UPC

Unified Parallel C (UPC) is an extension of the C programming language designed for high performance computing on large-scale parallel machines.The language provides a uniform programming model for both shared and distributed memory hardware. The programmer is presented with a single shared, partitioned address space, where variables may be directly read and written by any processor, but each variable is physically associated with a single processor. UPC uses a Single Program Multiple Data (SPMD) model of computation in which the amount of parallelism is fixed at program startup time, typically with a single thread of execution per processor.

Installed on blacklight and salk.

Blacklight version

SGI UPC is installed on blacklight.

To use UPC:

1. Load the UPC module.

   module load sgi-upc-devel

2. Compile your code with sgiupc

   sgiupc prog.c -o prog

3. Create a batch job to do the following things:
   1. Set up the module command.
   2. Load the UPC module

      module load sgi-upc-devel

   3. Run the job with mpirun

      mpirun -np $PBS_NCPUS ./prog

4. Submit the job with the qsub command. See the qsub documentation on blacklight for more information.

Also see the example job.

Salk version

The version installed is Berkeley Unified Parallel C compiler 2.6.0.

The upcc executables are in /usr/local/packages/bupc-2.6.0/bin.

The number of threads can be specified at compilation or at run time.

At compilation:

/usr/local/packages/bupc-2.6.0/bin/upcc -pthreads=2 prog.upc
/usr/local/packages/bupc-2.6.0/bin/upcrun prog 

At run time:

/usr/local/packages/bupc-2.6.0/bin/upcc -pthreads prog.upc
/usr/local/packages/bupc-2.6.0/bin/upcrun -n 2 prog

Also see the example job.

See also

• The UPC website at LBNL, which includes a description of UPC, user documentation, and demos, among other things.
• Other installed at PSC.
• Other installed at PSC.