Merge branch 'gpu_guest' into 'master'

Add section on GPU guest jobs.

See merge request !160

content/guides/submitting_jobs/submitting_cuda_or_openacc_jobs.md

@@ -94,3 +94,19 @@ module load cuda/8.0 compiler/pgi/16
 ./acc-app.exe
 {{< /highlight >}}
 {{% /panel %}}
+
+### Submitting Pre-emptable Jobs
+
+Some GPU hardware is reserved by various groups for priority access.  While the group that has
+purchased the priority access will always have immediate access, HCC makes these nodes
+available opportunistically.  When not otherwise utilized, **jobs can run on these resources with the
+limitation that they may be pre-empted (i.e. killed) at any time**.
+
+To submit jobs to these resources, add the following to your srun or sbatch command:
+
+{{< highlight batch >}}
+--partition=guest_gpu --gres=gpu
+{{< /highlight >}}
+
+**In order to properly utilize pre-emptable resources, your job must be able to support
+some type of checkpoint/resume functionality.**