools engineers to step in and help.

- Mat

Mark Abene · Joined: 05 Oct 2009 Posts: 4

I should be more specific. I'm not seeing GPU usage benchmarks in pgprof when doing some testing with !$acc pragmas in Fortran. But let me get back to you on that.

Initial problem was that "pgcollect" looks in the wrong directory for its default config files. It looks here:

/opt/pgi/linux86-64/10.6/cuda/pgprof

...which doesn't exist. This directory appears to be compiled into pgcollect. It *should* be looking here:

/opt/pgi/linux86-64/10.6/etc/pgprof

Creating a "cuda" directory in /opt/pgi/linux86-64/10.6 and symlinking the above directory to "cuda/pgprof" fixes that problem.

-Mark