Running UPC jobs on C4

There are two main methods to run UPC jobs on C4

1. Compile in purely multi-threaded mode (network=smp)
2. Compile with UDP across nodes (network=udp)

For the first option, compile with the options

upcc -network=smp -pthreads

and run as a normal HTCondor submission. In the second case, the simplest approach is to use the upcsub script, which is exactly analogous to mpisub; see also the documentation on using MPI on C4. The error, output, and log files are saved as upcsub-XXXX-X.*.

There are other options as well, such as mixing UDP for cross-node communication with threads for in-node communication. The Makefile in the basic/upc subdirectory gives an example of how to do this.

Note that whether you use the SMP mode or the UDP mode, you will need to have the UPC module loaded both for compilation and for running the program.